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Amphiuridae
Amphiuridae (commonly called long-armed burrowing brittle stars or burrowing brittle stars) are a large family of brittle stars of the suborder Gnathophiurina The Gnathophiurina are a group of Ophiuroidea mostly treated as suborder (but at first as an order Gnathophiurida, and sometimes as infraorder of OphiurinaSmith, A.B.; Paterson, G.L.J. . Ophiuroid phylogeny and higher taxonomy: morphological, .... Some species are used to study echinoderm development (e.g. '' Amphipholis kochii'' and '' Amphioplus abditus'') and bioluminescence (the dwarf brittle star, ''Amphipholis squamata''). Characteristics Amphiuridae are generally small brittlestars. Their jaws are always with two apical papillae at the tip, and one or more papillae on each side. Systematics and phylogeny Amphiuridae are the most diverse family of Ophiurida with over 200 species. The family contains the following genera: In addition, two extinct genera are known: * †'' Deckersamphiura'' Jagt, 2000 * â ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acrocnida
''Acrocnida'' is a genus of brittle stars in the family (biology), family Amphiuridae. The genus contains three members: ''Acrocnida brachiata, Acrocnida semisquamata,'' and ''Acrocnida spatulispina.'' There has also been observed hybridization between both ''Acrocnida brachiata'' and ''Acrocnida spatulispina'.'' It is a fairly common genus, usually found along the coasts of Northwestern Europe, but with some species like semisquamata appearing around West Africa. Members of this genus primarily prefer intertidal and sub-tidal habitats, and they are they are less likely to be found in intertidal areas by comparison. This genus was not officially classified until 1926, by T. Gislén. One study found that due to the increased calcification that ''Acrocnida brachiata'' causes could be a potential source of Carbon Dioxide for not only the warm, shallow environments they live in, but also for the atmosphere. Species The World Register of Marine Species lists the following species. * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brittle Star
Brittle stars, serpent stars, or ophiuroids (; ; referring to the serpent-like arms of the brittle star) are echinoderms in the class Ophiuroidea, closely related to starfish. They crawl across the sea floor using their flexible arms for locomotion. The ophiuroids generally have five long, slender, whip-like arms which may reach up to in length on the largest specimens. The Ophiuroidea contain two large clades, Ophiurida (brittle stars) and Euryalida (basket stars). Over 2,000 species of brittle stars live today. More than 1,200 of these species are found in deep waters, greater than 200 m deep. Range The ophiuroids diverged in the Early Ordovician. Ophiuroids can be found today in all of the major marine provinces, from the poles to the tropics. Basket stars are usually confined to the deeper parts of this range; Ophiuroids are known even from abyssal (>6,000 m) depths. However, brittle stars are also common members of reef communities, where they hide under rocks and even w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dwarf Brittle Star
''Amphipholis squamata'', common names brooding snake star and dwarf brittle star, is a species complexLe Gac, M., Féral, J.P., Poulin, E., Veyret, M. & Chenuil, A. (2004) ''Identification of allopatric clades in the cosmopolitan ophiuroid species complex ''Amphipholis squamata'' (Echinodermata). The end of a paradox?'' Marine Ecology Progress Series, 278: 171–178. of brittle stars in the family Amphiuridae. Description This species is small, grey to bluish-white, and phosphorescent. Brooding individuals emit more light than non-brooding individuals. It has thin, short arms around 20 mm long. The round disc is 3 to 5mm, and has a scale covering with D-shaped radial plates. It has rhombic-shaped mouth shields and extremely wide mouth papillae. Distribution ''Amphipholis squamata'' is found in all parts of the British Isles and also in Ireland. It has been recorded in many other parts of the world, including France,New Zealand and other places, with one conference pape ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amphiodia
