The Info List - Animal

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ANIMALS are multicellular , eukaryotic organisms of the kingdom ANIMALIA (also called METAZOA). The animal kingdom emerged as a clade within Apoikozoa as the sister group to the choanoflagellates . Animals are motile , meaning they can move spontaneously and independently at some point in their lives. Their body plan eventually becomes fixed as they develop , although some undergo a process of metamorphosis later in their lives. All animals are heterotrophs : they must ingest other organisms or their products for sustenance .

Most known animal phyla appeared in the fossil record as marine species during the Cambrian explosion , about 542 million years ago. Animals can be divided broadly into vertebrates and invertebrates . Vertebrates have a backbone or spine (vertebral column ), and amount to less than five percent of all described animal species . They include fish , amphibians , reptiles , birds and mammals . The remaining animals are the invertebrates, which lack a backbone. These include molluscs (clams , oysters , octopuses , squid , snails ); arthropods (millipedes , centipedes , insects , spiders , scorpions , crabs , lobsters , shrimp ); annelids (earthworms , leeches ), nematodes (filarial worms , hookworms ), flatworms (tapeworms , liver flukes ), cnidarians (jellyfish , sea anemones , corals ), ctenophores (comb jellies), and sponges . The study of animals is called zoology .


* 1 Etymology * 2 History of classification

* 3 Characteristics

* 3.1 Structure * 3.2 Reproduction and development * 3.3 Inbreeding avoidance * 3.4 Food and energy sourcing

* 4 Origin and fossil record

* 5 Groups of animals

* 5.1 Non-bilaterian animals: Porifera, Placozoa, Ctenophora, Cnidaria

* 5.2 Bilaterian animals

* 5.2.1 Deuterostomes and protostomes * 5.2.2 Ecdysozoa * 5.2.3 Lophotrochozoa

* 6 Number of extant species * 7 Model organisms * 8 See also * 9 References * 10 Bibliography * 11 External links


The word "animal" comes from the Latin _animalis_, meaning _having breath_, _having soul_ or _living being_. In everyday non-scientific usage the word excludes humans – that is, "animal" is often used to refer only to non-human members of the kingdom Animalia; often, only closer relatives of humans such as mammals and other vertebrates, are meant. The biological definition of the word refers to all members of the kingdom Animalia, encompassing creatures as diverse as sponges , jellyfish , insects , and humans .


Main articles: History of zoology (through 1859) and History of zoology since 1859 Carl Linnaeus is known as the father of modern taxonomy .

Aristotle divided the living world between animals and plants , and this was followed by Carl Linnaeus , in the first hierarchical classification. In Linnaeus's original scheme, the animals were one of three kingdoms, divided into the classes of Vermes , Insecta , Pisces , Amphibia , Aves , and Mammalia . Since then the last four have all been subsumed into a single phylum, the Chordata , whereas the various other forms have been separated out.

In 1874, Ernst Haeckel divided the animal kingdom into two subkingdoms: Metazoa (multicellular animals) and Protozoa (single-celled animals). The protozoa were later moved to the kingdom Protista , leaving only the metazoa. Thus Metazoa is now considered a synonym of Animalia.


Animals have several characteristics that set them apart from other living things. Animals are eukaryotic and multicellular , which separates them from bacteria and most protists . They are heterotrophic , generally digesting food in an internal chamber, which separates them from plants and algae . They are also distinguished from plants, algae, and fungi by lacking rigid cell walls . All animals are motile , if only at certain life stages. In most animals, embryos pass through a blastula stage , which is a characteristic exclusive to animals.


With a few exceptions, most notably the sponges ( Phylum Porifera) and Placozoa , animals have bodies differentiated into separate tissues . These include muscles , which are able to contract and control locomotion, and nerve tissues , which send and process signals. Typically, there is also an internal digestive chamber, with one or two openings. Animals with this sort of organization are called metazoans, or eumetazoans when the former is used for animals in general.

All animals have eukaryotic cells, surrounded by a characteristic extracellular matrix composed of collagen and elastic glycoproteins . This may be calcified to form structures like shells , bones , and spicules . During development, it forms a relatively flexible framework upon which cells can move about and be reorganized, making complex structures possible. In contrast, other multicellular organisms , like plants and fungi, have cells held in place by cell walls, and so develop by progressive growth. Also, unique to animal cells are the following intercellular junctions: tight junctions , gap junctions , and desmosomes .


See also: Sexual reproduction § Animals , and Asexual reproduction § Examples in animals Some species of land snails use love darts as a form of sexual selection

Nearly all animals undergo some form of sexual reproduction . They produce haploid gametes by meiosis (see Origin and function of meiosis ). The smaller, motile gametes are spermatozoa and the larger, non-motile gametes are ova . These fuse to form zygotes , which develop into new individuals (see Allogamy ).

Many animals are also capable of asexual reproduction . This may take place through parthenogenesis , where fertile eggs are produced without mating, budding, or fragmentation .

A zygote initially develops into a hollow sphere, called a blastula , which undergoes rearrangement and differentiation. In sponges, blastula larvae swim to a new location and develop into a new sponge. In most other groups, the blastula undergoes more complicated rearrangement. It first invaginates to form a gastrula with a digestive chamber, and two separate germ layers —an external ectoderm and an internal endoderm . In most cases, a mesoderm also develops between them. These germ layers then differentiate to form tissues and organs.


In Gombe Stream National Park, male chimpanzees remain in their natal community while females disperse to other groups

During sexual reproduction , mating with a close relative (inbreeding ) generally leads to inbreeding depression . For instance, inbreeding was found to increase juvenile mortality in 11 small animal species. Inbreeding depression is considered to be largely due to expression of deleterious recessive mutations . Mating with unrelated or distantly related members of the same species is generally thought to provide the advantage of masking deleterious recessive mutations in progeny. (see Heterosis ). Animals have evolved numerous diverse mechanisms for avoiding close inbreeding and promoting outcrossing (see Inbreeding avoidance ).

As indicated in the image of chimpanzees, they have adopted dispersal as a way to separate close relatives and prevent inbreeding. Their dispersal route is known as natal dispersal, whereby individuals move away from the area of birth. DNA analysis has shown that 60% of offspring in splendid fairywrens nests were sired through extra-pair copulations, rather than from resident males.

In various species, such as the splendid fairywren , females benefit by mating with multiple males, thus producing more offspring of higher genetic quality. Females that are pair bonded to a male of poor genetic quality, as is the case in inbreeding, are more likely to engage in extra-pair copulations in order to improve their reproductive success and the survivability of their offspring.


