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Journal of Paleontology; September 2009; v. 83; no. 5; p. 750-766; DOI: 10.1666/09-004.1
© 2009 Paleontological Society
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ARTICLE

THE CRETACEOUS AND PALEOCENE PLEUROTOMARIID (GASTROPODA: VETIGASTROPODA) FAUNA OF SEYMOUR ISLAND, ANTARCTICA

M.G. HARASEWYCH1, ANTON OLEINIK2 and WILLIAM ZINSMEISTER3

1 Department of Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution, PO Box 37012, Washington, DC 20013-7012 <HARASEWYCH{at}si.edu>
2 Department of Geosciences, Florida Atlantic University, 777 Glades Road, Boca Raton, FL, 33431-0991 <aoleinik{at}fau.edu>
3 Department of Earth and Atmospheric Sciences, Purdue University, 1397 Civil Engineering Building, West Lafayette, IN 47907-1397 <wjzins{at}purdue.edu>

Leptomaria antipodensis and Leptomaria hickmanae are described from the Upper Cretaceous [Maastrichtian] Lopez de Bertodano Formation, Seymour Island, and represent the first Mesozoic records of the family Pleurotomariidae from Antarctica. Leptomaria stillwelli, L. seymourensis, Conotomaria sobralensis and C. bayeri, from the Paleocene [Danian], Sobral Formation, Seymour Island, are described as new. Leptomaria larseniana (Wilckens, 1911) new combination, also from the Sobral Formation, is redescribed based on better-preserved material. The limited diversity of the pleurotomariid fauna of Seymour Island is more similar to that of the Late Cretaceous faunas of Australia and New Zealand in terms of the number of genera and species, than to the older, more diverse faunas of South America, southern India, or northwestern Madagascar, supporting the status of the Weddelian Province as a distinct biogeographic unit. The increase in the species richness of this fauna during the Danian may be due to the final fragmentation of Gondwana during this period.

Key Words: Pleurotomariidae • Antarctica • Maastrichtian • Paleocene • Seymour Island






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