Abstract

The fossils originally assigned to the family Hydrophilidae (Coleoptera, Polyphaga) from the late Miocene locality of Öhningen (southern Germany) are revised. Nine hydrophilid species are recognized, most of them representing the tribe Hydrophilini. Five species are reliably assigned to genera: Hydrochara noachica (Heer, 1847), n. comb. (=Hydrophilus rehmanniHeer, 1847, n. syn.), Hydrobiomorpha braunii (Heer, 1847), n. comb. (=Hydrous escheriHeer, 1862, n. syn.), Hydrobiomorpha heeri n. sp., Hydrophilus spectabilisHeer, 1847 (=Hydrophilus knorrii Heer, 1847, n. syn., =Hydrophilus giganteusHeer, 1862, n. syn.), and Hydrophilus vexatoriusHeer, 1847. Two taxa are treated as Hydrophilini incertae sedis: Hydrophilopsis elongataHeer, 1862, and Hydrous ovalisHeer, 1862. Two species represent Hydrophilidae incertae sedis: Escheria ovalisHeer, 1847 and E. bellaHeer, 1862. The fossil genus HydrophilopsisHeer, 1862 likely represents the modern genera SternolophusSolier, 1834 or HydrobiomorphaBlackburn, 1888, the fossil genus EscheriaHeer, 1847 likely represents some modern genus within the Hydrophilini or Hydrobiusini. Six taxa are excluded from the Hydrophiloidea: Helophorus magnusHeer, 1862, H. exilisHeer, 1862 (possibly belonging to Curculionidae), Hydrobius couloniHeer, 1862 and H. godetiHeer, 1862 (both possibly belonging to Curculionidae: Zygopinae), Hydrophilus braunii var. minorHeer, 1862, and Hydrophilus stenopterusHeer, 1862 (likely a leaf fossil). Our revision revealed a rather high amount of inaccurate family and genus assignments and a moderate amount of species-level synonymy in the original treatment of Öhnigen fauna by O. Heer. The diversity of the hydrophilid beetles in Öhningen is thus lower than previously reported, but still being slightly higher compared to other European Paleogene and Neogene localities.

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