Main article: Animal nutrition A newt lung cell stained with fluorescent dyes undergoing the early anaphase stage of mitosis

All animals are heterotrophs , meaning that they feed directly or indirectly on other living things. They are often further subdivided into groups such as carnivores , herbivores , omnivores , and parasites .

Predation is a biological interaction where a predator (a heterotroph that is hunting) feeds on its prey (the organism that is attacked). Predators may or may not kill their prey prior to feeding on them, but the act of predation almost always results in the death of the prey. The other main category of consumption is detritivory , the consumption of dead organic matter . It can at times be difficult to separate the two feeding behaviours , for example, where parasitic species prey on a host organism and then lay their eggs on it for their offspring to feed on its decaying corpse. Selective pressures imposed on one another has led to an evolutionary arms race between prey and predator, resulting in various antipredator adaptations .

Most animals indirectly use the energy of sunlight by eating plants or plant-eating animals. Most plants use light to convert inorganic molecules in their environment into carbohydrates , fats , proteins and other biomolecules, characteristically containing reduced carbon in the form of carbon-hydrogen bonds. Starting with carbon dioxide (CO2) and water (H2O), photosynthesis converts the energy of sunlight into chemical energy in the form of simple sugars (e.g., glucose ), with the release of molecular oxygen . These sugars are then used as the building blocks for plant growth, including the production of other biomolecules. When an animal eats plants (or eats other animals which have eaten plants), the reduced carbon compounds in the food become a source of energy and building materials for the animal. They are either used directly to help the animal grow, or broken down, releasing stored solar energy, and giving the animal the energy required for motion.

Animals living close to hydrothermal vents and cold seeps on the ocean floor are not dependent on the energy of sunlight. Instead chemosynthetic archaea and bacteria form the base of the food chain .


Life timeline view • discuss • edit -4500 — – -4000 — – -3500 — – -3000 — – -2500 — – -2000 — – -1500 — – -1000 — – -500 — – 0 — _WATER _ Single-celled life _PHOTOSYNTHESIS _ EUKARYOTES Multicellular life LAND LIFE DINOSAURS MAMMALS FLOWERS ← Earliest Earth (−4540 ) ← Earliest water ← Earliest life ← LHB meteorites ← Earliest oxygen ← Atmospheric oxygen ← Oxygen crisis ← Earliest sexual reproduction ← Ediacara biota ← Cambrian explosion ← Earliest humans P h a n e r o z o i c

P r o t e r o z o i c

A r c h e a n H a d e a n Pongola Huronian Cryogenian Andean Karoo Quaternary Axis scale : millions of years . Orange labels: known _ICE AGES_. Also see: _ Human timeline _ and _ Nature timeline _ Further information: Urmetazoan _ Dunkleosteus _ was a 10-metre-long (33 ft) prehistoric fish .

Animals are generally considered to have emerged within flagellated eukaryota. Their closest known living relatives are the choanoflagellates , collared flagellates that have a morphology similar to the choanocytes of certain sponges. Molecular studies place animals in a supergroup called the opisthokonts , which also include the choanoflagellates, fungi and a few small parasitic protists . The name comes from the posterior location of the flagellum in motile cells, such as most animal spermatozoa, whereas other eukaryotes tend to have anterior flagella.

The first fossils that might represent animals appear in the Trezona Formation at Trezona Bore, West Central Flinders, South Australia . These fossils are interpreted as being early sponges. They were found in 665-million-year-old rock.

The next oldest possible animal fossils are found towards the end of the Precambrian , around 610 million years ago, and are known as the Ediacaran or Vendian biota . These are difficult to relate to later fossils, however. Some may represent precursors of modern phyla, but they may be separate groups, and it is possible they are not really animals at all.

Aside from them, most known animal phyla make a more or less simultaneous appearance during the Cambrian period, about 542 million years ago. It is still disputed whether this event, called the Cambrian explosion , is due to a rapid divergence between different groups or due to a change in conditions that made fossilization possible.

Some palaeontologists suggest that animals appeared much earlier than the Cambrian explosion, possibly as early as 1 billion years ago. Trace fossils such as tracks and burrows found in the Tonian period indicate the presence of triploblastic worms, like metazoans, roughly as large (about 5 mm wide) and complex as earthworms . During the beginning of the Tonian period around 1 billion years ago, there was a decrease in Stromatolite diversity, which may indicate the appearance of grazing animals, since stromatolite diversity increased when grazing animals became extinct at the End Permian and End Ordovician extinction events, and decreased shortly after the grazer populations recovered. However the discovery that tracks very similar to these early trace fossils are produced today by the giant single-celled protist _ Gromia sphaerica _ casts doubt on their interpretation as evidence of early animal evolution.


Main article: Lists of animals

Traditional morphological and modern molecular phylogenetic analysis have both recognized a major evolutionary transition from "non-bilaterian" animals, which are those lacking a bilaterally symmetric body plan ( Porifera , Ctenophora , Cnidaria and Placozoa ), to "bilaterian" animals ( Bilateria ) whose body plans display bilateral symmetry. The latter are further classified based on a major division between Deuterostomes and Protostomes . The relationships among non-bilaterian animals are disputed, but all bilaterian animals are thought to form a monophyletic group. In a study of basal animals, the porifera were found to be basalmost, although they could still be paraphyletic, resulting in the following cladogram:














Some studies place Ctenophora as basalmost.


Several animal phyla are recognized for their lack of bilateral symmetry , and are thought to have diverged from other animals early in evolution. Among these, the sponges ( Porifera ) were long thought to have diverged first, representing the oldest animal phylum. They lack the complex organization found in most other phyla. Their cells are differentiated, but in most cases not organized into distinct tissues. Sponges typically feed by drawing in water through pores. However, a series of phylogenomic studies from 2008–2015 have found support for Ctenophora , or comb jellies, as the basal lineage of animals. This result has been controversial, since it would imply that sponges may not be so primitive, but may instead be secondarily simplified. Other researchers have argued that the placement of Ctenophora as the earliest-diverging animal phylum is a statistical anomaly caused by the high rate of evolution in ctenophore genomes.

Among the other phyla, the Ctenophora and the Cnidaria , which includes sea anemones , corals , and jellyfish , are radially symmetric and have digestive chambers with a single opening, which serves as both the mouth and the anus. Both have distinct tissues, but they are not organized into organs . There are only two main germ layers, the ectoderm and endoderm, with only scattered cells between them. As such, these animals are sometimes called diploblastic . The tiny placozoans are similar, but they do not have a permanent digestive chamber.

The Myxozoa , microscopic parasites that were originally considered Protozoa, are now believed to have evolved within Cnidaria. _ Orange elephant ear sponge, Agelas clathrodes _, in foreground. Two corals in the background: a sea fan , _ Iciligorgia schrammi _, and a sea rod, _ Plexaurella nutans _.


