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Philometra Otolithi
''Philometra otolithi'' is a species of parasitic nematode of fishes, infecting the gonads of marine perciform fishes off the eastern Indian coast. It was first found in the tigertooth croaker, '' Otolithes ruber''. It is distinguished from its cogenerates by the gubernaculum structure in males, as well as the shape and structure of the females' cephalic and caudal ends, and their oesophagus The esophagus (American English) or oesophagus (British English; both ), non-technically known also as the food pipe or gullet, is an organ in vertebrates through which food passes, aided by peristaltic contractions, from the pharynx to the ....Moravec, Frantisek, and Jayaraman Manoharan. "Gonad-infecting philometrids (Nematoda: Philometridae) including four new species from marine fishes off the eastern coast of India." Folia Parasitologica 60.2 (2013): 105. References Further reading *Moravec, František, Maryam Khosheghbal, and Jamileh Pazooki. "Dichelyne (Dichelyne) spinigeru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal
Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motility, able to move, can Sexual reproduction, reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of Cell (biology), cells, the blastula, during Embryogenesis, embryonic development. Over 1.5 million Extant taxon, living animal species have been Species description, described—of which around 1 million are Insecta, insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have Ecology, complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a Symmetry in biology#Bilate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nematode
The nematodes ( or grc-gre, Νηματώδη; la, Nematoda) or roundworms constitute the phylum Nematoda (also called Nemathelminthes), with plant-Parasitism, parasitic nematodes also known as eelworms. They are a diverse animal phylum inhabiting a broad range of environments. Less formally, they are categorized as Helminths, but are taxonomically classified along with Arthropod, arthropods, Tardigrade, tardigrades and other moulting animalia, animals in the clade Ecdysozoa, and unlike platyhelminthe, flatworms, have tubular digestion, digestive systems with openings at both ends. Like tardigrades, they have a reduced number of Hox genes, but their sister phylum Nematomorpha has kept the ancestral protostome Hox genotype, which shows that the reduction has occurred within the nematode phylum. Nematode species can be difficult to distinguish from one another. Consequently, estimates of the number of nematode species described to date vary by author and may change rapidly over ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Secernentea
Secernentea was a class of nematodes in the Classical Phylogeny System (Chitwood, 1958) and is no longer in use. This morphological-based classification system has been replaced by the Modern Phylogeny system, where taxonomy assignment is based on small subunit ribosomal DNA (SSU rDNA). Characteristics of Secernentea are: * Amphid apertures are pore/slit-like * Derids are present in some; located near nerve ring * Phasmids are present; posterior * Excretory system is tubular * Cuticle is striated in two to four layers; lateral field is present * Three esophageal glands; esophageal structure varies * Males generally have one testis * Caudal alae are common * Sensory papillae are cephalic only; may be caudal papillae in males * Mostly terrestrial * Rarely found in fresh or marine water Systematics Subclasses and orders of Secernentea are:Tree of Life Web Project (ToL) (2002)Nematoda. Version of January 1, 2002. Retrieved November 2, 2008. * Subclass Rhabditia (paraphyletic?) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Camallanida
The Camallanida are an order of nematodes. * Parasites of terrestrial and aquatic vertebrates * Copepods as obligatory secondary hosts They are sometimes included in the Spirurida as a suborder Camallanina. Notable species and genera *''Dracunculus medinensis ''Dracunculus medinensis'', or Guinea worm, is a nematode that causes dracunculiasis, also known as guinea worm disease. The disease is caused by the female which, at up to in length, is among the longest nematodes infecting humans. In contr ...'' (human as final host) and '' Anguillicola crassus'' (eels as final host) are important species. *'' Philometra'' is a genus in the family Philometridae that parasitises fish. References * Nematode orders {{Secernentea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philometridae
Philometridae is a family of nematodes belonging to the order Rhabditida. All Philometridae are obligate tissue parasites of fish. Life cycle Philometridae cycle between two hosts: Cyclopoida (small crustaceans) as an intermediate host, and various fish as a definitive host. First-stage larvae are ejected into the water, and develop to the third stage if they're eaten by a cyclopoid. Once the copepod is eaten by a fish, the larvae develop into adults and mate. Pregnant females migrate to a final site just under the fish's skin, in the swim bladder, or in the coelom; males die soon after mating and in many Philometridae species they have never been described. Genera * '' Afrophilometra'' Moravec, Charo-Karisa & Jirků, 2009 *Alinema Rasheed, 1963 *Barracudia Moravec & Shamsi, 2017 *Buckleyella Rasheed, 1963 *Caranginema Moravec, Montoya-Mendoza & Salgado-Maldonado, 2008 *Clavinema Yamaguti, 1935 *Clavinemoides Moravec, Khosheghbal & Pazooki, 2013 *Congerinema Moravec, Nagasawa, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philometra
