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|regnum = Animalia |phylum = Mollusca |classis = Cephalopoda |subclassis = Ammonoidea |superfamilia = Perisphinctaceae |familia = Aspidoceratidae |genus = ''Benacoceras'' |genus_authority = Spath, 1925 |subdivision_ranks = Species |subdivision = None Cataloged }} ''Benacoceras'' is a strongly ribbed, evolute ammonite from the Late Jurassic, coiled so that all whorls are exposed. Ribbing is biplicate, with very short secondaries. The venter, the outer rim, is smooth, at least on the outer whorl. ==References== ;Notes ;Bibliography *Treatise on Invertebrate Paleontology, Part L; Ch. Mesozoic Ammonoidea. Geological Soc of America and U Kansas Press, R.C Moore (ed) 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「Benacoceras」の詳細全文を読む スポンサード リンク
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