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The Aipocerataceae is a superfamily within the Order Nautilida characterized by rapidly expanding, smooth to ribbed, cyrtoconic to coiled shells with rounded or sometimes dorsally flattened or impressed whorls, nearly straight sutures, and a ventral and marginal siphuncle. Septal necks are orthochoantic ventrally and orthochoantic or cyrtochoanitic dorsally. (Kummel 1964, p. K440) The Aipocerataceae is the Solenochilida Flower in Flower and Kummel 1950 and is the Solenocheilaceae which Shimansky included in his Rutoceratina minus the Litogyroceratidae which the Treatise (Kummel 1964, p. K418 ) includes in the Rutoceratidae (Tainocerataceae) The Aipocerataceae includes three families and at least 9 genera. The families are the AipoceratidaeHyatt 1883, Solenochilidae Hyatt 1893, and Scyphoceratidae Ruzhentsev & Shimansky 1954 (Kummel 1964 pp K440 -K442) The Aipoceratidae are represented by the loosely coiled, compressed and gyroconic ''Aipoceras'' from the Lower Carboniferous (Miss) of Europe and North America; the Solenochilidae by the tightly coiled comopolitan ''Solenochilis'' from the Upper Carboniferous (Penn)- Lower Permian, with spines projecting straight out laterally from the umbilical region; Scyphoceratidae by ''Scyphoceras'' from the Lower Permian of the Urals which has a ribbed shell and a relatively small and sharply curved phragmocone. The derivation of the Aipocerataceae is somewhat tenuous. Kummel (1964, K385 fig. 280) shows a tentative connection to the Rutoceratidae in the Devonian. Flower in Flower and Kummel 1950 also shows a tentative connection but from the equivalent Solenochilida to the Barrndeocerida. Shimansky on the other hand (fig 281, K287, Kummel 1964) shows a direct connection from the Solenocheilaceae to the Rutoceratidae. ==''References''== * Flower & Kummel 1950. A Classification of the Nautiloidea; Journal of Paleontology, V.24, n.5, pp604–616,Sept 1950. * Kummel, B. 1964. Nautiloidea - Natilida; Treatise on Inertebrate Paleontology part K; Geological Society of America and University of Kansas Press. :see also (Paleobiology Database ) 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「Aipocerataceae」の詳細全文を読む スポンサード リンク
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