''Rhaetina'' is an extinct genus of
brachiopod
Brachiopods (), phylum (biology), phylum Brachiopoda, are a phylum of animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear e ...
s belonging to the family
Angustothyrididae.
[Paleobiology Database]
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Species
Species within this genus include:[
* †''Rhaetina beskessensis'' Dagys 1963
* †''Rhaetina caucasica'' Dagys 1963
* †''Rhaetina columnaris'' Jin et al. 1979
* †''Rhaetina elliptica'' Dagys 1963
* †''Rhaetina gregaria'' Suess 1854
* †''Rhaetina incurvirostra'' Hoover 1979
* †''Rhaetina jomdaensis'' Sun 1981
* †''Rhaetina ovalis'' Pearson 1977
* †''Rhaetina parva'' Jin et al. 1979
* †''Rhaetina pyriformis'' Suess 1854
* †''Rhaetina subcircularis'' Yang and Xu 1966
* †''Rhaetina taurica'' Moisseiev 1932
* †''Rhaetina tirolensis'' Siblik 1999
* †''Rhaetina triangularis'' Detre 1970
* †''Rhaetina zigasiensis'' Xu 1978
]
Fossil records
This genus is known in the fossil record from the Triassic
The Triassic ( ; sometimes symbolized 🝈) is a geologic period and system which spans 50.5 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.4 Mya. The Triassic is t ...
period (from about 251.3 to 201.6 million years ago). Fossils of species within this genus have been found in Europe, Canada, United States, China, Iran, Russia, Ukraine and Vietnam.[
*''Rhaetina gregaria''
It is one of the most common Late Triassic brachiopod species, that has been regarded as a survivor that ranges across the Triassic-Jurassic boundary into the Early Jurassic. The external morphology of specimens from before and after the Triassic–Jurassic extinction event were initially regarded identical. Study of the internal features showed they were actually distinct species to be assigned to different genera (See ]Elvis taxon
In paleontology, an Elvis taxon (plural ''Elvis taxa'') is a taxon that has been misidentified as having re-emerged in the fossil record after a period of presumed extinction, but is not actually a descendant of the original taxon, instead having d ...
).
See also
* List of brachiopod genera
This is a list of brachiopod genera which includes both Extinction, extinct (fossil) forms and Extant taxon, extant (living) genera (bolded). Names are according to the conventions of the International Code of Zoological Nomenclature.
A
*''Aal ...
References
{{Taxonbar, from=Q22285396
Prehistoric brachiopods of North America
Prehistoric brachiopod genera
Terebratulida
Jurassic brachiopods