Allocrioceras
| Allocrioceras Temporal range: Turonian-Santonian
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| Fossil A. pariense from Utah | |
Scientific classification 
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| 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 U.S. quarter. Unlike most Ammonites its shell was partially uncoiled. Ammonites like this, with shell configurations differing from the typical tightly coiled spiral, are called heteromorphs. It lived approximately 88 million years before present during the Turonian stage Cretaceous Period in what is now Texas. Its fossils can be found in the limestones of Brewster and Terrel counties.
Its stomach contents and some soft parts have been found.[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
- ^ a b Wippich, M. G. E.; Lehmann, J. (2004). "Allocrioceras from the Cenomanian (mid-Cretaceous) of the Lebanon and its bearing on the palaeobiological interpretation of heteromorphic ammonites". Palaeontology. 47 (5): 1093–1107. doi:10.1111/j.0031-0239.2004.00408.x.
- ^ Patarroyo, 2011
Bibliography[]
- . 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.
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- Ammonitida genera
- Heteromorphic ammonites
- Turonian genus first appearances
- Santonian genus extinctions
- Ammonites of Africa
- Cretaceous Africa
- Late Cretaceous ammonites of Europe
- Late Cretaceous ammonites of North America
- Cretaceous United States
- Ammonites of South America
- Cretaceous Colombia
- Fossil taxa described in 1926
- Turrilitoidea
- Ammonitida stubs