Aeropsis

	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]
	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]
picture info	Sea Urchin Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to . The spherical, hard shells (tests) of sea urchins are round and spiny, ranging in diameter from . Sea urchins move slowly, crawling with tube feet, and also propel themselves with their spines. Although algae are the primary diet, sea urchins also eat slow-moving (sessile) animals. Predators that eat sea urchins include a wide variety of fish, starfish, crabs, marine mammals. Sea urchins are also used as food especially in Japan. Adult sea urchins have fivefold symmetry, but their pluteus larvae feature bilateral (mirror) symmetry, indicating that the sea urchin belongs to the Bilateria group of animal phyla, which also comprises the chordates and the arthropods, the annelids and the molluscs, and are found in every ocean and in every climate, from the tropics to the pol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]