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Holoplanktonic Mollusca collected from c. 60 localities in Cenozoic (Eocene-Ypresian to Miocene-Serravallian) rocks of the Aquitaine Basin (southwest France) are represented by 75 taxa: five supposed Heteropoda (Pterotracheoidea) and 70 Pteropoda (69 Thecosomata, one Gymnosomata). All Heteropoda and 19 species of the Pteropoda had to be included in open nomenclature or with a query. Twelve species of pteropods are described as new to science: Heliconoides daguini sp. nov., H. merlei sp. nov., H. pyrenaica sp. nov. and Limacina? vegrandis sp. nov. from the Ypresian; Creseis antoni sp. nov. and Vaginella gaasensis sp. nov. from the Rupelian; Clio lozoueti sp. nov. and Clio vasconiensis sp. nov. from the Chattian; Diacrolinia cluzaudi sp. nov., from the Aquitanian; Creseis roesti sp. nov. from the Aquitanian/Burdigalian; and Heliconoides mermuysi sp. nov. and Creseis tugurii sp. nov. from the Early Burdigalian. Neotypes are designated for Diacrolinia aquensis, D. orbignyi and Vaginella depressa. The Aquitaine Basin assemblages are correlated with the existing holoplanktonic mollusc zonation for the North Sea Basin. Zones 9 (Ypresian), 10 (Lutetian) and 11/12 (Priabonian) could be recognised in the Aquitaine Basin Eocene, zones 15a (Rupelian) and 16b (Chattian) in the Oligocene, and zones 17 (Aquitanian-Burdigalian), 18 (Late Burdigalian), 18a (Langhian) and 19 (Serravallian) in the Miocene. Zone 17 could be subdivided on the basis of occurrences observed in the Aquitaine Basin, into three subzones, 17a (Aquitanian), 17b (earliest Burdigalian) and 17c (middle Burdigalian). [ABSTRACT FROM AUTHOR]