''Amphiodia'' is a genus of brittle stars belonging to the family Amphiuridae Amphiuridae (commonly called long-armed burrowing brittle stars or burrowing brittle stars) are a large family of brittle stars of the suborder Gnathophiurina The Gnathophiurina are a group of Ophiuroidea mostly treated as suborder (but at .... Species *'' Amphiodia acutispina'' *'' Amphiodia akosmos'' *'' Amphiodia assimilis'' *'' Amphiodia atra'' *'' Amphiodia crassa'' *'' Amphiodia craterodmeta'' *'' Amphiodia cyclaspis'' *'' Amphiodia debita'' *'' Amphiodia digitata'' *'' Amphiodia digitula'' *'' Amphiodia dividua'' *'' Amphiodia euryaspis'' *'' Amphiodia fissa'' *'' Amphiodia frigida'' *'' Amphiodia fuscoalba'' *'' Amphiodia grisea'' *'' Amphiodia guillermosoberoni'' *'' Amphiodia gyraspis'' *'' Amphiodia habilis'' *'' Amphiodia microplax'' *'' Amphiodia minuta'' *'' Amphiodia obtecta'' *'' Amphiodia occidentalis'' *'' Amphiodia oerstedi'' *'' Amphiodia olivacea'' *'' Amphiodia peloria'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amphiura
''Amphiura'' is a large genus of brittle stars (Ophiuroidea) found in oceans worldwide, from tropics to Arctic and Antarctic regions. Systematics and phylogeny ''Amphiura'' is a large genus that is currently divided into the following six subgenera: ''Amphioplus'', ''Amphiura'', ''Fellaria'', ''Ophionema'', ''Ophiopelte'' and ''Ophiopeltis''. The once used subgenus ''Acrocnida'' has been elevated to a genus rank. The fossil record of the genus dates back to the Turonian ('' Amphiura plana''). Species Extant species include:Branch, G.M., Branch, M.L, Griffiths, C.L. and Beckley, L.E. 2010. ''Two Oceans: a guide to the marine life of southern Africa'' *'' Amphiura acacia'' *'' Amphiura accedens'' *'' Amphiura acrisia'' *'' Amphiura adjecta'' *'' Amphiura aestuarii'' *'' Amphiura affinis'' *'' Amphiura africana'' *'' Amphiura agitata'' *'' Amphiura alba'' *'' Amphiura albella'' *'' Amphiura algida'' *'' Amphiura ambigua'' *'' Amphiura amokurae'' *''Amphiura angularis'' *'' Amphiu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gnathophiurina
The Gnathophiurina are a group of Ophiuroidea mostly treated as suborder (but at first as an order Gnathophiurida, and sometimes as infraorder of OphiurinaSmith, A.B.; Paterson, G.L.J. . Ophiuroid phylogeny and higher taxonomy: morphological, molecular and palaeontological perspectives. Zool. J. Linn. Soc. 114 (1995) or not used at all). Families * Amphilepididae Matsumoto, 1915 * Amphiuridae Ljungman, 1867 * Ophiactidae Matsumoto, 1915 * Ophiocomidae Ljungman, 1867 * Ophionereididae Ophionereididae are a family of brittle star Brittle stars, serpent stars, or ophiuroids (; ; referring to the serpent-like arms of the brittle star) are echinoderms in the class Ophiuroidea, closely related to starfish. They crawl across the ... Ljungman, 1867 * Ophiothricidae Ljungman, 1867 References Ophiurida {{ophiuroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amphipholis Kochii
''Amphipholis'' is a large genus of brittle stars (Ophiuroidea) found in oceans worldwide from tropics to Arctic and Antarctic regions. Some species have been used to study echinoderm development ('' Amphipholis kochii'') and bioluminescence (the dwarf brittle star, ''Amphipholis squamata''). Systematics ''Amphipholis'' is a large genus with potentially many cryptic species. The high variability may be due to common parthenogenetic reproduction. The type species of the genus is ''Amphipholis januarii '' Ljungman, 1866(=''Amphipholis gracillima'' (Stimpson, 1852)). Species include: *'' Amphipholis abdita'' *'' Amphipholis andreae'' *'' Amphipholis bananensis'' *'' Amphipholis clypeata'' *'' Amphipholis elevata'' *'' Amphipholis erecta'' *'' Amphipholis geminata'' *'' Amphipholis goesi'' *'' Amphipholis gracillima'' *'' Amphipholis granulata'' *'' Amphipholis kochii'' *'' Amphipholis laevidisca'' *'' Amphipholis limbata'' *'' Amphipholis linopneusti'' *'' Amphipholis litoralis'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jurassic
The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately 143.1 Mya. The Jurassic constitutes the second and middle period of the Mesozoic, Mesozoic Era as well as the eighth period of the Phanerozoic, Phanerozoic Eon and is named after the Jura Mountains, where limestone strata from the period were first identified. The start of the Jurassic was marked by the major Triassic–Jurassic extinction event, associated with the eruption of the Central Atlantic magmatic province, Central Atlantic Magmatic Province (CAMP). The beginning of the Toarcian Age started around 183 million years ago and is marked by the Toarcian Oceanic Anoxic Event, a global episode of Anoxic event, oceanic anoxia, ocean acidification, and elevated global temperatures associated with extinctions, likely caused by the eruption of the Kar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
