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|regnum = Animalia |phylum = Mollusca |classis = Cephalopoda |subclassis = Ammonoidea |genus = ''Ammonoceratites'' |genus_authority = Bowditch 1822 |subdivision_ranks = Species 〔(Paleobiology Database - Ammonoceratites ). 2014-05-29.〕 |subdivision = * ''A. crenocostatus'' * ''A. lamarcki'' * ''Lytoceras (Ammonoceratites) betiokyense'' }} ''Ammonoceratites'' is an extinct genus of ammonoid cephalopod known from the Albian (upper Lower Cretaceous) of British Columbia, Madagascar, New Zealand, and Japan, included in the Lytoceratidae. The shell of ''Ammonoceratites'' is evolute, smooth, moderately expanded; the inner rim (dorsum) only slightly impressed; whorl section subcircular. It is similar to that of ''Lytoceras'' which has transverse ribbing and to that of ''Pictetia'' which is gyroconic (whorls not touching) and more strongly expanded. ==References== *Arkell ''et al'', 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L; Geological Society of America and University of Kansas press. *C. W. Wright, J. H. Calloman, and M. K. Howarth. 1996. Cretaceous Ammonoidea. Treatise on Invertebrate Paleontology ''revised'' L(4):1-362 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「Ammonoceratites」の詳細全文を読む スポンサード リンク
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