Allocrioceras
{{Short description|Genus of molluscs (fossil)}}
{{Automatic taxobox
|fossil_range = Turonian-Santonian
~{{fossil range|94|85}}
|image = Allocrioceras pariense.jpg
|image_caption = Fossil A. pariense from Utah
|taxon = Allocrioceras
|authority = Spath, 1926
|subdivision_ranks = Species
|subdivision =
- A. angustum
- A. annulatum
- A. billinghursti
- A. burckhardti
- A. cuvieri
- A. dentonense
- A. hazzardi
- A. larvatum
- A. nodiger
- A. pariense
}}
Allocrioceras is an ammonoid cephalopod from the Turonian to Santonian stages of the Late Cretaceous, 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.
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 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.{{Cite journal| first1 = M. G. E.| first2 = J.| title = Allocrioceras from the Cenomanian (mid-Cretaceous) of the Lebanon and its bearing on the palaeobiological interpretation of heteromorphic ammonites| last1 = Wippich| journal = Palaeontology| volume = 47| issue = 5| pages = 1093–1107| year = 2004| doi = 10.1111/j.0031-0239.2004.00408.x| last2 = Lehmann| doi-access = | bibcode = 2004Palgy..47.1093W}}
Distribution
Fossils of Allocrioceras have been found in Colombia (Loma Gorda Formation, Aipe, Huila),Patarroyo, 2011 France, Germany, Lebanon, South Africa, Ukraine, the United Kingdom, and the United States (Arizona, Montana, New Mexico, Texas, Utah).[https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=14535 Allocrioceras] at Fossilworks.org
References
{{Reflist}}
= Bibliography =
- {{citation |last=Patarroyo |first=Pedro |year=2011 |title=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) |url=http://www.scielo.org.co/pdf/boge/v33n1/v33n1a06.pdf |journal=Boletín de Geología, Universidad Nacional de Colombia |volume=33 |pages=69–92 |accessdate=2017-03-31}}
{{Taxonbar|from=Q4733038}}
Category:Heteromorphic ammonites
Category:Turonian genus first appearances
Category:Santonian genus extinctions
Category:Late Cretaceous ammonites of Europe
Category:Late Cretaceous ammonites of North America
Category:Cretaceous United States
Category:Ammonites of South America
Category:Fossil taxa described in 1926
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