Irregularia

	Irregularia Irregularia is an extant infraclass of sea urchins that first appeared in the Lower Jurassic. Description and characteristics These particular sea urchins are distinguished from other sea urchins by their irregular shape: the anus and often even the mouth are no more at the two poles of the test, creating a bilateral symmetry instead of the classical 5-fold symmetry of echinoderms. The group includes the well known heart urchins, as well as flattened sand dollars, sea biscuits and some other forms. Most of them live inside the sediment, moving in thanks to their particular spines, and feed on its organic fraction. Image:Heart urchin Spatangoida 1380049 Nevit.jpg, Image:Echinocyamus pusillus.jpg, Image:Keyhole sand dollar 01.jpg, Image:Live Sand Dollar trying to bury itself in beach sand.jpg, Image:Clypeaster reticulatus both sides.jpg, Image:Encope emarginata (Leske, 1778) derivate 2013.jpg, Image :Clypeaster rosaceus (Linnaeus, 1758) derivate 2013.jpg, Image:Clyp ... [...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]
picture info	Clypeaster Reticulatus ''Clypeaster reticulatus'', the reticulated sea biscuit, is a species of sea urchin in the Family Clypeasteridae. This species was first scientifically described in 1758 by Carl Linnaeus. It lives on the sandy seabed of shallow seas, semi-immersed in the sediment. Description The reticulated sea biscuit can grow to a length of about . Like all sea biscuits it is bilaterally symmetrical and tends to be rather irregular in shape. It has a solid but slightly rounded aboral (upper) surface. The ambulacral areas on the aboral surface are characteristically shaped like petals and are at least two-thirds the width of the test. These are long and inflated, the front one being the longest and the foremost pair being the shortest. The oral (under) surface is concave or cup-shaped, with the food grooves being indistinct and only slightly indented. The anus is located on the underside near the margin at the back. Live specimens are yellowish-grey, often with darker markings, while bare tes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Clypeaster Rosaceus ''Clypeaster rosaceus'', the fat sea biscuit, is a species of sea urchin in the family Clypeasteridae. It occurs in shallow water in the western Atlantic Ocean and was first scientifically described in 1758 by Carl Linnaeus. Description This is a very large sea biscuit with a strong inflated test, growing to a maximum length of around . In shape it is ovate to slightly pentagonal, with the margin thicker at the anterior end. The petaloid area is broad, the anterior (front) petal being longer than the two posterior, paired petals, which are all of equal length; the area between the pores is wide and raised above the rest of the aboral (upper) surface. The oral (under) surface is fairly flat, with a deep depression around the mouth, and with deeply indented food grooves. The anus is on the oral surface near the posterior margin. The spines are short and coarse. When alive, this species is a dark brown colour, while the bare test is whitish. Image:Clypeaster rosaceus (Linnaeus, ... [...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]
	Echinolampas Ovalis M Eocene Civrac-en-Médoc France Oral ''Echinolampas'' is a genus of echinoderms belonging to the family Echinolampadidae. The genus has cosmopolitan distribution. Species: '' Echinolampas africana'' '' Echinolampas aldrichi'' '' Echinolampas alexandri'' '' Echinolampas altissima'' '' Echinolampas anceps'' '' Echinolampas andalusiensis'' '' Echinolampas anguillae'' '' Echinolampas antunesi'' '' Echinolampas appendiculatus'' '' Echinolampas atascaderensis'' '' Echinolampas atropha'' '' Echinolampas barcensis'' '' Echinolampas bastai'' ''Echinolampas bombos'' '' Echinolampas bonomii'' '' Echinolampas bothriopygoides'' '' Echinolampas brachytona'' ''Echinolampas camagueyensis'' ''Echinolampas caranoi'' ''Echinolampas castroi'' ''Echinolampas cavaionensis'' ''Echinolampas checchiai'' ''Echinolampas chiesai'' ''Echinolampas chuni'' ''Echinolampas clevei'' ''Echinolampas cojimarensis'' ''Echinolampas complanatus'' ''Echinolampas concavus'' '' Echinolampas consola ... [...More Info...] [...Related Items...] OR:* [Wikipedia] [Google] [Baidu]
	Scutella Subrotunda (Leske, 1778) Scutellum may refer to: Scutellum (insect anatomy), a term used in the anatomy of arthropods Scutellum (botany) The Scutellum is part of the structure of a barley and rice seed—the modified seed leaf. The scutellum (from the Latin ''scutella'' meaning "small shield") can also refer to the equivalence of a thin cotyledon in monocots (especially members of t ..., a term used in the morphology of grasses * ''Scutellum'' (trilobite), a genus of trilobites See also * ''Scutella'' (genus), a prehistoric echinoid genus {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Echinolampas Ovalis M Eocene Civrac-en-Médoc France ''Echinolampas'' is a genus of echinoderms belonging to the family Echinolampadidae. The genus has cosmopolitan distribution. Species: '' Echinolampas africana'' '' Echinolampas aldrichi'' '' Echinolampas alexandri'' '' Echinolampas altissima'' '' Echinolampas anceps'' '' Echinolampas andalusiensis'' '' Echinolampas anguillae'' '' Echinolampas antunesi'' '' Echinolampas appendiculatus'' '' Echinolampas atascaderensis'' '' Echinolampas atropha'' '' Echinolampas barcensis'' '' Echinolampas bastai'' ''Echinolampas bombos'' '' Echinolampas bonomii'' '' Echinolampas bothriopygoides'' '' Echinolampas brachytona'' ''Echinolampas camagueyensis'' ''Echinolampas caranoi'' ''Echinolampas castroi'' ''Echinolampas cavaionensis'' ''Echinolampas checchiai'' ''Echinolampas chiesai'' ''Echinolampas chuni'' ''Echinolampas clevei'' ''Echinolampas cojimarensis'' ''Echinolampas complanatus'' ''Echinolampas concavus'' '' Echinolampas consolatio ... [...More Info...] [...Related Items...] OR:* [Wikipedia] [Google] [Baidu]