The remaining animals form a monophyletic group called the Bilateria . For the most part, they are bilaterally symmetric , and often have a specialized head with feeding and sensory organs. The body is triploblastic , i.e. all three germ layers are well-developed, and tissues form distinct organs. The digestive chamber has two openings, a mouth and an anus, and there is also an internal body cavity called a coelom or pseudocoelom. There are exceptions to each of these characteristics, however—for instance adult echinoderms are radially symmetric, and certain parasitic worms have extremely simplified body structures.

Genetic studies have considerably changed our understanding of the relationships within the Bilateria. Most appear to belong to two major lineages: the deuterostomes and the protostomes , the latter of which includes the Ecdysozoa , and Lophotrochozoa . The Chaetognatha or arrow worms have been traditionally classified as deuterostomes, though recent molecular studies have identified this group as a basal protostome lineage.

In addition, there are a few small groups of bilaterians with relatively cryptic morphology whose relationships with other animals are not well-established. For example, recent molecular studies have identified Acoelomorpha and _ Xenoturbella _ as comprising a monophyletic group, but studies disagree as to whether this group evolved from within deuterostomes, or whether it represents the sister group to all other bilaterian animals ( Nephrozoa ). Other groups of uncertain affinity include the Rhombozoa and Orthonectida . One phyla, the Monoblastozoa , was described by a scientist in 1892, but so far there have been no evidence of its existence.

Deuterostomes And Protostomes

_ Superb fairy-wren , Malurus cyaneus_

Deuterostomes differ from protostomes in several ways. Animals from both groups possess a complete digestive tract. However, in protostomes, the first opening of the gut to appear in embryological development (the archenteron ) develops into the mouth, with the anus forming secondarily. In deuterostomes the anus forms first, with the mouth developing secondarily. In most protostomes, cells simply fill in the interior of the gastrula to form the mesoderm, called schizocoelous development, but in deuterostomes, it forms through invagination of the endoderm, called enterocoelic pouching. Deuterostome embryos undergo radial cleavage during cell division, while protostomes undergo spiral cleavage.

All this suggests the deuterostomes and protostomes are separate, monophyletic lineages. The main phyla of deuterostomes are the Echinodermata and Chordata . The former are radially symmetric and exclusively marine, such as starfish , sea urchins , and sea cucumbers . The latter are dominated by the vertebrates, animals with backbones. These include fish, amphibians, reptiles, birds, and mammals.

In addition to these, the deuterostomes also include the Hemichordata , or acorn worms, which are thought to be closely related to Echinodermata forming a group known as Ambulacraria . Although they are not especially prominent today, the important fossil graptolites may belong to this group.


_ Yellow-winged darter , Sympetrum flaveolum_

The Ecdysozoa are protostomes, named after the common trait of growth by moulting or ecdysis . The largest animal phylum belongs here, the Arthropoda , including insects, spiders, crabs, and their kin. All these organisms have a body divided into repeating segments, typically with paired appendages. Two smaller phyla, the Onychophora and Tardigrada , are close relatives of the arthropods and share these traits. The ecdysozoans also include the Nematoda or roundworms, perhaps the second largest animal phylum. Roundworms are typically microscopic, and occur in nearly every environment where there is water. A number are important parasites. Smaller phyla related to them are the Nematomorpha or horsehair worms, and the Kinorhyncha , Priapulida , and Loricifera . These groups have a reduced coelom, called a pseudocoelom. _ Roman snail , Helix pomatia_


The Lophotrochozoa , evolved within Protostomia, include two of the most successful animal phyla, the Mollusca and Annelida . The former, which is the second-largest animal phylum by number of described species, includes animals such as snails , clams , and squids , and the latter comprises the segmented worms, such as earthworms and leeches . These two groups have long been considered close relatives because of the common presence of trochophore larvae, but the annelids were considered closer to the arthropods because they are both segmented. Now, this is generally considered convergent evolution , owing to many morphological and genetic differences between the two phyla. Lophotrochozoa also includes the Nemertea or ribbon worms, the Sipuncula , and several phyla that have a ring of ciliated tentacles around the mouth, called a lophophore . These were traditionally grouped together as the lophophorates. but it now appears that the lophophorate group may be paraphyletic , with some closer to the nemerteans and some to the molluscs and annelids. They include the Brachiopoda or lamp shells, which are prominent in the fossil record, the Entoprocta , the Phoronida , and possibly the Bryozoa or moss animals.

The Platyzoa include the phylum Platyhelminthes , the flatworms. These were originally considered some of the most primitive Bilateria, but it now appears they developed from more complex ancestors. A number of parasites are included in this group, such as the flukes and tapeworms . Flatworms are acoelomates , lacking a body cavity, as are their closest relatives, the microscopic Gastrotricha . The other platyzoan phyla are mostly microscopic and pseudocoelomate . The most prominent are the Rotifera or rotifers, which are common in aqueous environments. They also include the Acanthocephala or spiny-headed worms, the Gnathostomulida , Micrognathozoa , and possibly the Cycliophora . These groups share the presence of complex jaws, from which they are called the Gnathifera .

A relationship between the Brachiopoda and Nemertea has been suggested by molecular data. A second study has also suggested this relationship. This latter study also suggested that Annelida and Mollusca may be sister clades. Another study has suggested that Annelida and Mollusca are sister clades. This clade has been termed the Neotrochozoa .


Animals can be divided into two broad groups: vertebrates (animals with a backbone ) and invertebrates (animals without a backbone). Half of all described vertebrate species are fishes and three-quarters of all described invertebrate species are insects. The following table lists the number of described extant species for each major animal subgroup as estimated for the IUCN Red List of Threatened Species _, 2014.3. _ The relative number of species contributed to the total by each phylum of animals

GROUP IMAGE SUBGROUP Estimated number of described species


Fishes 32,900

Amphibians 7,302

Reptiles 10,038

Birds 10,425

Mammals 5,513

Total vertebrate species: 66,178


Insects 1,000,000

Molluscs 85,000

Crustaceans 47,000

Corals 2,000

Arachnids 102,248

Velvet worms 165

Horseshoe crabs 4

Others 68,658

Total invertebrate species: 1,305,075


Over 95% of the described animal species in the world are invertebrates.


Main articles: Model organism and Animal testing

Because of the great diversity found in animals, it is more economical for scientists to study a small number of chosen species so that connections can be drawn from their work and conclusions extrapolated about how animals function in general. Because they are easy to keep and breed, the fruit fly _ Drosophila melanogaster _ and the nematode _ Caenorhabditis elegans _ have long been the most intensively studied metazoan model organisms , and were among the first life-forms to be genetically sequenced. This was facilitated by the severely reduced state of their genomes , but as many genes , introns , and linkages lost, these ecdysozoans can teach us little about the origins of animals in general. The extent of this type of evolution within the superphylum will be revealed by the crustacean, annelid, and molluscan genome projects currently in progress. Analysis of the starlet sea anemone genome has emphasized the importance of sponges, placozoans, and choanoflagellates , also being sequenced, in explaining the arrival of 1500 ancestral genes unique to the Eumetazoa.

