Trigonia

{{Automatic taxobox

| fossil_range = Permian-Paleocene
~{{fossil range|298|56}}

| image = Trigoniidae - Trigonia interlaevigata.JPG

| image_caption = A fossil shell of T. interlaevigata from Germany, of Jurassic age

| taxon = Trigonia

| authority = Bruguière, 1789

| synonyms =

| subdivision_ranks = Species

| subdivision = See text

}}

File:Trigoniacostata.jpg, showing main morphological features of the shell exterior;
a) Anterior; p) Posterior; d) Dorsal; v) Ventral; F) Flank; A) Area; c) Costae; mc) Marginal Carina
Trigonia costata ranges from the Lower Jurassic (Toarcian) to Middle Jurassic (Callovian).]]

Trigonia is an extinct genus of saltwater clams, fossil marine bivalve mollusk in the family Trigoniidae. The fossil range of the genus spans the Paleozoic, Mesozoic and Paleocene of the Cenozoic, from 298 to 56 Ma.

Description

The genus Trigonia is the most readily identifiable member of the family Trigoniidae, having a series of strong ribs or costae along the anterior part of the shell exterior. They are the first representatives of the family to appear in the Middle Triassic (Anisian) of Chile and New Zealand. The first European examples (Trigonia costata Parkinson) appear in the Lower Jurassic (Toarcian) of Sherborne, Dorset and Gundershofen, Switzerland.{{cite book| last=Francis |first=A.O. |year=2000 |title=The Palaeobiology of the European Jurassic Trigoniidae. Ph.D. thesis |publisher=University of Birmingham |pages=1–323}}

Species

The following Trigonia species have been described:[https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=17287 Trigonia] at Fossilworks.org

T. analoga
T. antiqua
T. castani
T. castrovillensis
T. coqueiroensis
T. costata
T. cragini
T. depauperata
T. eufaulensis gabbi
T. eufaulensis moorei
T. guildi
T. hemisphaerica
T. imbricata
T. interlaevigata{{citation needed|date=April 2017}}
T. intersitans
T. kitchini
T. maastrichtiana
T. maloneana
T. marginata
T. mearnsi
T. montanaensis
T. orientalis
T. papuana
T. picteti
T. plana
T. pseudocaudata
T. pseudocrenulata
T. pullus
T. rebouli
T. reesidei
T. resoluta
T. reticulata
T. saavedra
T. semiculta
T. somaliensis
T. stantoni
T. stolleyi
T. suborbicularis
T. sulcata
T. taffi
T. thierachensis
T. undulatocostata
T. vyschetzkii
T. weaveri

Distribution

Fossils of Trigonia have been registered in:

;Permian

Bolivia (Copacabana Formation)

;Triassic

Austria, China, Italy, the Russian Federation, United States (Alaska, Idaho), and Vietnam.

;Jurassic

Afghanistan, Argentina, Canada (Alberta, British Columbia, Yukon), Chile, Colombia (Valle Alto Formation, Caldas),Mojica, 1984, p.132 Egypt, Ethiopia, France, Germany, Greenland, India, Iran, Japan, Kenya, Luxembourg, Madagascar, Morocco, New Zealand, Poland, Portugal, the Russian Federation, Saudi Arabia, Somalia, Spain, Tanzania, Thailand, Tunisia, the United Kingdom, United States (Alaska, California, Idaho, Montana, Nevada, Oregon, Texas, Utah, Wyoming), and Yemen.

;Cretaceous

Afghanistan, Algeria, Antarctica, Argentina, Armenia, Australia, Brazil, Bulgaria, Canada (British Columbia), Chile, Colombia (Yuruma Formation, La Guajira, Macanal Formation, Eastern Ranges),Piraquive et al., 2011, p.204 Egypt, France, Germany, Greenland, Hungary, Italy, Lebanon, Mexico, the Netherlands, New Zealand, Papua New Guinea, Peru, Portugal, Serbia and Montenegro, South Africa, Spain, Switzerland, Tanzania, Turkmenistan, Russian Federation, Ukraine, the United Kingdom, United States (Arizona, California, Delaware, Mississippi, New Jersey, North Carolina, Tennessee, Texas), Venezuela, and Yemen.

;Paleocene

Argentina (Cerro Dorotea Formation)

References

= Bibliography =

{{citation |last=Mojica |first=Jairo |year=1984 |title=An outline on the Jurassic in Colombia |url=http://www.bdigital.unal.edu.co/31339/1/30503-110423-1-PB.pdf |journal=Geología Colombiana |volume=13 |pages=129–136 |access-date=2017-03-31}}
{{citation |last=Piraquive |first=Alejandro |last2=Díaz |first2=Juan Sebastián |last3=Cuéllar |first3=Tomas |last4=Pardo |first4=Germán |last5=Kammer |first5=Andreas |year=2011 |title=Reactivación Neógena de estructuras de rift del Cretácico Temprano asociadas con la Falla de Chámeza, Pajarito, Boyacá (Colombia): evidencias tectónicas y bioestratigráficas |url=http://www.bdigital.unal.edu.co/24942/1/22167-87412-2-PB.pdf |journal=Geología Colombiana |volume=36 |pages=197–216 |access-date=2017-08-04 }} {{Webarchive|url=https://web.archive.org/web/20170330091900/http://www.bdigital.unal.edu.co/24942/1/22167-87412-2-PB.pdf |date=2017-03-30 }}