Cymatonautilus

Cymatonautilus
Temporal range: M-U Jurassic
Scientific classification
Class: Cephalopoda
Order: Nautilida
Superfamily: Nautilaceae
Family: Cymatoceratidae
Genus: Cymatonautilus
Spath, 1927

Cymatonautilus is a cymatoceratid from the middle and upper Jurassic of Europe, the Middle East and Asia characterized by a robust shell with a wide umbilicus and subquadrate whorl section, slightly wider than high. The flanks and venter are flattened. The flanks have a wide lateral groove; the venter a more narrow median groove. The suture has a shallow ventral lobe and broad concave lateral lobes, crossed obliquely by sinuous ribs that produce a deep ventral sinus. The siphuncle is subcentral.

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