Allocrioceras
Allocrioceras | |
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Fossil A. pariense from Utah | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Cephalopoda |
Subclass: | †Ammonoidea |
Order: | †Ammonitida |
Suborder: | †Ancyloceratina |
Family: | †Anisoceratidae |
Genus: | †Allocrioceras Spath, 1926 |
Species[1] | |
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Allocrioceras is an ammonoid cephalopod from the Turonian to Santonian stages of the Late Cretaceous,[1] included in the turrilitoid family Anisoceratidae. Its shell is strongly ribbed and is in the form of a widely open spiral.
Classification
After its 1907 discovery, the species A. hazzardi was erroneously classified as Crioceras latus by Udden. A later 1928 revision by Adkins removed it from the species C. latus while keeping it as a member of the genus Crioceras. In 1963, Young gave the species its final classification in a new genus, Allocrioceras, originally defined by Spath in 1926.[1]
Biology
Allocrioceras was small compared to some Ammonites. Its shell diameter was only a bit larger than an
Its stomach contents and some soft parts have been preserved in a fossil specimen of the species A. cf. annulatum found in the Sannine Formation of Lebanon, which show it preyed on comatulid crinoids and was a pelagic, aperture-upwards drifter.[2]
Distribution
Fossils of Allocrioceras have been found in Colombia (Loma Gorda Formation, Aipe, Huila),[3] France, Germany, Lebanon,[2] South Africa, Ukraine, the United Kingdom, and the United States (Arizona, Montana, New Mexico, Texas, Utah).[1]
References
- ^ a b c d Allocrioceras at Fossilworks.org
- ^ .
- ^ Patarroyo, 2011
Bibliography
- Patarroyo, Pedro. 2011. Sucesión de Amonitas del Cretácico Superior (Cenomaniano-Coniaciano) de la parte más alta de la Formación Hondita y de la Formación Loma Gorda en la Quebrada Bambucá, Aipe - Huila (Colombia). Boletín de Geología, Universidad Nacional de Colombia 33. 69-92. Accessed 2017-03-31.