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Velatida
The Velatida are an order of sea stars containing about 200 species in five families. These sea stars normally have thick bodies with large discs. Description and characteristics This order contains mostly deep or cold seas sea stars, often with a wide distribution (sometimes global). They have a pentagonal or star shape, with between 5 and 15 arms. Their skeleton is weakly developed, which confers them a good flexibility, and numerous papillae on the aboral surface allow them to breathe in poorly oxygenated waters. Their pedicellariae are often provided with spines. The smallest are Caymanostellidae (between 0,5 and 3 cm) and the biggest Pterasteridae (up to 30 cm). Taxonomy New molecular evidence now suggests a relationship between some velatid and valvatid families. List of families according to World Register of Marine Species: * Caymanostellidae Belyaev, 1974 * Korethrasteridae Danielssen & Koren, 1884 * Myxasteridae Perrier, 1885 * Pterasteridae Perrier, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Star
Starfish or sea stars are Star polygon, star-shaped echinoderms belonging to the class (biology), class Asteroidea (). Common usage frequently finds these names being also applied to brittle star, 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, tropics, tropical zones to frigid, polar regions of Earth, polar regions. They are found from the intertidal zone down to abyssal zone, 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 fee ... [...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] |
Korethrasteridae
Korethrasteridae is a family of starfish in the order Velatida. It contains the following genera and species: * Genus '' Korethraster'' ** '' Korethraster hispidus'' * Genus '' Peribolaster'' ** '' Peribolaster biserialis'' ** '' Peribolaster folliculatus'' ** '' Peribolaster lictor'' ** '' Peribolaster macleani'' * Genus ''Remaster Remaster refers to changing the quality of the sound or of the image, or both, of previously created recordings, either audiophonic, cinematic, or videographic. The terms digital remastering and digitally remastered are also used. Mastering A ...'' ** '' Remaster gourdoni'' ** '' Remaster palmatus'' References Velatida Echinoderm families {{asteroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Myxasteridae
Myxasteridae is a family of deep-sea velatid sea stars containing nine species in three genera. Taxonomy List of families according to World Register of Marine Species: * genus '' Asthenactis'' Fisher, 1906 ** '' Asthenactis australis'' McKnight, 2006 ** '' Asthenactis fisheri'' Alton, 1966 ** '' Asthenactis papyraceus'' Fisher, 1906 * genus '' Heligmaster'' Mah, 2022 ** '' Heligmaster kanaloa'' Mah, 2022 ** '' Heligmaster pele'' Mah, 2022 * genus '' Myxaster'' Perrier, 1885 ** '' Myxaster medusa'' (Fisher, 1913) ** '' Myxaster perrieri'' Koehler, 1896 ** '' Myxaster sol'' Perrier, 1885 * genus ''Pythonaster'' Sladen in Thomson & Murray, 1885 ** ''Pythonaster atlantidis'' A.H. Clark, 1948 ** ''Pythonaster murrayi'' Sladen, 1889 ** ''Pythonaster pacificus'' Downey, 1979 Image:Asthenactis papyraceus.jpg, '' Asthenactis papyraceus'' Image:Kanaloa-hires.jpg, '' Heligmaster kanaloa'' Image:Myxaster.jpg, '' Myxaster sp.'' Image:Pythonaster Hawaii.jpg, ''Pythonaster ''Pythonaster' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Myxaster
''Myxaster'' is a genus of deep-sea velatid sea stars containing three species. Taxonomy List of species according to World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms. Content The content of the registry is edited and maintained by scientific specialist ...: * '' Myxaster medusa'' (Fisher, 1913) * '' Myxaster perrieri'' Koehler, 1896 * '' Myxaster sol'' Perrier, 1885 References Velatida {{Asteroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caymanostellidae
Caymanostellidae is a family of sea stars containing six species in two families. These asteroids normally have thick bodies with large discs. Taxonomy List of families according to World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms. Content The content of the registry is edited and maintained by scientific specialis ...: * '' Belyaevostella'' Rowe, 1989 ** '' Belyaevostella hispida'' (Aziz & Jangoux, 1984) ** '' Belyaevostella hyugaensis'' Fujita, Stampanato & Jangoux, 1994 * '' Caymanostella'' Belyaev, 1974 ** '' Caymanostella admiranda'' Belyaev & Litvinova, 1977 ** '' Caymanostella madagascariensis'' Belyaev & Litvinova, 1991 ** '' Caymanostella phorcynis'' Rowe, 1989 ** '' Caymanostella spinimarginata'' Belyaev, 1974 References Velatida Echinoderm families {{Asteroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pterasteridae
Pterasteridae is a family of sea stars in the order Velatida, consisting of eight genera. Description and characteristics Pterasterids are primarily deep-water, and have an inflated aboral surface. Like many other members of the ordo Velatida, they have a hole in the middle of the central disc called "osculum", from which they can expel mucus for defending against predators. Many species brood their young in an internal chamber flushed with seawater. Fossil pterasterids have been found as early as the upper Campanian of the Cretaceous period. Genera According to the World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms. Content The content of the registry is edited and maintained by scientific specialist ... : * '' Amembranaster'' Golotsvan, 1998 -- 1 species * '' Benthaster'' Sladen, 1882 -- 3 species * '' Calyptraster'' Sladen, 1882 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pteraster Capensis
''Pteraster capensis'' is a species of echinoderm belonging to the family Pterasteridae Pterasteridae is a family of sea stars in the order Velatida, consisting of eight genera. Description and characteristics Pterasterids are primarily deep-water, and have an inflated aboral surface. Like many other members of the ordo Velatida, .... The species is found in Southern Africa. References Pterasteridae Animals described in 1847 Invertebrates of Africa {{asteroidea-stub ... [...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] |
Eleutherozoa
Eleutherozoa is a proposed subphylum of echinoderms. They are mobile animals with the mouth directed towards the substrate. They usually have a madreporite, tube feet, and moveable spines of some sort, and some have Tiedemann's bodies on the ring canal. All living echinoderms except Crinozoa and Blastozoa belong here. Systematics There are 2 main competing hypotheses about the internal subdivision, both about equally well supported by both molecular and morphological data. They differ in their placement of the Ophiuroidea (brittle stars), and are named accordingly. The "Cryptosyringida" hypothesis posits that the "sea-star" morphology is plesiomorphic for Eleutherozoa as a whole, and that starfish (Asteroidea) and brittle stars are not very closely related, the latter forming the clade Cryptosyringida together with the Echinozoa. The "Asterozoa" hypothesis, on the other hand, implies that the "sea-star" arms of starfish and brittle stars, as well as the rounded shape of Echinoz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Order (biology)
Order ( la, wikt:ordo#Latin, ordo) is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between Family_(biology), family and Class_(biology), class. In biological classification, the order is a taxonomic rank used in the classification of organisms and recognized by the nomenclature codes. An immediately higher rank, superorder, is sometimes added directly above order, with suborder directly beneath order. An order can also be defined as a group of related families. What does and does not belong to each order is determined by a taxonomist, as is whether a particular order should be recognized at all. Often there is no exact agreement, with different taxonomists each taking a different position. There are no hard rules that a taxonomist needs to follow in describing or recognizing an order. Some taxa are accepted almost universally, while others are recognized only rarely. The name of an order is usually written with a capital letter. Fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
