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

Syringonautilidae is a family of Nautiloidea from the middle to late Triassic. Syringonautilidae comprise the last of the Trigonocerataceae and are the source for the Nautilaceae which continued the Nautiloidea through the Mesozoic and into the Cenozoic right down to the recent. Syringonautilidae is a strictly Triassic family, derived early in the Triassic from the Grypoceratidae. (Kummel 1964)
==Diagnosis==
The Syringonautilidae are characterized by generally envolute shells - early whorls are in view - with broadly to sharply rounded whorl sections and smooth surfaces, except for growth lines and fine wire-like lirae in some forms. The siphuncle is variable in position, the suture is variably sinuous. (Kummel 1964,K437)

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「Syringonautilidae」の詳細全文を読む



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