Taxonomic revision and phylogeny of the genus Cetiocyon and its discovery in the Neotropical region (Insecta: Coleoptera: Hydrophilidae)
Abstract
The hydrophilid genus Cetiocyon Hansen is diagnosed and revised, resulting in the first record of the genus in the Neotropical Region and recognition of seven species in New Guinea. One new species, Cetiocyon incantatus new species, is described from Suriname, and three new species are described from the mountain range of New Guinea: Cetiocyon cribripunctatus new species, Cetiocyon hebaueri new species, and Cetiocyon riedeli new species.
An identification key is included for all recognized species, along with the photographs and illustrations of relevant morphological characters. A phylogenetic analysis based on 33 morphological characters supported the monophyly of the genus, its Australian-New Guinean origin, and suggested its close relationships to New Guinean genus Platycyon Hansen and New Guinean species of Pelosoma.
Three distinctive lineages have been recognized within Cetiocyon, two represented by New Guinean species, the other by the Neotropical one.