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Background   Anosteira pulchra  is one of two species of the obligately-aquatic freshwater clade Carettochelyidae (pig-nosed turtles) from the Eocene of North America.  Anosteira pulchra  is typically rare in collections, and their distribution is poorly documented. The Uinta Formation [Fm.] contains a diverse assemblage of turtles from the Uintan North American Land Mammal Age. Whereas turtles are abundantly preserved in the Uinta Fm.,  A. pulchra  has been reported only from a few specimens in the Uinta C Member.    Methods  We describe new records of  Anosteira pulchra  from the Uinta Basin and analyze the distribution of 95 specimens from multiple repositories in the previously published stratigraphic framework of the middle and upper Uinta Fm.    Results  Here we report the first records of the species from the Uinta B interval, document it from multiple levels within the stratigraphic section and examine its uncommon appearance in only approximately 5% of localities where turtles have been systematically collected. This study details and extends the range of  A. pulchra  in the Uinta Fm. and demonstrates the presence of the taxon in significantly lower stratigraphic layers. These newly described fossils include previously unknown elements and associated trace fossils, with new anatomical information presented. This study provides insight into the taxonomy of  Anosteira  spp. in the middle Eocene, and suggests the presence of a single species, though no synonymy is defined here due to limits in Bridger material.

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Additional records and stratigraphic distribution of the middle Eocene carettochelyid turtle<i>Anosteira pulchra</i>from the Uinta Formation of Utah, North America

Additional records and stratigraphic distribution of the middle Eocene carettochelyid turtleAnosteira pulchrafrom the Uinta Formation of Utah, North America