Out of the Palaearctic: the Helophorus water beetles of the Afrotropical Region (Coleoptera: Helophoridae)
David T. Bilton
Helophorus Fabricius, 1775 (Coleoptera: Hydrophiloidea: Helophoridae) is an old and largely Holarctic genus of beetles, with most extant diversity concentrated in the Palaearctic. As with a number of primarily northern temperate lineages, the genus has colonised the Afrotropical Region, with species…