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"Platystrophia" (Orthida) and New Related Ordovician and Early Silurian Brachiopod Genera

並列摘要


More than 150 Ordovician and Early Silurian brachiopod species have been assigned to the genus "Platystrophia King", 1850 mainly on the basis of their "Spirifer"-like shell exteriors. King's concept of the genus was based on "Platystrophia biforata" King, which is not conspecific with "Terebratulites biforatus" Schlotheim, traditionally regarded as the type species of "Platystrophia". "Porambonites costatus" Pander, 1830 is formally proposed as the type species of the genus to replace "P. biforata"; the latter is considered to be a "nomen dubium". In our revised diagnosis, "Platystrophia" is restricted to a group of Arenig to upper Caradoc species from Baltica and Avalonia, whereas the Ashgill and lower Silurian taxa of these regions, hitherto assigned to "Platystrophia", are placed in the new genus "Neoplatystrophia". "Platystrophia ponderosa" Foerste, 1909 from the Upper Ordovician of North America is proposed as the type species of a new genus "Vinlandostrophia". Two new species, "Platystrophia baltica" and "Platystrophia pogrebovi" from the Llanvirn-Caradoc of the East Baltic are also described.

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