Morrowites

Morrowites
Temporal range: Turonian 94.3–89.3 Ma
↓
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Family: †Acanthoceratidae
Subfamily: †Mammitinae
Genus: †Morrowites
Cobban & Hook, 1983
Species
  • † M. depressus
  • † M. dixeyi
  • † M. subdepressus
  • † M. wingi

Morrowites, named by Cobban and Hook, 1983, is a moderate to large-sized ammonite with quadrangular to depressed whorls, broadly rounded to depressed venter, low ribs, umbilical and inner and outer ventrolateral tubercles and smooth early whorls except for occasional ribs along weak constrictions. The suture is moderately simple and has an unusually broad bifid first lateral lobe. It is so far restricted to the Lower Turonian stage, in the mid Cretaceous.

Morrowites closely resembles Mammites, however Morrowites has a broad first lateral lobe, Mammites has a narrow one. The very early whorls of Morrowites are smooth except for distantly placed ribs and constrictions, those of Mammites have normal ribs and tubercles.

Etymology

Morrowites is named in honor of A. L. Morrow who made a pioneering study of Cenomanian and Turonian ammonites of Kansas.

Distribution

Fossils of Morrowites have been found in Colombia (Loma Gorda Formation, Aipe, Huila),[1] France, Germany, Mexico, Nigeria, and the United States (Arizona, New Mexico).[2]

References

  1. ↑ Patarroyo, 2011, p.69
  2. ↑ Morrowites at Fossilworks.org

Bibliography

Further reading

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.