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Astrometis Sertulifera
''Astrometis sertulifera'', the fragile rainbow star, is the only uncontested species of sea star in the genus ''Astrometis''. Appearance The common name comes from the often brilliant coloration of the species. The spines on the top side can be purple, orange, or blue with red tips, and the tube feet often have several colors as well. The species grows to 8.1 cm, and almost always is found with 5 symmetric arms. Behavior Like all species of sea star, this species can occasionally break off (and later regrow) one of its arms, but has less tendency to discard its limbs than most sea stars in California. Eating habits They feed primarily on small crabs, though chitons, snails, clams, barnacles, brittle stars, and urchins have also been found in the diet. Their method of feeding is unique among sea stars. Rather than grasp their prey from below with their tube feet, they capture prey on their top surface using pedicellariae A pedicellaria (plural: pedicellariae) is a small ... [...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] |
Echinoderm
An echinoderm () is any member of the phylum Echinodermata (). The adults are recognisable by their (usually five-point) radial symmetry, and include starfish, brittle stars, sea urchins, sand dollars, and sea cucumbers, as well as the sea lilies or "stone lilies". Adult echinoderms are found on the sea bed at every ocean depth, from the intertidal zone to the abyssal zone. The phylum contains about 7,000 living species, making it the second-largest grouping of deuterostomes, after the chordates. Echinoderms are the largest entirely marine phylum. The first definitive echinoderms appeared near the start of the Cambrian. The echinoderms are important both ecologically and geologically. Ecologically, there are few other groupings so abundant in the biotic desert of the deep sea, as well as shallower oceans. Most echinoderms are able to reproduce asexually and regenerate tissue, organs, and limbs; in some cases, they can undergo complete regeneration from a single limb. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asteroidea
Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea (). Common usage frequently finds these names being also applied to ophiuroids, which are correctly referred to as brittle stars or basket stars. Starfish are also known as asteroids due to being in the class Asteroidea. About 1,900 species of starfish live on the seabed in all the world's oceans, from warm, tropical zones to frigid, polar regions. They are found from the intertidal zone down to abyssal depths, at below the surface. Starfish are marine invertebrates. They typically have a central disc and usually five arms, though some species have a larger number of arms. The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates. Many species are brightly coloured in various shades of red or orange, while others are blue, grey or brown. Starfish have tube feet operated by a hydraulic system and a mouth at the centre of the oral or lower surface. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forcipulatida
The Forcipulatida are an order of sea stars, containing three families and 49 genera Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclat .... Description Forcipulatids share with the brisingid sea stars distinctive pedicellariae, consisting of a short stalk with three skeletal Ossicle (echinoderm), ossicles. Unlike that group, however, the forcipulatids tend to have more robust bodies. The order includes some well-known species, such as the common starfish, ''Asterias rubens''. This order can be commonly found from Nor Carolina in the United States all the way to Santos in Brazil. Phylogeny The order is divided into three families: * Family Asteriidae — 39 genera * Family Heliasteridae — two genera * Family Zoroasteridae — eight genera World Register of Marine Species gives ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asteriidae
The Asteriidae are a diverse family of Asteroidea (sea stars) in the order Forcipulatida. It is one of three families in the order Forcipulatida. Genera The World Register of Marine Species lists these genera within the family Asteriidae (in a field of 6 families): * '' Adelasterias'' Verrill, 1914 * '' Anasterias'' Perrier, 1875 * '' Aphanasterias'' Fisher, 1923 * '' Aphelasterias'' Fisher, 1923 * ''Asterias'' Linnaeus, 1758 * '' Astrometis'' Fisher, 1923 * '' Astrostole'' Fisher, 1923 * '' Caimanaster'' A.M. Clark, 1962 * '' Calasterias'' Hayashi, 1975 * '' Coronaster'' Perrier, 1885 * ''Coscinasterias'' Verrill, 1867 * '' Cryptasterias'' Verrill, 1914 * '' Diplasterias'' Perrier, 1891 * '' Distolasterias'' Perrier, 1896 * '' Evasterias'' Verrill, 1914 * '' Icasterias'' Fisher, 1923 * '' Kenrickaster'' A.M. Clark, 1962 * ''Leptasterias'' Verrill, 1866 * '' Lethasterias'' Fisher, 1923 * '' Lysasterias'' Fisher, 1908 * '' Marthasterias'' Jullien, 1878 * '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astrometis
''Astrometis'' is a genus of sea star in the Asteriidae The Asteriidae are a diverse family of Asteroidea (sea stars) in the order Forcipulatida. It is one of three families in the order Forcipulatida. Genera The World Register of Marine Species lists these genera within the family Asteriidae (in a ... family. The genus has only one undisputed species. The genus occurs from Santa Barbara to the Gulf of California. Species * '' Astrometis californica'' (Verrill, 1914). Status as distinct from ''A. sertulifera'' is disputed * '' Astrometis sertulifera'' Fragile rainbow star (Xantus, 1860) References ITIS Standard Report Page: Astrometis*CalPhotos: Astrometis sertulifera; Fragile Rainbow Star* Asteriidae {{Asteroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tube Feet
Tube feet (technically podia) are small active tubular projections on the oral face of an echinoderm, whether the arms of a starfish, or the undersides of sea urchins, sand dollars and sea cucumbers; they are more discreet though present on brittle stars, and have only a feeding function in feather stars. They are part of the water vascular system. Structure and function Tube feet function in locomotion, feeding, and respiration. The tube feet in a starfish are arranged in grooves along the arms. They operate through hydraulic pressure. They are used to pass food to the oral mouth at the center, and can attach to surfaces. A starfish that is inverted turns one arm over and attaches it to a solid surface, and levers itself the right way up. Tube feet allow these different types of animals to stick to the ocean floor and move slowly. Each tube foot consists of two parts: the ampulla and the podium. The ampulla is a water-filled sac contained in the body of the animal that contain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pedicellariae
A pedicellaria (plural: pedicellariae) is a small wrench- or claw-shaped appendage with movable jaws, called valves, commonly found on echinoderms (phylum Echinodermata), particularly in sea stars (class Asteroidea) and sea urchins (class Echinoidea). Each pedicellaria is an effector organ with its own set of muscles, neuropils, and sensory receptors and is therefore capable of reflex responses to the environment. Pedicellariae are poorly understood but in some taxa, they are thought to keep the body surface clear of algae, encrusting organisms, and other debris in conjunction with the ciliated epidermis present in all echinoderms. In sea stars Types There are two major types of pedicellaria in sea stars: straight and crossed. Straight pedicellaria are typically larger and located on the body surface, whereas crossed pedicellaria are smaller and found more commonly on stalks, raised above the body surface or in clumps circling the spines. The crossed type is connected to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heliaster
''Heliaster'' is a genus of Asteroidea (sea stars) in the family Heliasteridae. Species *''Heliaster canopus'' Perrier, 1875 *''Heliaster cumingi'' (Gray, 1840) *''Heliaster helianthus'' (Lamarck, 1816) *'' Heliaster kubiniji'' Xantus, 1860 *''Heliaster microbrachius'' Xantus, 1860 *''Heliaster polybrachius'' H.L. Clark, 1907 *'' Heliaster solaris'' A.H. Clark, 1920 Fossil record Whole specimens of ''Heliaster microbrachius'' have been found preserved in calcite-cemented quartz in Southwest Florida that dates to the Pliocene The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58 [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