''Philometra'' is a genus of nematodes, which are parasites of marine and freshwater fishes. The genus was erected by Oronzio Gabriele Costa in 1845. Species in this genus are worldwide. They parasitize the body cavities, tissues and ovaries of both marine and freshwater fishes. When still in the larval stages, these worms move to the body cavities or subcutaneous tissues in the host. This migration can cause damage to skeletal joints, result in internal bleeding, and inflame visceral organs. Emaciation and lowered growth rates may result from this. Infestation produces nodules under the skin. When the worms are in the adult or juvenile stage, these nodules may be visible between the rays of the fins or may cause the scales to raise up. Larger nodules may be the result of gravid females which may rupture the skin surface. Once ruptured, the female disintegrates. This allows the release of the live larvae into the water. This wound on the fish then heals, leaving almost no scarri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
František Moravec (parasitologist)
František Moravec (born 1 January 1939) is a Czech parasitologist who specialises on the Nematodes, especially the nematodes parasites of fishes. His research is mainly in the field of taxonomy of the Nematoda. Education and career Moravec was born on 1 January 1939 in Velká Bystřice. He was in high school in Olomouc then was a student in the Masaryk University in Brno, Czech Republic (at that time Czechoslovakia). For his Masters in 1962, he studied the parasitic worms of reptiles of Czechoslovakia. After graduation, he worked at the Institute of Parasitology of the Czech Academy of Sciences in České Budějovice, and in 1970 completed his thesis on nematodes parasites in fish. He is a world authority on Nematodes, especially their systematics and biology. Research Among the most important works by Moravec, Tomáš Scholz mentions his revision of the genera '' Rhabdochona'' and '' Anguillicola'', and also his clarification of the family Capillariidae, for which he propose ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parasite
Parasitism is a close relationship between species, where one organism, the parasite, lives on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. The entomologist E. O. Wilson has characterised parasites as "predators that eat prey in units of less than one". Parasites include single-celled protozoans such as the agents of malaria, sleeping sickness, and amoebic dysentery; animals such as hookworms, lice, mosquitoes, and vampire bats; fungi such as Armillaria mellea, honey fungus and the agents of ringworm; and plants such as mistletoe, dodder, and the Orobanchaceae, broomrapes. There are six major parasitic Behavioral ecology#Evolutionarily stable strategy, strategies of exploitation of animal hosts, namely parasitic castration, directly transmitted parasitism (by contact), wikt:trophic, trophicallytransmitted parasitism (by being eaten), Disease vector, vector-transmitted parasitism, parasitoidism, and micropreda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gonad
A gonad, sex gland, or reproductive gland is a mixed gland that produces the gametes and sex hormones of an organism. Female reproductive cells are egg cells, and male reproductive cells are sperm. The male gonad, the testicle, produces sperm in the form of spermatozoa. The female gonad, the ovary, produces egg cells. Both of these gametes are haploid cells. Some hermaphroditic animals have a type of gonad called an ovotestis. Evolution It is hard to find a common origin for gonads, but gonads most likely evolved independently several times. Regulation The gonads are controlled by luteinizing hormone and follicle-stimulating hormone, produced and secreted by gonadotropes or gonadotrophins in the anterior pituitary gland. This secretion is regulated by gonadotropin-releasing hormone produced in the hypothalamus. Development Gonads start developing as a common primordium (an organ in the earliest stage of development), in the form of genital ridges, which are only l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perciform
Perciformes (), also called the Percomorpha or Acanthopteri, is an order (biology), order or superorder of Actinopterygii, ray-finned fish. If considered a single order, they are the most numerous order of vertebrates, containing about 41% of all bony fish. Perciformes means "perch-like". Perciformes is an Order (biology), Order within the Clade Percomorpha consisting of "perch-like" Percomorphans. This group comprises over 10,000 species found in almost all aquatic ecosystems. The order contains about 160 families, which is the most of any order within the vertebrates. It is also the most variably sized order of vertebrates, ranging from the ''Schindleria brevipinguis'' to the marlin in the genus ''Makaira''. They first appeared and diversified in the Late Cretaceous. Among the well-known members of this group are perch and darters (Percidae), sea bass and groupers (Serranidae). Characteristics The Fish anatomy#Fins, dorsal and Fish anatomy#Fins, anal fins are divided into ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Otolithes Ruber
''Otolithes ruber'', commonly known as the tigertooth croaker, silver teraglin, wiretooth, snapper kob, snapper salmon, Yankee whiting or Yankee salmon is a species of marine ray-finned fish belonging to the family Sciaenidae, the drums and croakers. This species is found in the Indo-Pacific region. Taxonomy ''Otolithes ruber'' was first formally described in 1801 as ''Johnius ruber'' by the German naturalists Marcus Elieser Bloch and Johann Gottlob Theaenus Schneider with the "Indian Ocean" given as its type locality. In 1817 Lorenz Oken proposed the new genus '' Otolithes'' for this species and in 1863 Theodore Gill designated ''Johnius ruber'' as the type species of the genus. The genus ''Otolithes'' is included in the subfamily Otolithinae by some workers, but the 5th edition of ''Fishes of the World'' does not recognise subfamilies within the Sciaenidae, which it places in the order Acanthuriformes. It had been recognised that there were more than two taxonomic units, o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
