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''Lissoceras'' is an involute, smooth or finely vetrolaterally ribbed, ammonite with a blunt, un-keeled venter, included in the Haploceratidae, that lived from the Lower Bajocian - Middle Oxfordian (Middle to Upper Jurassic) in what is now Europe, south Asia, and southern Alaska. ''Lissoceratoides'', once considered to be a subgenus of ''Lissoceras'', is indistinguishable morphologically from it. ==References== Arkell et al., 1957 Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L. Geol Society of America and Univ Kansas Press R.C Moore (ed) 1957 D.T Donavan, J.H. Callomon, and M.K Howarth. 1981. Classification of the Jurassic Ammonitina. In ''The Ammonoidea''. M.R. House and J.R. Senior, eds. Systematics Assoc. Pub Academic Press. (''Lissoceras'' ) 4/27/11 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「Lissoceras」の詳細全文を読む スポンサード リンク
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