Brachiopoda from the La Meseta Formation (Eocene), Seymour Island, Antarctica

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Abstract
Twelve species of brachiopods have been collected from the La Meseta Formation (Eocene) of Seymour Island, Antarctica, arrayed in one inarticulate and nine articulate genera. None of these brachiopods is known to reside currently in the region near Seymour Island. Modern congeneric descendants of some of these taxa are found in both shallow- and deep-water habitats in a wide variety of Southern Hemisphere localities. These adaptations to a broad spectrum of habitats and the restriction to lower latitudes may have been triggered by changing conditions in the region subsequent to the development of the circum-Antarctic current following deposition of the La Meseta Formation. The articulate brachiopod genera ?Probolarina, Tegulorhynchia, ?Plicirhynchia, and Terebratulina are noted from the La Meseta Formation for the first time, although the latter three genera have been identified previously from the Tertiary beds of nearby Cockburn Island, Antarctica.

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