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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 Allonautilus perforatus ： ウィキペディア英語版 Allonautilus perforatus ''Allonautilus perforatus'' is a species of nautilus native to the waters around Bali, Indonesia. It is known only from drifted shells and, as such, is the least studied of the six recognised nautilus species. ''A. perforatus'' shows a shell shape and coloration very similar to that of ''A. scrobiculatus'' and shares with this species the characteristic open umbilicus.〔Ward, P.D. & W.B. Saunders 1997. (''Allonautilus'': a new genus of living nautiloid cephalopod and its bearing on phylogeny of the Nautilida ). ''Journal of Paleontology'' 71(6): 1054–1064.〕 However, it bears highly distinctive shell-ribbing, which is unique among extant ectocochliate cephalopods, and lacks scrobiculate shell sculpture. It is not known whether ''A. perforatus'' possesses the thick encrusting layer (periostracum) characteristic of ''A. scrobiculatus''. Maximum known shell diameter is around 180 mm.〔Jereb, P. 2005. Family Nautilidae. ''In:'' P. Jereb & C.F.E. Roper, eds. ''Cephalopods of the world. An annotated and Illustrated catalogue of species known to date. Volume 1. Chambered nautiluses and sepioids (Nautilidae, Sepiidae, Sepiolidae, Sepiadariidae, Idiosepiidae and Spirulidae)''. FAO Species Catalogue for Fishery Purposes. No. 4, Vol. 1. Rome, FAO. pp. 51–55.〕 ==References== 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「Allonautilus perforatus」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.