An analysis of the homoscleromorph sponge _ Oscarella carmela _ also suggests that the last common ancestor of sponges and the eumetazoan animals was more complex than previously assumed.

Other model organisms belonging to the animal kingdom include the house mouse (_ Mus musculus _), laboratory rat (_ Rattus norvegicus _) and zebrafish (_ Danio rerio _).


* Book: Animal

* Animal attacks * Animal coloration * Ethology * Fauna * List of animal names * Lists of animals * Lists of organisms by population * Taxonomy (biology)


* ^ Harzsch, S.; Müller, C. H. (18 May 2007). "A new look at the ventral nerve centre of _Sagitta_: implications for the phylogenetic position of Chaetognatha (arrow worms) and the evolution of the bilaterian nervous system" . _Frontiers in Zoology_. 4: 14. PMC 1885248  _. PMID 17511857 . doi :10.1186/1742-9994-4-14 . * ^ Annelid phylogeny and status of Sipuncula and Echiura * ^ Cresswell, Julia (2010). The Oxford Dictionary of Word Origins_ (2nd ed.). New York: Oxford University Press. ISBN 978-0-19-954793-7 . 'having the breath of life', from anima 'air, breath, life' . * ^ "Animals". Merriam-Webster\'s . Retrieved 16 May 2010. 2 a : one of the lower animals as distinguished from human beings b : mammal; _broadly_ : vertebrate * ^ "Animal". _The American Heritage Dictionary_ (4th ed.). Houghton Mifflin Company. 2006. * ^ Calisher, CH (2007). "Taxonomy: what\'s in a name? Doesn\'t a rose by any other name smell as sweet?" . _Croatian Medical Journal_. 48 (2): 268–270. PMC 2080517  _. PMID 17436393 . * ^ Linnaeus, Carl (1758). Systema naturae per regna tria naturae :secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis._ (in Latin) (10th ed.). Holmiae (Laurentii Salvii). Archived from the original on 10 October 2008. Retrieved 22 September 2008. * ^ Haeckel, Ernst (1874). _Anthropogenie oder Entwickelungsgeschichte des menschen_ (in German). Leipzig. p. 202. * ^ Hutchins 2003 , p. 3 * ^ "Panda Classroom". Archived from the original on 29 September 2007. Retrieved 30 September 2007. * ^ Bergman, Jennifer. "Heterotrophs". Archived from the original on 29 August 2007. Retrieved 30 September 2007. * ^ Douglas, Angela E.; Raven, John A. (January 2003). "Genomes at the interface between bacteria and organelles" . _Philosophical Transactions of the Royal Society B_. 358 (1429): 5–17; discussion 517–8. PMC 1693093  _. PMID 12594915 . doi :10.1098/rstb.2002.1188 . * ^ Davidson, Michael W. " Animal Cell Structure". Archived from the original on 20 September 2007. Retrieved 20 September 2007. * ^ Saupe, S. G. "Concepts of Biology". Retrieved 30 September 2007. * ^ Minkoff, Eli C. (2008). Barron's EZ-101 Study Keys Series: Biology_ (2nd, revised ed.). Barron's Educational Series. p. 48. ISBN 978-0-7641-3920-8 . * ^ _A_ _B_ _C_ Adam-Carr, Christine; Hayhoe, Christy; Hayhoe, Douglas; Hayhoe, Katharine (2010). _Science Perspectives 10_. Nelson Education Ltd. ISBN 978-0-17-635528-9 . * ^ Hillmer, Gero; Lehmann, Ulrich (1983). _Fossil Invertebrates_. Translated by J. Lettau. CUP Archive. p. 54. ISBN 978-0-521-27028-1 . ISSN 0266-3236 . Retrieved 2015-03-23. * ^ Alberts, Bruce; Johnson, Alexander; Lewis, Julian; Raff, Martin; Roberts, Keith; Walter, Peter (2002). _ Molecular Biology of the Cell_ (4th ed.). New York: Garland Science. Retrieved 2015-03-23. * ^ Sangwal 2007 , p. 212 * ^ Becker, Wayne M. (1991). _The world of the cell_. Benjamin/Cummings. ISBN 978-0-8053-0870-9 . * ^ Magloire 2004 , p. 45 * ^ Koene, J. M. (2006). "Tales of two snails: sexual selection and sexual conflict in _Lymnaea stagnalis_ and _Helix aspersa_". _Integrative and Comparative Biology_. 46 (4): 419–429. PMID 21672754 . doi :10.1093/icb/icj040 . * ^ Knobil, Ernst (1998). _Encyclopedia of reproduction, Volume 1_. Academic Press. p. 315. ISBN 978-0-12-227020-8 . * ^ Schwartz, Jill (2010). _Master the GED 2011 (w/CD)_. Peterson's. p. 371. ISBN 978-0-7689-2885-3 . * ^ Hamilton, Matthew B. (2009). _Population genetics_. Wiley-Blackwell. p. 55. ISBN 978-1-4051-3277-0 . * ^ Adiyodi, K. G.; Hughes, Roger N.; Adiyodi, Rita G. (July 2002). _Reproductive Biology of Invertebrates, Volume 11, Progress in Asexual Reproduction_. Wiley. p. 116. * ^ Kaplan (2008). _GRE exam subject test_. Kaplan Publishing. p. 233. ISBN 978-1-4195-5218-2 . * ^ Tmh (2006). _Study Package For Medical College Entrance Examinations_. Tata McGraw-Hill. p. 6.22. ISBN 978-0-07-061637-0 . * ^ Ville, Claude Alvin; Walker, Warren Franklin; Barnes, Robert D. (1984). _General zoology_. Saunders College Pub. p. 467. ISBN 978-0-03-062451-3 . * ^ Hamilton, William James; Boyd, James Dixon; Mossman, Harland Winfield (1945). _ Human embryology: (prenatal development of form and function)_. Williams & Wilkins. p. 330. * ^ Philips, Joy B. (1975). _Development of vertebrate anatomy_. Mosby. p. 176. ISBN 978-0-8016-3927-2 . * ^ _The Encyclopedia Americana: a library of universal knowledge, Volume 10_. Encyclopedia Americana Corp. 1918. p. 281. * ^ Romoser, William S.; Stoffolano, J. G. (1998). _The science of entomology_. WCB McGraw-Hill. p. 156. ISBN 978-0-697-22848-2 . * ^ Ralls K, Ballou J (April 1982). "Effect of inbreeding on juvenile mortality in some small mammal species". _Lab. Anim_. 