Neoptychites is an extinct ammonoid cephalopod genus from the Turonian stage of the Upper Cretaceous (around 94 to 89 Ma),[1] with a worldwide distribution.[2]

Neoptychites
Temporal range: Turonian
~94.3–89.3 Ma
Scientific classification
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Genus:
Neoptychites

Kossmat, 1895
Species[1]
  • N. (Neoptychites)
  • N. cephalotus
  • N. crassus
  • N. telinga
  • N. transitorius
  • N. xetriformis

Description

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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

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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

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Fossils of Neoptychites have been found in Austria, Brazil, Cameroon, Colombia (La Frontera (Huila, Cundinamarca, Boyacá) and Loma Gorda Formations, Aipe, Huila),[3][4] Egypt, France, India, Jordan, Mexico, Morocco, Niger, Nigeria, Romania, Tunisia, United States (Arizona, Colorado, New Mexico, Texas), and Venezuela.[1]

References

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  1. ^ a b c Neoptychites at Fossilworks.org
  2. ^ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
  3. ^ Patarroyo, 2016, p.41
  4. ^ Patarroyo, 2011, p.69

Bibliography

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Further reading

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  • 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.