Atelostomata

	Atelostomata The Atelostomata are a type of sea urchins. They are distinguished from other sea urchins by their irregular shape and the absence of a feeding lantern. The group includes the well known heart urchins, as well as some less familiar and extinct forms. List of orders * order '' Holasteroida'' (Durham & Melville, 1957) * order '' Spatangoida'' (L. Agassiz, 1840) References * * Echinoidea Animal superorders {{echinoidea-stub ... [...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 po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Echinoidea 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Echinocardium ''Echinocardium'' is a genus of sea urchins of the family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ... Loveniidae, known as heart urchins. Species * '' Echinocardium australe'' Gray, 1855 * '' Echinocardium cordatum'' ( Pennant, 1777) * '' Echinocardium fenauxi'' Péquignat, 1963 * '' Echinocardium flavescens'' ( Müller, 1776) * '' Echinocardium gibbosus'' Agassiz & Desor, 1847 * '' Echinocardium intermedium'' Mortensen, 1907 * '' Echinocardium laevigaster'' Agassiz * '' Echinocardium mediterraneum'' (Forbes, 1844) * '' Echinocardium mortenseni'' Thiéry, 1909 * '' Echinocardium pennatifidum'' Norman, 1868 * '' Echinocardium sebae'' Gray References * Spatangoida Taxa named by John Edward Gray {{echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Holasteroida Holasteroida is an order of irregular sea urchins. Characteristics These irregular sea urchins are characterized by a particularly marked bilateral symmetry, including for the apical system, which is highly elongated. In some contemporary abyssal groups such as Pourtalesiidae, some species are even bottle-shaped. The mouth (peristome) does not contain an Aristotle's lantern. The anus (periproct) has migrated towards the periphery of the test. The plastron is never amphisternous. Image:MHNT - Hemipneustes pyrenaicus - 1.jpg, Fossile of '' Hemipneustes pyrenaicus'' ( Hemipneustidae, Maastrichtian) Image:Echinosigra amphora.jpg, '' Echinosigra amphora'' ( Pourtalesiidae) This order seems to have appeared at the lower Cretaceous. List of families According to World Register of Marine Species : * Family Hemipneustidae (Lambert, 1917) † genus '' Hemipneustes'' L. Agassiz, 1835 † genus '' Medjesia'' Jeffery, 1997 † genus '' Opisopneustes'' Gauthier, 1889 � ... [...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]