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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 Ectenolites ： ウィキペディア英語版 Ectenolites ''Ectenolites'' is a genus of small, slender, cylindrial Ellesmeroceratids that resemble ''Ellesmeroceras'' but are smaller and proportionally narrower. Septa, as typical for ellesmerocerids, are close spaced with shallow lobes on either flank. The body chamber is proportionally long, the shell itself slightly compressed. The dorsal side at the beginning of the shell, opposite the aperture and body chamber, is strongly convex so to produce a sense of endogastric curvature with the apex and siphuncle aligned.〔Flower R.H.1964, The Nautiloid Order Ellesmeroceratida (Cephalopoda). Memoir 12, New Mexico Bureau of Mines and Mineral Resources, Socorro, NM〕 The siphuncle in ''Ectenolites'' lies along the ventral side; is tubular, composed of short orthochoantic septal necks and thick concave connecting rings. The posterior portion is filled with irregularly spaced transverse diaphragms.〔 ''Ectenolites'' is one of two ellesmeroceratid genera known to have passed from the Late Cambrian into the Early Ordovician〔Chen, J. Y.; Teichert, C.(1983). Cambrian Cephalopods. Geology v. 11 pp. 647–650 Nov 1983〕 (Gasconadian) and is found widespread in North America from the Tribes Hill of New York to the Tanyard of Texas. ==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「Ectenolites」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.