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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Archaster typicus ： ウィキペディア英語版 Archaster typicus ''Archaster typicus'' is a species of starfish in the family Archasteridae. It is commonly known as the sand star or the sand sifting star but these names are also applied to starfish in the genus ''Astropecten''. It is found in shallow waters in the Indo-Pacific region. ==Description== ''Archaster typicus'' is a five-limbed star with long, slightly tapering arms with pointed tips. Occasionally three, four, or even six-armed individuals occur. Adults grow to in diameter, with males often being smaller than females. This starfish is adapted to life on the sandy seabed, where it buries in the sediment during high tides and moves over the sediment surface during low tides. The general colour is grey or brownish, variously marked with darker and lighter patches, sometimes forming a chevron pattern. The underside is pale. The body is slightly inflated and there is a whitish madreporite near the centre of the disc. The small armour plates that cover the upper surface of the arms are lined up in neat parallel rows which distinguishes it from the rather similar ''Astropecten polyacanthus'' which has similar habits and colouring. The spines, arranged in a marginal fringe, are short, flat and blunter than ''A. polyacanthus'' and the tube feet have suckers and not points.〔(Telling Apart Sand Stars: ''Archaster'' vs. ''Astropecten''! Two Common Trade Species ) Echinoblog. Retrieved 2012-04-08.〕〔(Common Sea Star – ''Archaster typicus'' ) WildSingapore. Retrieved 2012-04-08.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Archaster typicus」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.