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Eudistylia polymorpha
''Eudistylia polymorpha'', the giant feather duster worm, is a species of marine polychaete worm belonging to the family Sabellidae. Its common name is from the crown of tentacles extended when the animal is under water.
==Description==
''E. polymorpha'' has a body up to long and 1.2 cm (0.5 in) thick and lives within a tube. This is parchment-like and composed of sediment cemented with mucus. It is a brownish colour, translucent and often strengthened with sand and shell fragments. On rocky shores, it may be hidden in a crevice and difficult to dislodge. The branchiae (feeding appendages) in the feathery crown also function as gills. They are also known as radioles, and are a shade of red or brown, banded with paler sections. Shades vary, but the most frequent colouration is maroon with orange tips. They arise from two spiral, deeply cleft, bases.〔(Intertidal Marine Invertebrates of the South Puget Sound )〕 They bear eyespots which alert them to sudden shadows or movements nearby. This enables the crown to be retracted into the tube very rapidly when danger threatens. The posterior segments of the worm bear hooked bristles which help anchor it in its tube.〔(San Francisco Bay )〕 ''E. polymorpha'' can be distinguished from the very similar ''Eudistylia vancoveri'' by the cleft in the crown. Also, ''E. vancoveri'' generally has red branchiae with white tips.〔(Animal Diversity Web )〕
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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