16 (2): 159–66. PMID 7043080 . doi :10.1258/002367782781110151 . * ^ Charlesworth D, Willis JH (2009). "The genetics of inbreeding depression". _Nat. Rev. Genet_. 10 (11): 783–96. PMID 19834483 . doi :10.1038/nrg2664 . * ^ Bernstein H, Hopf FA, Michod RE (1987). "The molecular basis of the evolution of sex". _Adv. Genet_. Advances in Genetics. 24: 323–70. ISBN 9780120176243 . PMID 3324702 . doi :10.1016/s0065-2660(08)60012-7 . * ^ _A_ _B_ _C_ Pusey A, Wolf M (1996). " Inbreeding avoidance in animals". _Trends Ecol. Evol. (Amst.)_. 11 (5): 201–6. PMID 21237809 . doi :10.1016/0169-5347(96)10028-8 . * ^ Petrie, M.; Kempenaers, B. (1998). "Extra-pair paternity in birds: Explaining variation between species and populations". _Trends in Ecology and Evolution_. 13 (2): 52–57. PMID 21238200 . doi :10.1016/s0169-5347(97)01232-9 . * ^ Rastogi, V. B. (1997). _Modern Biology_. Pitambar Publishing. p. 3. ISBN 978-81-209-0496-5 . * ^ Levy, Charles K. (1973). _Elements of Biology_. Appleton-Century-Crofts. p. 108. ISBN 978-0-390-55627-1 . * ^ Begon, M., Townsend, C., Harper, J. (1996). _Ecology: Individuals, populations and communities _ (Third edition). Blackwell Science, London. ISBN 0-86542-845-X , ISBN 0-632-03801-2 , ISBN 0-632-04393-8 . * ^ predation. Britannica.com. Retrieved on 2011-11-23. * ^ Marchetti, Mauro; Rivas, Victoria (2001). _Geomorphology and environmental impact assessment_. Taylor & Francis. p. 84. ISBN 978-90-5809-344-8 . * ^ Allen, Larry Glen; Pondella, Daniel J.; Horn, Michael H. (2006). _ Ecology of marine fishes: California and adjacent waters_. University of California Press. p. 428. ISBN 978-0-520-24653-9 . * ^ Clutterbuck, Peter (2000). _Understanding Science: Upper Primary_. Blake Education. p. 9. ISBN 978-1-86509-170-9 . * ^ Gupta, P.K. _Genetics Classical To Modern_. Rastogi Publications. p. 26. ISBN 978-81-7133-896-2 . * ^ Garrett, Reginald; Grisham, Charles M. (2010). _Biochemistry_. Cengage Learning. p. 535. ISBN 978-0-495-10935-8 . * ^ _New Scientist_. IPC Magazines. 152 (2050–2055): 105. 1996. CS1 maint: Untitled periodical (link ) * ^ Castro, Peter; Huber, Michael E. (2007). _Marine Biology_ (7th ed.). McGraw-Hill. p. 376. ISBN 978-0-07-722124-9 . * ^ "Monster fish crushed opposition with strongest bite ever". smh.com.au. * ^ Campbell, Niel A. (1990). _Biology_ (2nd ed.). Benjamin/Cummings Pub. Co. p. 560. ISBN 978-0-8053-1800-5 . * ^ Richard R. Behringer; Alexander D. Johnson; Robert E. Krumlauf; Michael K. Levine; Nipam Patel; Neelima Sinha, eds. (2008). _Emerging model organisms: a laboratory manual, Volume 1_ (illustrated ed.). Cold Spring Harbor Laboratory Press. p. 1. ISBN 978-0-87969-872-0 . * ^ Hall, Brian Keith; Hallgrímsson, Benedikt; Strickberger, Monroe W. (2008). _Strickberger's evolution: the integration of genes, organisms and populations_. Jones & Bartlett Learning. p. 278. ISBN 978-0-7637-0066-9 . * ^ Hamilton, Gina. _Kingdoms of Life – Animals (ENHANCED eBook)_. Lorenz Educational Press. p. 9. ISBN 978-1-4291-1610-7 . * ^ _A_ _B_ Maloof, Adam C.; Rose, Catherine V.; Beach, Robert; Samuels, Bradley M.; Calmet, Claire C.; Erwin, Douglas H.; Poirier, Gerald R.; Yao, Nan; Simons, Frederik J. (17 August 2010). "Possible animal-body fossils in pre-Marinoan limestones from South Australia". _ Nature Geoscience_. 3 (9): 653–659. Bibcode :2010NatGe...3..653M. doi :10.1038/ngeo934 . Pdf * ^ Costa, James T.; Darwin, Charles (2009). _The annotated Origin: a facsimile of the first edition of On the origin of species_. Harvard University Press. p. 308. ISBN 978-0-674-03281-1 . * ^ Schopf, J. William (1999). _Evolution!: facts and fallacies_. Academic Press. p. 7. ISBN 978-0-12-628860-5 . * ^ Milsom, Clare; Rigby, Sue (2009). _Fossils at a Glance_. John Wiley and Sons. ISBN 978-1-4051-9336-8 . * ^ Campbell, Neil A.; Reece, Jane B. (2005). _Biology_ (7th ed.). Pearson, Benjamin Cummings. p. 526. ISBN 978-0-8053-7171-0 . * ^ Seilacher, Adolf; Bose, Pradip K.; Pfluger, Friedrich (2 October 1998). " Triploblastic animals more than 1 billion years ago: trace fossil evidence from india". _Science_. 282 (5386): 80–83. Bibcode :1998Sci...282...80S. PMID 9756480 . doi :10.1126/science.282.5386.80 . * ^ Matz, Mikhail V.; Frank, Tamara M.; Marshall, N. Justin; Widder, Edith A.; Johnsen, Sönke (9 December 2008). "Giant Deep-Sea Protist Produces Bilaterian-like Traces" (PDF). _Current Biology_. 18 (23): 1–6. PMID 19026540 . doi :10.1016/j.cub.2008.10.028 . Archived (PDF) from the original on 16 December 2008. Retrieved 2008-12-05. * ^ Reilly, Michael (20 November 2008). "Single-celled giant upends early evolution". MSNBC. Retrieved 2008-12-05. * ^ Pisani, Davide; Pett, Walker; Dohrmann, Martin; Feuda, Roberto; Rota-Stabelli, Omar; Philippe, Hervé; Lartillot, Nicolas; Wörheide, Gert (2015-12-15). "Genomic data do not support comb jellies as the sister group to all other animals". _Proceedings of the National Academy of Sciences_. 