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Tropaeum
''Tropaeum'' ("Trophy") is an extinct genus of ammonite cephalopod found throughout the oceans of the world during the Early Cretaceous. As with many other members of the family Ancyloceratidae, there was a trend among species within this genus to uncoil somewhat, in a very similar manner in the genus ''Lytoceras''. The largest species, ''T. imperator'' of Australia, had a shell a little over one meter in diameter. ==External links==
*photograph of the holotype of ''T. imperator'' ()
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「Tropaeum」の詳細全文を読む
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