Exogyra
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Exogyra is an extinct genus of marine oysters that belongs to the family Gryphaeidae (honeycomb oysters).[1] These bivalves were cemented by the more cupped left valve. The right valve is flatter, and the beak is curved to one side. Exogyra lived on solid substrates in warm seas[citation needed] during the Jurassic and Cretaceous periods.[2]
Taxonomy
The former subgenus Exogyra (Aetostreon) Bayle, 1878,[3] is sometimes considered a separate genus due to a lack of the fine set of parallel ribs (chomata) separated by pits on the inner surface of the valves (which is present in the nominate subgenus).[4]
Species
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Distribution
Fossils of Exogyra have been found in:[2]
- Jurassic
Afghanistan, Chile, China, Eritrea, Ethiopia, France, Germany, India, Kenya, Poland, Portugal, Somalia, Spain, Tanzania, the United Kingdom, and Yemen.
- Cretaceous
Afghanistan, Algeria, Argentina, Brazil, Bolivia, Canada (British Columbia), Bulgaria, Chile, Colombia (Hiló Formation, Tolima, Macanal and Chipaque Formations, Eastern Ranges),[13][14] Cuba, the Czech Republic, Egypt, Ethiopia, France, Germany, Greenland, Hungary, India, Iran, Israel, Italy, Jordan, Lebanon, Libya, Madagascar, Mexico, Morocco, Mozambique, New Zealand, Nigeria, Oman, Pakistan, Peru, Poland, Portugal, Serbia and Montenegro, Slovakia, South Africa, Spain, Sweden, Switzerland, Tanzania, Trinidad and Tobago, Tunisia, Turkey, USSR, Ukraine, the United Kingdom, United States (Alabama, Arizona, Arkansas, California, Colorado, Delaware, Georgia, Maryland, Minnesota, Mississippi, Missouri, Montana, New Jersey, New Mexico, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Utah, Wyoming), Venezuela, and Yemen.
References
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- ^ Page Module:Citation/CS1/styles.css has no content."Evolution of Exogyra plexa". Archived from the original on 26 March 2008. Retrieved 25 March 2008.
- ^ a b Exogyra at Fossilworks.org
- ^ Page Module:Citation/CS1/styles.css has no content."†Exogyra (Aetostreon) Bayle 1878". Paleobiology Database. Fossilworks. Archived from the original on 13 December 2021. Retrieved 17 December 2021.
- ^ Page Module:Citation/CS1/styles.css has no content.Pugaczewska, Halina (1975). "Neocomian oysters from Central Poland" (PDF). Acta Palaeontologica Polonica. 20 (1): 47–72.
- ^ Exogyra africana
- ^ Roemer, F. (1849). Texas mit besonderer Rücksicht auf deutsche Auswanderung und die physischen Verhältnisse des Landes nach eigener Beobachtung. A. Marcus.
- ^ Exogyra davidsoni at Fossilworks.org
- ^ Exogyra
- ^ Lake.P., and Rastall.R.H., (1913), A Text Book of Geology, 2nd edition, London: Edward Arnold's Geological series Page 426 and 436
- ^ Exogyra praevirgula
- ^ Page Module:Citation/CS1/styles.css has no content."Global Names Index". Archived from the original on 6 November 2014. Retrieved 5 November 2014.
- ^ Ivanov. M., Hrdlickova. S., and Gregorova. R., (2005), The Complete Encyclopedia of Fossils, 3rd. ed., Lisse: Rebo International, page 133
- ^ Piraquive et al., 2011, p. 204
- ^ Acosta & Ulloa, 2002, p. 54
Bibliography
- Page Module:Citation/CS1/styles.css has no content.Acosta, Jorge E.; Ulloa, Carlos E. (2002), Mapa geológico del Departamento de Cundinamarca 1:250,000 - Memoria Explicativa, Colombian Geological Survey, pp. 1–108
- Page Module:Citation/CS1/styles.css has no content.Piraquive, Alejandro; Díaz, Juan Sebastián; Cuéllar, Tomas; Pardo, Germán; Kammer, Andreas (2011), "Reactivación Neógena de estructuras de rift del Cretácico Temprano asociadas con la Falla de Chámeza, Pajarito, Boyacá (Colombia): evidencias tectónicas y bioestratigráficas" (PDF), Geología Colombiana, 36: 197–216, archived from the original (PDF) on 30 March 2017, retrieved 4 August 2017
Further reading
- National Audubon Society Field Guide to North American Fossils
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