112 (50): 15402–15407. Bibcode :2015PNAS..11215402P. ISSN 0027-8424 . PMC 4687580  _. PMID 26621703 . doi :10.1073/pnas.1518127112 . * ^ Simion, Paul; Philippe, Hervé; Baurain, Denis; Jager, Muriel; Richter, Daniel J.; Franco, Arnaud Di; Roure, Béatrice; Satoh, Nori; Quéinnec, Éric (2017-04-03). "A Large and Consistent Phylogenomic Dataset Supports Sponges as the Sister Group to All Other Animals". Current Biology_. 27 (7): 958–967. ISSN 0960-9822 . doi :10.1016/j.cub.2017.02.031 . * ^ Shen, Xing-Xing; Hittinger, Chris Todd; Rokas, Antonis (2017-04-10). "Contentious relationships in phylogenomic studies can be driven by a handful of genes". _ Nature Ecology & Evolution_. 1 (5). ISSN 2397-334X . doi :10.1038/s41559-017-0126 . * ^ Ryan, Joseph F.; Pang, Kevin; Schnitzler, Christine E.; Nguyen, Anh-Dao; Moreland, R. Travis; Simmons, David K.; Koch, Bernard J.; Francis, Warren R.; Havlak, Paul (2013-12-13). "The Genome of the Ctenophore Mnemiopsis leidyi and Its Implications for Cell Type Evolution". _Science_. 342 (6164): 1242592. ISSN 0036-8075 . PMC 3920664  _. PMID 24337300 . doi :10.1126/science.1242592 . * ^ Bhamrah, H. S.; Juneja, Kavita (2003). An Introduction to Porifera_. Anmol Publications PVT. LTD. p. 58. ISBN 978-81-261-0675-2 . * ^ Sumich, James L. (2008). _Laboratory and Field Investigations in Marine Life_. Jones & Bartlett Learning. p. 67. ISBN 978-0-7637-5730-4 . * ^ Jessop, Nancy Meyer (1970). _Biosphere; a study of life_. Prentice-Hall. p. 428. * ^ Sharma, N. S. (2005). _Continuity And Evolution Of Animals_. Mittal Publications. p. 106. ISBN 978-81-8293-018-6 . * ^ _A_ _B_ Dunn, Casey W.; et al. (April 2008). "Broad phylogenomic sampling improves resolution of the animal tree of life". _Nature_. 452 (7188): 745–9. Bibcode :2008Natur.452..745D. PMID 18322464 . doi :10.1038/nature06614 . * ^ Ryan, Joseph F.; Pang, Kevin; Schnitzler, Christine E.; Nguyen, Anh-Dao; Moreland, R. Travis; Simmons, David K.; Koch, Bernard J.; Francis, Warren R.; Havlak, Paul (13 December 2013). "The Genome of the Ctenophore Mnemiopsis leidyi and Its Implications for Cell Type Evolution". _Science_. 342 (6164): 1242592. ISSN 0036-8075 . PMC 3920664  _. PMID 24337300 . doi :10.1126/science.1242592 . * ^ Moroz, Leonid L.; Kocot, Kevin M.; Citarella, Mathew R.; Dosung, Sohn; Norekian, Tigran P.; Povolotskaya, Inna S.; Grigorenko, Anastasia P.; Dailey, Christopher; Berezikov, Eugene (5 June 2014). "The ctenophore genome and the evolutionary origins of neural systems". Nature_. 510 (7503): 109–114. Bibcode :2014Natur.510..109M. ISSN 0028-0836 . PMC 4337882  _. PMID 24847885 . doi :10.1038/nature13400 . * ^ Whelan, Nathan V.; Kocot, Kevin M.; Moroz, Leonid L.; Halanych, Kenneth M. (5 May 2015). "Error, signal, and the placement of Ctenophora sister to all other animals". Proceedings of the National Academy of Sciences_. 112 (18): 5773–5778. Bibcode :2015PNAS..112.5773W. ISSN 0027-8424 . PMC 4426464  _. PMID 25902535 . doi :10.1073/pnas.1503453112 . * ^ Philippe, Hervé; Derelle, Romain; Lopez, Philippe; Pick, Kerstin; Borchiellini, Carole; Boury-Esnault, Nicole; Vacelet, Jean; Renard, Emmanuelle; Houliston, Evelyn (April 2009). "Phylogenomics Revives Traditional Views on Deep Animal Relationships". Current Biology_. 19 (8): 706–712. ISSN 0960-9822 . PMID 19345102 . doi :10.1016/j.cub.2009.02.052 . * ^ Pick, K. S.; Philippe, H.; Schreiber, F.; Erpenbeck, D.; Jackson, D. J.; Wrede, P.; Wiens, M.; Alié, A.; Morgenstern, B. (September 2010). "Improved Phylogenomic Taxon Sampling Noticeably Affects Nonbilaterian Relationships". _ Molecular Biology and Evolution_. 27 (9): 1983–1987. ISSN 0737-4038 . PMC 2922619  _. PMID 20378579 . doi :10.1093/molbev/msq089 . * ^ Nosenko, Tetyana; Schreiber, Fabian; Adamska, Maja; Adamski, Marcin; Eitel, Michael; Hammel, Jörg; Maldonado, Manuel; Müller, Werner E. G.; Nickel, Michael (1 April 2013). "Deep metazoan phylogeny: When different genes tell different stories". Molecular Phylogenetics and Evolution_. 67 (1): 223–233. PMID 23353073 . doi :10.1016/j.ympev.2013.01.010 . * ^ Pisani, Davide; Pett, Walker; Dohrmann, Martin; Feuda, Roberto; Rota-Stabelli, Omar; Philippe, Hervé; Lartillot, Nicolas; Wörheide, Gert (15 December 2015). "Genomic data do not support comb jellies as the sister group to all other animals". _Proceedings of the National Academy of Sciences_. 112 (50): 201518127. Bibcode :2015PNAS..11215402P. ISSN 0027-8424 . PMC 4687580  _. PMID 26621703 . doi :10.1073/pnas.1518127112 . * ^ Langstroth, Lovell; Langstroth, Libby (2000). Newberry, Todd, ed. A Living Bay: The Underwater World of Monterey Bay_. University of California Press. p. 244. ISBN 978-0-520-22149-9 . * ^ Safra, Jacob E. (2003). _The New Encyclopædia Britannica, Volume 16_. Encyclopædia Britannica. p. 523. ISBN 978-0-85229-961-6 .

