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''Acrimeroceras'' is an oxyconic Devonian gonitite and one of three genera included in the subfamily Paratornoceratinae. The others being ''Paratornoceras'' and ''Paratoceras'' or ''ex'' ''Polonites''. ''Acrimeroceras'' has a shell like that of ''Paratornoceras'' with biconvex growth lines and constrictions and simple dorsal lobe. The adult shell is extremely compressed, smooth, oxyconic to lanceolate in section. Early growth stages are depressed, subglobular, smooth or ribbled, with an open umbilcus and rounded to suboxyconic venter, which sharpens relatively early during ontogeny. Sutural elements in general are broadly rounded except for the lateral lobe which is pointed and asymmetric. ==References== * Morphometric Analyses and Taxonomy of Oxyconic Goniatites (Paratornoceratinae n. subfam) from the Early Famennean Tafilalt of the (Anti-Atlas, Morocco) in Proceeding of the Geological Survey, 57, Vienna, 2002. * ''Acrimeroceras'' in (Goniat Taxonomy ) * (Acrimeroceras- Paleodb ) * Miller, Furnish, and Schindewolf. Paleozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L. R.C. Moore (Ed). Geological Society of America, 1957. 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「Acrimeroceras」の詳細全文を読む スポンサード リンク
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