Nineteen new species of Desmopachria Babington, 1841 (Coleoptera, Adephaga, Dytiscidae, Hydroporinae, Hyphydrini) with notes on the taxonomy of the genus.

Abstract

Nineteen new species of Desmopachria Babington, 1841 are described from multiple species groups. Two new species groups are erected, the Desmopachriaapicodente species group and the Desmopachriabifurcita species group. Desmopachriadivergens sp. nov. (Venezuela), Desmopachrialineata sp. nov. (Venezuela), Desmopachriasurinamensis sp. nov. (Suriname), and Desmopachriatenua sp. nov. (Guyana) are described in Desmopachria but are not assigned to a species group. Desmopachriaapicodente sp. nov. (Guyana, Venezuela), Desmopachrialateralis sp. nov. (Venezuela), and Desmopachriatumida sp. nov. (Venezuela) are described in the new Desmopachriaapicodente species group and are the only members of the group. Desmopachriabifurcita sp. nov. (Peru), and Desmopachrialata sp. nov. (Brazil) are described in the new Desmopachriabifurcita group. Other members of the Desmopachriabifurcita group are Desmopachriabifasciata Zimmermann, Desmopachriabolivari Miller, Desmopachriaovalis Sharp, and Desmopachriavarians (each previously "ungrouped"). Desmopachriapseudocavia sp. nov. (Venezuela) is described in the Desmopachriaconvexa-signata species group. Desmopachriawolfei sp. nov. (Venezuela) is described in the Desmopachrianitida species group. Desmopachriaangulata sp. nov. (Guyana, Suriname), Desmopachriaemarginata sp. nov. (Guyana, Suriname, Venezuela), Desmopachriaimparis sp. nov. (Guyana), Desmopachriaimpunctata sp. nov. (Suriname, Venezuela), and Desmopachriatruncata sp. nov. (Guyana, Suriname) are described in the Desmopachriaportmanni-aldessa species group. Desmopachriabisulcata sp. nov. (Suriname), and Desmopachriairregulara sp. nov. (Venezuela) are described in the Desmopachriaportmanni-portmanni species group. Desmopachriarobusta sp. nov. (Venezuela) is described in the Desmopachriastriola species group. A key to the species groups is included. Male genitalia are figured for all new species and dorsal habitus images are provided for most new species.