Abstract
The results of a taxonomic and morphological revision of Mionetta natator (Milne-Edwards, 1867) from the lower Miocene of Western and Central Europe are presented. It is shown that the collections of small ducks from Saint-Gérand-le-Puy localities (France) indeed contain a small species of the genus Mionetta, which is here described as Mionetta defossa sp. nov. At the same time, Mionetta natator represents a separate taxon and is here assigned to the genus Caerulonettion gen. nov., showing morphological similarities with modern Malacorhynchus and fossil Mioquerquedula spp. The first finds of small ducks from the lower Miocene of Kazakhstan are also described (Aral Svita, the Agyspe and Altynshokysu localities; Akzhar Svita, the Blue Sands locality), tentatively attributed to Mionetta defossa and Mionetta sp. The diversity and relationships of small ducks of the early–middle Miocene of Eurasia are discussed.
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