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Cylindrostethus gaudanti sp. nov., first fossil representative of the gerrid Cylindrostethinae, is described from the Paleocene of Menat (Centre of France). It is very modern in appearance, and its characters are sufficiently preserved to permit specific identification into the genus Cylindrostethus. Its presence in the European Paleogene suggests that this subfamily is very ancient, in accordance with its present disjunct tropicopolitan distribution. The modern Cylindrostethinae are restricted to the tropical rainforests, in accordance with the similar palaeoenvironment of the Menat ancient lake. Possible sexual dimorphic trait in the length of the fore femora is described for the new species. Viktor Hartung. Staatliches Museum für Naturkunde Karslruhe, Erbprinzenstrasse 13; D-76133 Karlsruhe, Germany. viktor.hartung@smnk.de Romain Garrouste. Institut de Systématique, Évolution, Biodiversité, ISYEB UMR 7205 – CNRS, MNHN, UPMC, EPHE, Muséum national d’Histoire naturelle, Sorbonne Universités, 57 rue Cuvier, CP 50, Entomologie, F-75005, Paris, France. e-mail: garroust@mnhn.fr Jean-Marc Pouillon. 179 rue des Plattieres, F-38300 Nivolas Vermelle, France. jmpdb@wanadoo.fr André Nel. Institut de Systématique, Évolution, Biodiversité, ISYEB UMR 7205 – CNRS, MNHN, UPMC, EPHE, Muséum national d’Histoire naturelle, Sorbonne Universités, 57 rue Cuvier, CP 50, Entomologie, F75005, Paris, France. anel@mnhn.fr Corresponding author

First fossil of Cylindrostethinae (Heteroptera: Gerromorpha: Gerridae) in the Paleocene of Menat, France