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Aeropsidae
Aeropsidae is a family of echinoderms belonging to the order Spatangoida. It contains one extant genus. There are also eight extinct genera, most of which fall in the subfamily Corasterinae. History Initially, a large number of genera were included on the basis of their apetaloid Ambulacrum (anatomy), ambulacra. This, however, resulted in the inclusion of a number of unrelated genera some of which are Holasteridae, holasteroid, and others that are Spatangidae, spatangoid. Later, Mortensen included just two genera - ''Aceste'' and ''Aeropsis''. The two forms are very different in test architecture. Aceste is now considered to be an apetaloid derivative of ''Proraster'' and is nor believed to be closely related to Aeropsidae. Genera The following genera are recognised: Subfamily Corasterinae Lambert & Thiéry, 1924 * † ''Coraster'' Cotteau, 1887 * † ''Cordastrum'' Nisiyama, 1968 * † ''Cottreaucorys'' Lambert, 1920 * † ''Homoeaster'' Pomel, 1883 * † ''Lambertiaster'' G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spatangoida
The heart urchins or Spatangoida are an order of sea urchins. Their body is a somewhat elongated oval in form, and is distinguished by the mouth being placed towards one end of the animal, and the anus towards the other. As a result, heart urchins, unlike most other sea urchins, are bilaterally symmetrical, and have a distinct anterior surface. The presence and position of the mouth and anus typically give members of this group the distinct "heart" shape from which they get their name. Heart urchins have no feeding lantern, and often have petaloids sunk into grooves. They are a relatively diverse order, with a number of varying species. Taxonomy According to World Register of Marine Species : * suborder Brissidina Stockley, Smith, Littlewood, Lessios & MacKenzie-Dodds, 2005 ** family Asterostomatidae Pictet, 1857 ** family Brissidae Gray, 1855 ** family Palaeotropidae Lambert, 1896 ** super-family Spatangidea Fischer, 1966 *** family Eupatagidae Lambert, 1905 *** family ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aeropsis
''Aeropsis'' is a genus of sea urchins in the family Aeropsidae Aeropsidae is a family of echinoderms belonging to the order Spatangoida. It contains one extant genus. There are also eight extinct genera, most of which fall in the subfamily Corasterinae. History Initially, a large number of genera were incl .... Two species are recognized: References Spatangoida Echinoidea genera {{echinoidea-stub ... [...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] |
Ambulacrum (anatomy)
In zoology, an ambulacrum is an elongated area of the shell of an echinoderm in which a row of tube feet are arranged. It is pluralized as ''ambulacra''. The area on the shell between ambulacra is known as an interambulacrum Ambulacral is a term typically used in the context of anatomical parts of the phylum Echinodermata or class Asteroidea and Edrioasteroidea. Echinoderms can have ambulacral parts that include ossicles, plates, spines, and suckers. For example, se .... References Echinoderm anatomy {{echinoderm-anatomy-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holasteridae
Holasteridae is an extinct family of sea urchins. These semi-infaunal detritivores lived during the Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of th ... period, from 140.2 to 53.0 Ma. Genera References Holasteroida {{paleo-echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spatangidae
The Spatangidae are a family of heart urchin The heart urchins or Spatangoida are an order of sea urchins. Their body is a somewhat elongated oval in form, and is distinguished by the mouth being placed towards one end of the animal, and the anus towards the other. As a result, heart urch ...s. There are three recognised genera within the family; '' Granopatagus'', '' Plethotaenia'', and '' Spatangus''. Additionally, ''Prospatangus'' was previously a recognised genus within the Spatangidae, but is now accepted as part of the genus ''Spatangus''. The Spatangidae are marine heart urchins that feed on subsurface deposits and graze. References Spatangoida Echinoderm families {{echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aceste
''Aceste'' is a genus of echinoderms belonging to the family Schizasteridae. The genus has almost cosmopolitan distribution In biogeography, cosmopolitan distribution is the term for the range of a taxon that extends across all or most of the world in appropriate habitats. Such a taxon, usually a species, is said to exhibit cosmopolitanism or cosmopolitism. The ext .... Species: *'' Aceste bellidifera'' *'' Aceste ovata'' *'' Aceste weberi'' References Schizasteridae Echinoidea genera {{echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proraster
''Proraster'' is a genus of echinoderms belonging to the family Hemiasteridae Hemiasteridae is a family of echinoderms belonging to the order Spatangoida The heart urchins or Spatangoida are an order of sea urchins. Their body is a somewhat elongated oval in form, and is distinguished by the mouth being placed towards .... The species of this genus are found in Europe, Northern America and Australia. Species: *'' Proraster atavus'' *'' Proraster geayi'' *'' Proraster granti'' *'' Proraster jukesii'' *'' Proraster magnus'' *'' Proraster oedumi'' References Spatangoida Echinoidea genera {{echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
