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・ Pachylarnax
・ Pachylarnax praecalva
・ Pachylebia
・ Pachylebiodes
・ Pachylemur
・ Pachylepyrium
・ Pachylia
・ Pachylia darceta
・ Pachylia ficus
・ Pachylia syces
・ Pachyligia
・ Pachylinae
・ Pachylioides
・ Pachylioides resumens
・ Pachylomera femoralis
Pachylyroceras
・ Pachymantis bicingulata
・ Pachymantis dohertii
・ Pachymasiphis
・ Pachymatisma
・ Pachymatisma johnstonia
・ Pachymelania
・ Pachymelania aurita
・ Pachymelania byronensis
・ Pachymelania fusca
・ Pachymenes
・ Pachymenia
・ Pachymerium
・ Pachymerium antipai
・ Pachymerium caucasicum


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Pachylyroceras : ウィキペディア英語版
Pachylyroceras

''Pachylyroceras'' is a large, generally subglobular, Upper Mississippian gonitite and included in the cephalopod subclass Ammonoidea.
==Recognition==
''Pachylyroceras'' produced a large shell that is moderately evolute to moderately involute and thickly discoidal to subglobular, with a rather wide umbilicus. Surface sculpture consists of coarse, widely spaced longitudinal lirae. Constrictions where present are wide and deep. Its suture has a narrow bifurcated ventral lobe with slightly divergent to subparallel sides and a median saddle less than half the height.

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「Pachylyroceras」の詳細全文を読む



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