Canthyporus aenigmaticus Biström & Nilsson

Bilton, David T., 2015, A review of the Canthyporus exilis group, with the description of two new species (Coleoptera: Dytiscidae), Zootaxa 3957 (4), pp. 441-454 : 451

Canthyporus aenigmaticus Biström & Nilsson

Described on the basis of a single male, collected in the Cederberg by Sebastian Endrödy-Younga ( Biström & Nilsson 2006). My collections of this species include the first known females. These differ from males in the slightly more strongly impressed microreticulation, particularly on the elytra, the narrower pro- and mesotarsi and the shorter apical segment of the mesotarsi. The spermatheca is relatively small, short and stout, with a relatively narrow fertilization duct ( Fig. 3 A). The spermathecal duct (not shown due to damage during extraction) is coiled, and closely resembles that of other species of the group. I can add the following records, extending the species’ distribution north to the Gifberg-Matsikamaberg massif, which represent the northernmost extension of the Cape Fold Mountains, and the adjacent Bokkeveld Escarpment: 27 /ix/ 2010 Northern Cape, temporary pond beside R 27 ca. 1 km E of Vanrhyns Pass (1 ♀, teneral); 20 /ix/ 2014 Western Cape, Gifberg, stream over sandstone rock in Gifberg pass (1 ♂, 1 ♀); 21 /ix/ 2014 Western Cape, Matsikammaberg, temporary rockpools on NE edge of summit plateau ( Fig. 4 A) (2 ♂, 4 ♀, some teneral).