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Dimeroceratidae is one of three families in the Dimeroceratoidea, a goniatid superfamily included in the Ammonoidea; extinct shelled cephalopods with adorally convex septa and usually narrow ventro-marginal siphuncles. The family Dimeroceratidae was established for the genus ''Dimeroceras'' which was previously included in the Cheiloceratidae in the Treatise on Invertebrate Paleontology Part L, but differing from the similar subglublar to thickly lentiuclar ''Cheiloceras'' in having a large lateral lobe and the umbilical lobe outside the umbilucus. The Dimeroceratidae are derived from the Cheiloceratid genus ''Torleyoceras'' through the ancestral ''Paradimeroceras'' which gave rise to ''Dimeroceras'', (Saunders et al. 1999). Other genera included are ''Paratornoceras'' and ''Acrimeroceras''. Dimeroceratids have been found in the Devonian of China and Australia. ==References== * Miller, Furnish, & Schindewolf, 1957. Paleozoic Ammonoidea. Treatise on Invertebrate Paleontology Part L. R.C. Moore (Ed) Geological Society of America. * Saunders, Work, & Nikoleava, 1999. Evolution of Complexity in Paleozoic Ammonoid Sutures, Supplementary Material () *(Dimeroceratidae-Paleodb ) 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「Dimeroceratidae」の詳細全文を読む スポンサード リンク
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