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Articulata (Crinoidea)
Articulata are a subclass or superorder within the class Crinoidea, including all living crinoid species. They are commonly known as sea lilies (stalked crinoids) or feather stars (unstalked crinoids). The Articulata are differentiated from the extinct subclasses by their lack of an anal plate in the adult stage and the presence of an entoneural system. Articulata first appeared in the fossil record during the Triassic period although other, now extinct crinoid groups, originated in the Ordovician. Characteristics Articulata exhibit pentamerous symmetry. The stalk, which consists of numerous disks held together by ligaments, supports a calyx or cup made of circlets of calcerous plates. In Comatulids, the stalk develops following the larval stage, but the juveniles shed all but the topmost disk to take up a free-living existence. Five often branched arms, which consist of articulated series of ossicles, extend from the oral plate and form the food-capture mechanism of Articulata. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ptilometra Australis
''Ptilometra australis'', the passion flower feather star, is a species of crinoid. It is native to the coasts of southeastern Australia where it is found on reefs, in estuaries, and bays at depths down to about . Description The passion flower feather star is a robust crinoid with a diameter of about when fully extended. It has eighteen to twenty jointed arms which can be coiled up when the animal is not feeding. These are attached to a cup-shaped body or Calyx (anatomy), calyx. The arms are edged by feathery appendages known as pinnules. Each pinnule has rows of tube feet on either side of a central ambulacral groove lined with Cilium, cilia. This groove is continuous with the central groove on the arm which leads to the mouth at the centre of the calyx. The aboral (lower) surface of the crinoid has several hooked appendages called Cirrus (biology), cirri which grip onto the Substrate (biology), substrate, which may be a rock, a sponge, a coral or sea fan. The colour of this cr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentametrocrinidae
Pentametrocrinidae is a family of echinoderms belonging to the order Comatulida Comatulida is an order of crinoids Crinoids are marine invertebrates that make up the class Crinoidea. Crinoids that remain attached to the sea floor by a stalk in their adult form are commonly called sea lilies, while the unstalked forms, c .... Genera: * '' Pentametrocrinus'' Clark, 1908 * '' Thaumatocrinus'' Carpenter, 1883 References Comatulida Echinoderm families {{crinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aporometridae
Aporometridae is a monotypic family of crinoids, the only genus being ''Aporometra'', which contains three species, all endemic to the seas around Australia. Description Members of this family have five arms which subdivide near the base giving them ten arms in total. The arms can reach in length and at the base of the calyx there are up to 25 cirri, often longer than the arms. Unique among Comatulida, the cirri are flattened on the underside. The gonads are located on the pinnules and not on the arms, and the embryos are brooded in cavities in the arms. Species 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 catalogue and list of names of marine organisms. Content The content of the registry is edited and maintained by scien ... lists the following species in this genus: * '' Aporometra occidentalis'' HL Clark, 1938 * '' Aporometra paedophora'' (HL Clark ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zygometridae
''Zygometridae'' is a family of echinoderms belonging to the order Comatulida Comatulida is an order of crinoids Crinoids are marine invertebrates that make up the class Crinoidea. Crinoids that remain attached to the sea floor by a stalk in their adult form are commonly called sea lilies, while the unstalked forms, c .... Genera: * '' Catoptometra'' Clark, 1908 * '' Zygometra'' Clark, 1907 References Comatulida Echinoderm families {{crinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mariametridae
Mariametridae is a family of echinoderms belonging to the order Comatulida Comatulida is an order of crinoids Crinoids are marine invertebrates that make up the class Crinoidea. Crinoids that remain attached to the sea floor by a stalk in their adult form are commonly called sea lilies, while the unstalked forms, c .... Genera: * '' Dichrometra'' Clark, 1909 * '' Lamprometra'' Clark, 1913 * '' Mariametra'' Clark, 1909 * '' Oxymetra'' Clark, 1909 * '' Pelometra'' Clark, 1941 * '' Stephanometra'' Clark, 1909 References Echinoderm families {{crinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Himerometridae
Himerometridae is a family of echinoderms belonging to the order Comatulida Comatulida is an order of crinoids Crinoids are marine invertebrates that make up the class Crinoidea. Crinoids that remain attached to the sea floor by a stalk in their adult form are commonly called sea lilies, while the unstalked forms, c .... Genera: * '' Amphimetra'' Clark, 1909 * '' Craspedometra'' Clark, 1909 * '' Heterometra'' Clark, 1909 * '' Himerometra'' Clark, 1907 * '' Homalometra'' Clark, 1918 References Echinoderm families {{crinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eudiocrinidae
Eudiocrinidae is a family of echinoderms belonging to the order Comatulida Comatulida is an order of crinoids Crinoids are marine invertebrates that make up the class Crinoidea. Crinoids that remain attached to the sea floor by a stalk in their adult form are commonly called sea lilies, while the unstalked forms, c .... The only genus is ''Eudiocrinus''. References Comatulida Crinoid genera {{crinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colobometridae
''Colobometridae'' is a family of crinoids belonging to the order Comatulida. Members of this order are known as feather stars. Genera Genera within this family include: * '' Alisometra'' A.H. Clark, 1947 * '' Analcidometra'' A.H. Clark, 1918 * '' Austrometra'' A.H. Clark, 1916 * '' Basilometra'' A.H. Clark, 1936 * ''Cenometra'' A.H. Clark, 1911 * '' Clarkometra'' Gislén, 1922 * '' Colobometra'' A.H. Clark, 1909 * '' Cotylometra'' A.H. Clark, 1916 * '' Cyllometra'' A.H. Clark, 1907 * '' Decametra'' A.H. Clark, 1911 * '' Embryometra'' Gislén, 1938 * '' Epimetra'' A.H. Clark, 1911 * '' Gislenometra'' A.H. Clark, 1947 * '' Iconometra'' A.H. Clark, 1929 * '' Oligometra'' A.H. Clark, 1908 * '' Oligometrides'' A.H. Clark, 1918 * '' Petasometra'' A.H. Clark, 1912 * '' Pontiometra'' A.H. Clark, 1907 Image:Analcidometra armata 248728240.jpg, '' Analcidometra armata'' Image:Cenometra bella.jpeg, ''Cenometra bella ''Cenometra bella'' is a species of crinoids belonging to the genus '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comatulidae
Comatulidae is a family of comatulid crinoids. Since 2015, it replaces the family Comasteridae. Description and characteristics This family is of recent restoration, and still has no consensual description. However the description of the family Comasteridae remains partially valid. This family counts between 93 and 95 species, distributed in 21 genera, which makes it the second most diversified family of crinoids the behind Antedonidae, representing approximately 1/6th of known crinoid species. It contains most of the big species of shallow tropical feather stars, in particular in the Indo-Pacific. List of genera This family has been recently restored following genetic works from Charles Messing's team. It contains the following genera: * subfamily Comatellinae Summers, Messing, Rouse, 2014 ** genus '' Alloeocomatella'' Messing, 1995 -- 2 species ** genus '' Comatella'' AH Clark, 1908 -- 2 species ** genus '' Davidaster'' Hoggett & Rowe, 1986 -- 2 species ** genus '' N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |