<i>Copelatus</i> diving beetles (Coleoptera, Dytiscidae) from early Miocene Mexican amber, with description of a new species displaying distinct sexual dimorphism

Abstract Two diving beetle species (Coleoptera, Dytiscidae) from the extant genus Copelatus Erichson are documented from early Miocene Mexican amber. Copelatus chiapas new species is described based on a series of specimens of both sexes. Copelatus chiapas n. sp. is the third species of the subfamily Copelatinae described from amber and the first fossil diving beetle for which distinct sexual dimorphism is documented. The other species remains identified to genus level only, due to poor structural visibility. Key morphological characters of the species are illustrated. UUID: http://zoobank.org/0127be7a-bcb5-41da-9363-283d5cd49738