Fig. 36 in A monographic revision of the Neotropical dung beetle genus Sylvicanthon Halffter & Martínez, 1977 (Coleoptera: Scarabaeidae: Scarabaeinae: Deltochilini), including a reappraisal of the taxonomic history of 'Canthon sensu lato'

Fig. 36. Clinal morphological variation in S. bridarollii (Martínez, 1949). Note that, from south to north, the colouration of metafemora gradually fades from dark brown to reddish brown and orange with a light-brown base in populations of northern Peru, Ecuador, and Colombia, and that the internal margin of protibiae (indicated by the red arrows) becomes progressively much subtler. Other features varying along this north-south cline are the presence of coarse elongate punctures at the base of metafemora (present in southern populations and absent in the northern ones) and of a fine transverse line on the posterior edge of pronotum (absent in the southern populations). See the text for more details.