2026/06/01 by Mario Cupello, Cibele S. Ribeiro-Costa, Cibele Stramare Ribeiro-Costa +3
Agricultural and Biological Sciences · Earth and Planetary Sciences · Environmental Science · #Coleoptera Taxonomy and Distribution #Ecology and Vegetation Dynamics Studies #Scarabaeidae Beetle Taxonomy and Biogeography
paper · pdf · doi:10.11606/1807-0205/2026.66.special-issue-1.012
crossref issued 2026/06/01 · crossref published 2026/06/01 · crossref published-online 2026/06/01 · openalex publication_date 2026/06/01 · crossref created 2026/06/11 · crossref deposited 2026/06/11 · openalex created_date 2026/06/12 · openalex updated_date 2026/06/13 · crossref indexed 2026/07/30
The study of the original description and the holotype – and only known specimen – in the Natural History Museum, London, allows us to transfer the Brazilian Amazon species Choeridium tridenticeps Arrow, 1913, currently treated in Ateuchus Weber, 1801 (= Choeridium Le Peletier de Saint-Fargeau & Audinet-Serville, 1828), to the genus Canthidium Erichson, 1847. Features such as a trituberculate head, protibiae serrated along the outer edge, and a row of deep punctures covering the posterior edge of the pronotum are alien to Ateuchus, but commonly found in Canthidium. At the same time, the specimen matches all known diagnostic features of Canthidium, with the posterior pronotal punctation placing it in the subgenus Neocanthidium Martínez et al., 1964. The new combination Canthidium (Neocanthidium) tridenticeps (Arrow, 1913) is thus established. Canthidium now includes 176 species. The C. tridenticeps holotype was collected during the Amazon leg of the 1911 Stanford Expedition to Brazil, along the Madeira-Mamoré Railroad, then under construction. We provide coordinates for each of the construction camps visited by the collectors W.M. Mann and F. Baker, including Camp 28 (09°38′57″S, 64°58′05″W), in modern Mutum-Paraná (Porto Velho, Rondônia), the type locality of C. tridenticeps. This is a preliminary contribution from our ongoing Ateuchus and Canthidium revisionary projects.