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Guhsania
''Guhsania'' is an extinct ammonoid cephalopod genus that lived during the early Middle Jurassic, (early Bajocian),〔 from about 171.5 to 173.5 Ma. ''Guhsania'' belongs to the Sonniniidae, a member of the hildoceratacean superfamily. The shell (conch): essentially involute and ribbed throughout, umbilical edge sharp, outer whorl oxyconic.〔Treatise on Invertebrate Paleontology, Part L, 1957. p.L270〕 ==References==
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「Guhsania」の詳細全文を読む
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