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Alocolytoceratinae is a subfamily of lytoceratids that comprises genera characterized by many deep constrictions in the shell resulting in capricorn-like (goat's horm) ornamention, especially in the middle whorls, but becoming smooth and more involute in the outer whorls. Saddle endings in the suture tend to be phylloid, (leaf-like). Alcolytocerainae includes ''Alocolytoceras'', ''Lobolytoceras'', ''Pachylytocras'', and ''Pleurolytoceras'', which are mostly from the Toarcian. One genus, ''Pachylotoceras'', extends into the lower Bajocian. ==References== ;Notes ;Bibliography *W.J.Arkell, B.Kummel,& C.W.Wright 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L Ammonoidea. 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「Alocolytoceratinae」の詳細全文を読む スポンサード リンク
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