Neoptychites

Neoptychites Temporal range: Turonian ~
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Ammonoidea
Order:	Ammonitida
Family:	Vascoceratidae
Genus:	Neoptychites Kossmat, 1895
Species
N. (Neoptychites) N. cephalotus N. crassus N. telinga N. transitorius N. xetriformis

Neoptychites is an extinct ammonoid cephalopod genus from the Turonian stage of the Upper Cretaceous (around 94 to 89 Ma), with a worldwide distribution.

Description

Neoptychites includes extremely involute Ammonitida whose outer whorls have a high triangular section with a moderately rounded venter (the outer rim). Tho body chamber in adults is generally smooth, with a constricted aperture. The earliest whorls are smooth except for periodic constrictions; later juvenile whorls have numerous low ribs without tubercles.

Taxonomy

Neoptychites belongs to the ammonite family Vascoceratidae and is included in the subfamily Vasoceratinae. The genus was named by Kossmat in 1895. Its type species is Ammonites telinga Stoliczka, 1865 (= Ammonites cephalotus Courtiller, 1860). It is probably derived from Paravascoceras.

Distribution

Fossils of Neoptychites have been found in Austria, Brazil, Cameroon, Colombia (La Frontera (Huila, Cundinamarca, Boyacá) and Loma Gorda Formations, Aipe, Huila), Egypt, France, India, Jordan, Mexico, Morocco, Niger, Nigeria, Romania, Tunisia, United States (Arizona, Colorado, New Mexico, Texas), and Venezuela.

References

Bibliography

• Patarroyo, Pedro. 2016. Amonoideos y otros macrofósiles del lectoestratotipo de la Formación la Frontera, Turoniano inferior - medio (Cretácico Superior) en San Francisco, Cundinamarca (Colombia). Boletín de Geología, Universidad Industrial de Santander 38. 41-54. Accessed 2017-04-04.
• 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 2017-03-30.

Further reading

• Arkell; et al. (1957). R.C. Moore (ed.). Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L. Geological Society of America, University of Kansas Press.
• W.A. Cobban; Hook, S.C. (1983). "Mid-Cretaceous (Turonian) ammonite fauna from Fence Lake area of west-central New Mexico". Memoir. 41. New Mexico Bureau of Mines & Mineral Resources, Socorro NM.
• W.A. Cobban; Hook, S.C. (1979). "Collignoniceras woollgari woollgari (Mantell) ammonite fauna from Upper Cretaceous of Western Interior, United States". Memoir. 38. New Mexico Bureau of Mines & Mineral Resources, Socorro NM.