Glochiceras

Glochiceras
Temporal range: Oxfordian–Kimmeridgian
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Family: Haploceratidae
Genus: Glochiceras
Hyatt, 1900

Glochiceras is a haploceratid ammonite characterized by a small, smooth, compressed, evolute shells with large lappets and a median lateral groove. Its geographic distribution is fairly cosmopolitan, but it is limited stratigraphically to the Oxfordian and Kimmeridgian stages in the Upper Jurassic.

The earlier, Bajocian, Cadomoceras is similar overall, except for having a large ventral rostrum and spatulate lappets at the aperture, and coarse ventral plications.

References

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