Trigonia



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.

Species
The following Trigonia species have been described:


 * 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
 * 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: Bolivia (Copacabana Formation)
 * Permian

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

Afghanistan, Argentina, Canada (Alberta, British Columbia, Yukon), Chile, Colombia (Valle Alto Formation, Caldas), 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.
 * Jurassic

Afghanistan, Algeria, Antarctica, Argentina, Armenia, Australia, Brazil, Bulgaria, Canada (British Columbia), Chile, Colombia (Yuruma Formation, La Guajira, Macanal Formation, Eastern Ranges), 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.
 * Cretaceous

Argentina (Cerro Dorotea Formation)
 * Paleocene