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The Upper Cretaceous-lowermost Tertiary López de Bertodano and Sobral Formations Seymour Island, Antarctic Peninsula, contain one of the most important marine faunas known for this interval of the Earth’s history. Faunal data from this sequence are providing important new understanding of the origin and biogeographic history of the marine biota of the Southern Hemisphere and insight into the faunal transition at the end of Cretaceous time.

The bivalves described herein where collected during four expeditions (1975, 1982, 1983–1984–1985) to Seymour Island. In addition, the collections made by the Swedish South Polar Expedition, 1901–1903, housed in the Naturhistoriska Riksmuseet, Stockholm, were also examined during the course of this study. This chapter describes 13 new species and 2 genera of bivalves: Nucula (Leionucula) hunickeni n. sp., Australoneilo casei n. sp., Austrocucullaea n. gen. oliveroi n. sp., Cucullaea ellioti n. sp., Pinna freneixae n. sp., Phelopteria feldmanni n. sp., Entolium seymourensis n. sp., E. sadleri n. sp., Acesta shackletoni n. sp., A. webbi n. sp., Seymourtula n. gen. antarctica (Wilckens), Lahillia huberi n. sp., Marwickia woodburnei n. sp., Cyclorisma chaneyi n. sp., Surobula n. gen. nucleus (Wilckens), Thracia askinae n. sp. Twenty-one previously described species are redescribed and figured, and their taxonomy revised.

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