Coilopoceratidae

Coilopoceratidae
Temporal range: Turonian–Coniacian
Herrickiceras costatus (Placenticeras costatum)
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Superfamily: Acanthoceratoidea
Family: Coilopoceratidae
Hyatt, 1903
Genera
  • See text
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Coilopoceratidae is a family of generally large, proper ammnites with strongly involute shells from the Upper Cretaceous, Turonian and Coniacian stages. Coilopoceratids have variably compressed shells with flattish to broadly rounded sides and narrowly rounded to sharp keel-like venters. Whorl sections are generally lanceolate. The suture is ammonitic with an overall clumpy appearance.

The Coilopoceratidae are derived from the Tissotiidae by a secondary re-development of an ammonitic suture and of more narrowly compressed shells.

Genera

References

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