Grammoceras

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Grammoceras
Temporal range: Toarcian [1]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Family: Hildoceratidae
Subfamily: Grammoceratinae
Genus: Grammoceras
Hyatt, 1867
Species
  • Grammoceras striatulum(Sowerby, 1825)
  • Grammoceras chateleti(De Brun, 1929)
  • Grammoceras thouarsense(D'Orbigny, 1843)
  • Grammoceras penestriatulum(Buckman, 1902)
  • Grammoceras arenaceum (m) (Buckman, 1904)
  • Grammoceras glabrum (m) (Monestier, 1921)

Grammoceras is an extinct genus of ammonite found in Yorks Ravenscar, England, from Jurassic period sediments. Its overall distribution is fairly worldwide.

Grammoceras has a thin, discoidally evolute shell with simple, gently sigmoid ribbing and a low ventral keel. Dumortiera and Catulloceras from the same age are similar except that Dumortiera has a more rounded venter and Catulloceras has a subquadrate whorl section. Asthenoceras from the slightly younger lower Bajocian may be a subgenus.

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References

  1. Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology. 363: 1–560. Archived from the original on 2008-05-07. Retrieved 2017-10-18.