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PSEUDORTHOCERATIDAE [1 record]

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Record 1 1977-07-14

English

Subject field(s)
  • Paleontology
OBS

[Cephalopods of the family pseudorthoceratidae are] cyrtochoanitic orthocones and longiconic cyrtocones, in which endosiphuncular annuli develop into [a] continuous parietal endosiphuncular lining, each deposit extending forward or backward from its point of origin to join the next. "L. Sil.-Perm.

French

Domaine(s)
  • Paléontologie
OBS

[Les céphalopodes de la famille des pseudorthoceratidae sont] surtout orthocônes, [ils ont un] apex légèrement cyrtoconiques exogastriques; [ils sont] exceptionnellement cyrtôcones. [Ils ont un] siphon mince et orthochoané chez le jeune, puis plus large et cyrtochoané. [Ils ont des] cols septaux courts. [Les] anneaux d'obstruction [sont] développés en une doublure continue; chaque anneau, par sa croissance en direction adorale, rejoignant le suivant. [Ils sont] amincis dorsalement jusqu'à disparition totale (sinus dorsale) sur la ligne dorsale (...)

Spanish

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