* ^ Kotpal, R. L. _Modern Text Book of Zoology: Invertebrates_. Rastogi Publications. p. 184. ISBN 978-81-7133-903-7 . * ^ Chang, E. Sally; Neuhof, Moran; Rubinstein, Nimrod D.; Diamant, Arik; Philippe, Hervé; Huchon, Dorothée; Cartwright, Paulyn (1 December 2015). "Genomic insights into the evolutionary origin of Myxozoa within Cnidaria". _Proceedings of the National Academy of Sciences_. 112 (48): 14912–14917. Bibcode :2015PNAS..11214912C. ISSN 0027-8424 . PMC 4672818  _. PMID 26627241 . doi :10.1073/pnas.1511468112 . * ^ Marlétaz, Ferdinand; Martin, Elise; Perez, Yvan; Papillon, Daniel; Caubit, Xavier; Lowe, Christopher J.; Freeman, Bob; Fasano, Laurent; Dossat, Carole (8 August 2006). "Chaetognath phylogenomics: a protostome with deuterostome-like development". Current Biology_. 16 (15): R577–R578. ISSN 0960-9822 . PMID 16890510 . doi :10.1016/j.cub.2006.07.016 . * ^ Hejnol, A.; Obst, M.; Stamatakis, A.; Ott, M.; Rouse, G. W.; Edgecombe, G. D.; et al. (2009). "Assessing the root of bilaterian animals with scalable phylogenomic methods" . _Proceedings of the Royal Society B: Biological Sciences_. 276: 4261–4270. PMC 2817096  _. PMID 19759036 . doi :10.1098/rspb.2009.0896 . CS1 maint: Explicit use of et al. (link ) * ^ A_ _B_ Philippe, H.; Brinkmann, H.; Copley, R. R.; Moroz, L. L.; Nakano, H.; Poustka, A. J.; Wallberg, A.; Peterson, K. J.; Telford, M. J. (2011). "Acoelomorph flatworms are deuterostomes related to _Xenoturbella_" . _Nature_. 470 (7333): 255–258. Bibcode :2011Natur.470..255P. PMC 4025995  _. PMID 21307940 . doi :10.1038/nature09676 . * ^ Edgecombe, G. D.; Giribet, G.; Dunn, C. W.; Hejnol, A.; Kristensen, R. M.; Neves, R. C.; Rouse, G. W.; Worsaae, K.; Sørensen, M. V. (2011). "Higher-level metazoan relationships: Recent progress and remaining questions". Organisms Diversity & Evolution_. 11 (2): 151–172. doi :10.1007/s13127-011-0044-4 . * ^ Rouse, Greg W.; Wilson, Nerida G.; Carvajal, Jose I.; Vrijenhoek, Robert C. (2016-02-03). "New deep-sea species of Xenoturbella and the position of Xenacoelomorpha". _Nature_. 530 (7588): 94–97. Bibcode :2016Natur.530...94R. PMID 26842060 . doi :10.1038/nature16545 . Retrieved 2016-02-03. * ^ Cannon, Johanna T.; Vellutini, Bruno C.; Smith III, Julian.; Ronquist, Frederik; Jondelius, Ulf; Hejnol, Andreas (2016-02-03). " Xenacoelomorpha is the sister group to Nephrozoa". _Nature_. 530 (7588): 89–93. Bibcode :2016Natur.530...89C. PMID 26842059 . doi :10.1038/nature16520 . Retrieved 2016-02-03. * ^ Gone Missing, circa 1892 * ^ Peters, Kenneth E.; Walters, Clifford C.; Moldowan, J. Michael (2005). _The Biomarker Guide: Biomarkers and isotopes in petroleum systems and Earth history_. 2. Cambridge University Press. p. 717. ISBN 978-0-521-83762-0 . * ^ Safra, Jacob E. (2003). _The New Encyclopædia Britannica, Volume 1; Volume 3_. Encyclopædia Britannica. p. 767. ISBN 978-0-85229-961-6 . * ^ Valentine, James W. (July 1997). "Cleavage patterns and the topology of the metazoan tree of life" . _PNAS_. The National Academy of Sciences. 94 (15): 8001–8005. Bibcode :1997PNAS...94.8001V. PMC 21545  _. PMID 9223303 . doi :10.1073/pnas.94.15.8001 . * ^ Hyde, Kenneth (2004). Zoology: An Inside View of Animals_. Kendall Hunt. p. 345. ISBN 978-0-7575-0997-1 . * ^ Alcamo, Edward (1998). _ Biology Coloring Workbook_. The Princeton Review. p. 220. ISBN 978-0-679-77884-4 . * ^ Holmes, Thom (2008). _The First Vertebrates_. Infobase Publishing. p. 64. ISBN 978-0-8160-5958-4 . * ^ Rice, Stanley A. (2007). _Encyclopedia of evolution_. Infobase Publishing. p. 75. ISBN 978-0-8160-5515-9 . * ^ Tobin, Allan J.; Dusheck, Jennie (2005). _Asking about life_. Cengage Learning. p. 497. ISBN 978-0-534-40653-0 . * ^ Simakov, Oleg; Kawashima, Takeshi; Marlétaz, Ferdinand; Jenkins, Jerry; Koyanagi, Ryo; Mitros, Therese; Hisata, Kanako; Bredeson, Jessen; Shoguchi, Eiichi (26 November 2015). "Hemichordate genomes and deuterostome origins". _Nature_. 527 (7579): 459–465. Bibcode :2015Natur.527..459S. ISSN 0028-0836 . PMC 4729200  _. PMID 26580012 . doi :10.1038/nature16150 . * ^ Safra, Jacob E. (2003). The New Encyclopædia Britannica, Volume 19_. Encyclopædia Britannica. p. 791. ISBN 978-0-85229-961-6 .

