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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 Phormosoma placenta ： ウィキペディア英語版 Phormosoma placenta ''Phormosoma placenta'' is a species of sea urchin in the order Echinothurioida. It is a deep water species, seldom being found at depths less than , and occurs on either side of the Atlantic Ocean on the continental slope. ==Description== ''Phormosoma placenta'' is a yellowish-brown colour and can grow to a diameter of . The flexible test is dome shaped above and flattened beneath. The plates from which the test is made overlap each other and are bound together by a membranous connection. Specimens removed from the water usually collapse into disc shapes. The upper (aboral) surface has few primary tubercles and spines but the lower (oral) surface is densely covered in perforate tubercles from which slender, club-shaped spines project, each one embedded in a membranous sac. These spines articulate with the tubercles and are used to support the animal and also in locomotion. Observations of live individuals on the seabed show that the few spines on the aboral surface are also enclosed in large membranous sacs but these are usually destroyed in bringing the animal to the surface. 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「Phormosoma placenta」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.