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Luidia clathrata
''Luidia clathrata'' is a tropical species of starfish in the family Luidiidae. It is variously known as the slender armed starfish, the gray sea star or the lined sea star. It is found in the western Atlantic Ocean.
==Description==
''Luidia clathrata'' is a large, flattish starfish, sometimes growing to a diameter of . It has a relatively small disc and five slender arms, which are two or three times the diameter of the disc. The upper surface of the disc and arms is clad in longitudinal rows of calcified plates called ossicles, and in paxillae, pillar-like spines with flattened summits covered with minute spinules. There are no plates along the margins of the arms, these being replaced by paxillae, but on the underside, the marginal plates are large and themselves covered with paxillae. The tube feet, found in longitudinal rows on the underside, do not have suckers but have two swollen regions. There is a mouth in the centre of the underside, an oesophagus and cardiac stomach which can be everted. The gonads are underneath the sides of each arm.〔(Family Luidiidae ) Marine Species Identification Portal. Retrieved 2011-08-29.〕 The colour is usually grey or light brown but can be tinged with pink. The central row of plates on the upper side of the arms is usually dark grey or black. The underside of the starfish is a paler colour.〔(''Luidia clathrata'' Gray sea star ) Smithsonian Marine Station at Fort Pierce. Retrieved 2012-01-30.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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