* ^ Dawkins, Richard (2005). _The Ancestor's Tale: A Pilgrimage to the Dawn of Evolution_. Houghton Mifflin Harcourt. p. 381. ISBN 978-0-618-61916-0 . * ^ Prewitt, Nancy L.; Underwood, Larry S.; Surver, William (2003). _BioInquiry: making connections in biology_. John Wiley. p. 289. ISBN 978-0-471-20228-8 . * ^ Schmid-Hempel, Paul (1998). _Parasites in social insects_. Princeton University Press. p. 75. ISBN 978-0-691-05924-2 . * ^ "Biodiversity: Mollusca". The Scottish Association for Marine Science. Archived from the original on 8 July 2006. Retrieved 2007-11-19. * ^ Russell, Bruce J. (Writer), Denning, David (Writer) (2000). _Branches on the Tree of Life: Annelids_ (VHS). BioMEDIA ASSOCIATES. * ^ Eernisse, Douglas J.; Albert, James S.; Anderson, Frank E. (1 September 1992). " Annelida and Arthropoda are not sister taxa: A phylogenetic analysis of spiralean metazoan morphology". _Systematic Biology_. 41 (3): 305–330. JSTOR 2992569 . doi :10.2307/2992569 . * ^ Kim, Chang Bae; Moon, Seung Yeo; Gelder, Stuart R.; Kim, Won (September 1996). "Phylogenetic Relationships of Annelids, Molluscs, and Arthropods Evidenced from Molecules and Morphology". _Journal of Molecular Evolution_. New York: Springer. 43 (3): 207–215. PMID 8703086 . doi :10.1007/PL00006079 . * ^ Collins, Allen G. (1995). _The Lophophore_. University of California Museum of Paleontology. Retrieved 2015-03-23. * ^ Adoutte, André; Balavoine, Guillaume; Lartillot, Nicolas; Lespinet, Olivier; Prud'Homme, Benjamin; De Rosa, Renaud (25 April 2000). "The new animal phylogeny: Reliability and implications" . _Proceedings of the National Academy of Sciences of the United States of America_. 97 (9): 4453–4456. Bibcode :2000PNAS...97.4453A. PMC 34321  _. PMID 10781043 . doi :10.1073/pnas.97.9.4453 . * ^ Passamaneck, Yale J. (2003). " Molecular Phylogenetics of the Metazoan Clade Lophotrochozoa" (PDF). Massachusetts Institute of Technology / Woods Hole Oceanographic Institution. p. 124. Retrieved 2015-03-23. * ^ Sundberg, Per; Turbeville, J. M.; Lindh, Susanne (September 2001). "Phylogenetic relationships among higher nemertean (Nemertea) taxa inferred from 18S rDNA sequences". Molecular Phylogenetics and Evolution_. 20 (3): 327–334. PMID 11527461 . doi :10.1006/mpev.2001.0982 . * ^ Boore, Jeffrey L.; Staton, Joseph L. (February 2002). "The mitochondrial genome of the Sipunculid Phascolopsis gouldii supports its association with Annelida rather than Mollusca" (PDF). _Molecular Biology and Evolution_. 19 (2): 127–137. PMID 11801741 . doi :10.1093/oxfordjournals.molbev.a004065 . Archived (PDF) from the original on 28 November 2007. Retrieved 2007-11-19. * ^ Nielsen, Claus (2001). " Bryozoa (Ectoprocta: \'Moss\' Animals)". _ Encyclopedia of Life Sciences_. John Wiley & Sons, Ltd. ISBN 0-470-01617-5 . doi :10.1038/npg.els.0001613 . Retrieved 2008-01-19. * ^ _A_ _B_ Gilson, Étienne (2004). _El espíritu de la filosofía medieval_. Ediciones Rialp. p. 384. ISBN 978-84-321-3492-0 . * ^ Ruiz-Trillo, Iñaki; Riutort, Marta; Littlewood, D. Timothy J.; Herniou, Elisabeth A.; Baguña, Jaume (19 March 1999). "Acoel Flatworms: Earliest Extant Bilaterian Metazoans, Not Members of Platyhelminthes". _Science_. 283 (5409): 1919–1923. Bibcode :1999Sci...283.1919R. PMID 10082465 . doi :10.1126/science.283.5409.1919 . * ^ Todaro, Antonio. "Gastrotricha: Overview". _Gastrotricha: World Portal_. University of Modena & Reggio Emilia. Retrieved 2008-01-26. * ^ Kristensen, Reinhardt Møbjerg (July 2002). "An Introduction to Loricifera, Cycliophora, and Micrognathozoa". _Integrative and Comparative Biology_. 42 (3): 641–651. PMID 21708760 . doi :10.1093/icb/42.3.641 . * ^ Bourlat, SJ; Nielsen, C; Economou, AD; Telford, MJ (2008). "Testing the new animal phylogeny: a phylum level molecular analysis of the animal kingdom". _Mol Phylogenet Evol_. 49 (1): 23–31. PMID 18692145 . doi :10.1016/j.ympev.2008.07.008 . * ^ Helmkampf, M; Bruchhaus, I; Hausdorf, B (2008). "Phylogenomic analyses of lophophorates (brachiopods, phoronids and bryozoans) confirm the Lophotrochozoa concept" . _Proc Biol Sci_. 275 (1645): 1927–1933. PMC 2593926  _. PMID 18495619 . doi :10.1098/rspb.2008.0372 . * ^ Giribet, G; Distel, DL; Polz, M; Sterrer, W; Wheeler, WC (2000). " Triploblastic relationships with emphasis on the acoelomates and the position of Gnathostomulida, Cycliophora, Plathelminthes, and Chaetognatha: a combined approach of 18S rDNA sequences and morphology". Syst Biol_. 49 (3): 539–562. PMID 12116426 . doi :10.1080/10635159950127385 . * ^ _A_ _B_ The World Conservation Union. 2014. _IUCN Red List of Threatened Species _, 2014.3. Summary Statistics for Globally Threatened Species. Table 1: Numbers of threatened species by major groups of organisms (1996–2014). * ^ Putnam, Nicholas H.; et al. (July 2007). " Sea anemone genome reveals ancestral eumetazoan gene repertoire and genomic organization". _Science _. 317 (5834): 86–94. Bibcode :2007Sci...317...86P. PMID 17615350 . doi :10.1126/science.1139158 . * ^ Xiujuan Wang; Lavrov, Dennis V. (27 October 2006). "Mitochondrial Genome of the homoscleromorph _Oscarella carmela_ (Porifera, Demospongiae) Reveals Unexpected Complexity in the Common Ancestor of Sponges and Other Animals". _ Molecular Biology and Evolution_. 24 (2): 363–373. PMID 17090697 . doi :10.1093/molbev/msl167 . Pdf


* Nielsen, Claus (2012). _ Animal Evolution: Interrelationships of the Living Phyla_ (3rd ed.). New York: Oxford University Press . ISBN 978-0-19-960602-3 . * Schmidt-Nielsen, Knut (1997). _ Animal Physiology: Adaptation and Environment_ (5th ed.). Cambridge University Press . ISBN 0-521-57098-0 . * Magloire, Kim (2004). _Cracking the AP Biology Exam, 2004–2005 Edition_. The Princeton Review. ISBN 978-0-375-76393-9 . * Sangwal, Keshra (2007). _Additives and crystallization processes: from fundamentals to applications_. John Wiley and Sons. ISBN 978-0-470-06153-4 . * Hutchins, Michael (2003). _Grzimek's Animal Life Encyclopedia_ (2nd ed.). Detroit: Gale. ISBN 0-7876-5777-8 . * Holmes, Thom (2008). _The First Vertebrates_. Infobase Publishing. ISBN 978-0-8160-5958-4 .


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