http://worldcat.org/entity/work/id/499439667

Eocene Euthecosomatous Pteropoda (Gastropoda) of the Gulf and Eastern Coasts of North America

Euthecosomatous pteropods of Early Tertiary seas were equally or more diverse than they are in present-day oceans, and probably as abundant. Twenty-eight new species (Altaspiratella grailens, Limacina adornata, Limacina aegis, Limacina canadaenis, Limacina concolutus, Limacina davidi, Limacina heatherae, Limacina helikos, Limacina labiata, Limacina plandioralis, Limacina smithvillensis, Limacina stenzeli, Limacina texana, Limacina coluta, Limacina wechesensis, Skaptotion? reklawensis, Skaptotion spirale, Camptoceratops americanus, Cheilospicata repanda, Creseis cylindrica, Bucanoides basiannulata, Bucanoides divaricata, Bucanoides tenus, Cuvierina gutta, Cuvierina lura, Loxobidens aduncus, Tibiella annulata, and Tibiella reflexa) and three new genera (Bucanoides, Cheilospicata, and Loxobidens) are described from the Eocene of Texas, Louisiana, Alabama, Mississippi, and the Nova Scotian shelf. In addition, seven species that previously were not reported form North America were found in the these localities. These 35 species plus 13 previously described North American Eocene pteropod species constitute a total of 48 species now known to occur in North America. All of these species are formally described here except for single specimens of Hyalocylis sp. A, Creseis sp. A, and Praehyalocylis cretacea (Blanckenhorn, 1889). The latter species has been described from the late Eocene of Oregon and Washington (Squires, 1989). It is basically a worldwide species with additional reported occurrences in Russia, Turkey, and Australia. The genera Camptoceratops and Euchilotheca are reported from North America for the first time.

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