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Paratornoceratinae is a subfamily of oxyconic dimeroceratids included in the order Goniatitida, a group of Paleozoic ammonoids, which have closer affinity to living coleoids than to ''Nautilus''. Paratornoceratinae as defined by Ebbighausen, Becker, & Bockwinkel in 2002 comprises three recognised genera with sharp, oxyconic, venters; ''Acrimeroceras'', ''Paratornoceras'', and ''Polonites''. The shell, as described for the type, ''Paratornoceras'', is subglobular and evolute on young stages, but discoidal and with closed umbilicus in the adult. ==References== * Ebbighausen, V., Becker, R.T. & Bockwinkel, J. (2002): Morphometric Analyses and Taxonomy of oxyconic Goniatites (Paratornoceratinae n. subfam.)... Proceeding of the Geological Survey, 57, Vienna, 2002. *(The Paleobiology Database Paratornoceratinae entry ) *(Paratornoceratinae in Goniat - Taxonomy ) 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「Paratornoceratinae」の詳細全文を読む スポンサード リンク
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