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Antedon bifida
''Antedon bifida'' is a species of crinoid in the family Antedonidae commonly known as the rosy feather star. It is found in north west Europe.
==Description==
The body of ''A. bifida'' is a concave disc surrounded by ten pinnately divided arms giving it a fern-like appearance. The mouth and ambulacral grooves are on the upper surface of the disc. The arms can be up to 10cm (4in) long but are usually shorter than this. The undersides of the arms have prominent transverse ridges and some have modifications for feeding and reproduction. The pinnules are jointed, have about 35 segments and bear unequal sized tube feet in groups of three. The arm colour is variable, ranging from yellow or pink to deep purple, sometimes spotted or blotched, and the pinnules are usually paler or white. There are about twenty short cirri, banded and arranged in transverse rows on a central raised ossicle. These curl under and grasp the surface enabling the animal to crawl around which it can do with great rapidity. It may be confused with the rather similar ''Antedon petasus'' but that species is usually larger with up to 50 cirri, looks neater and does not have ridges on the undersides of its arms.〔(Feather Star (''Antedon bifida'') ) Marine Species Identification Portal. Retrieved 2011-10-14.〕〔(''Antedon bifida'' (Pennant, 1777) ) National Museums of Northern Ireland. Retrieved 2011-10-14.〕〔(Rosy feather-star - ''Antedon bifida'' ) Marine Life Information Network (MarLIN). Retrieved 2011-10-14.〕
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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