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Marthasterias : ウィキペディア英語版 | Marthasterias
''Marthasterias'' is a genus of starfish in the family Asteriidae. It is monotypic and the only species in the genus is ''Marthasterias glacialis'', commonly known as the spiny starfish. It is native to the eastern Atlantic Ocean. ==Description==
''Marthasterias glacialis'' is a fairly large starfish with a small central disc and five slender, tapering arms. Each arm has three longitudinal rows of conical, whitish spines, usually with purple tips, each surrounded by a wreath of pedicellariae. The background colour is variable and may be brownish or greenish-grey, tinged with yellow or red and sometimes with purple at the tips of the arms. This species can grow to but a more usual size is . It is sometimes confused with the northern starfish ''Leptasterias muelleri''.〔(【引用サイトリンク】title=Spiny starfish - ''Marthasterias glacialis'' )〕
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