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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 Pisaster ochraceus ： ウィキペディア英語版 Pisaster ochraceus ''Pisaster ochraceus'', generally known as the purple sea star, ochre sea star, or ochre starfish, is a common starfish found among the waters of the Pacific Ocean. Identified as a keystone species, ''Pisaster'' is considered an important indicator for the health of the intertidal zone.〔Power, Mary E., et al. "Challenges in the quest for keystones." BioScience 46.8 (1996): 609-620.〕 ==Description== This sea star has five stout rays that range in length from 10 to 25 centimeters (4 to 10 in). The rays are arranged around an ill-defined central disk. While most individuals are purple, they can be orange, orange-ochre, yellow, reddish, or brown. The aboral surface contains many small spines (ossicles) that are arranged in a netlike or pentagonal pattern on the central disk. The ossicles are no higher than 2 mm.〔Kozloff, E. N. (1996). Marine Invertebrates of the Pacific Northwest. Seattle: University of Washington Press.〕〔McFadden, M. (2002). Pisaster ochraceus. Retrieved May 10, 2010, from http://www.wallawalla.edu/academics/departments/biology/rosario/inverts/Echinodermata/Class%20Asteroidea/Pisaster_ochraceus.html〕 In ''Pisaster'' the tube feet have suckers on their distal ends which allow them to attach to the rocky substrate and live in heavily wave-swept areas.〔 Two species that can be mistaken for ''Pisaster ochraceus'' are ''Pisaster giganteus'', which has blue rings around white or purple spines, and ''Pisaster brevispinus'', which is pink with small white spines. These two species have different aboral spines and coloration which allows one to distinguish between the species. ''Evasterias troscheli'' may be confused with ''Pisaster ochraceus'' at times as well. It can be distinguished by its smaller disk size and longer, tapering rays which are often thickest a short distance out from their base rather than at the base as in ''Pisaster ochraceus''.〔 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「Pisaster ochraceus」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.