Dichotomius (Cephagonus) fissus (Harold)

Nunes, Rafael V. & Vaz-de-Mello, Fernando Z., 2019, Taxonomic revision of Dichotomius (Cephagonus) Luederwaldt 1929 and the taxonomic status of remaining Dichotomius Hope 1838 subgenera (Coleoptera: Scarabaeidae: Scarabaeinae: Dichotomiini), Journal of Natural History 53 (37), pp. 2231-2351 : 2294-2295

Group 2: Dichotomius (Cephagonus) fissus (Harold) species-group

Diagnosis. among Cephagonus ı this species group is separated by the following combination of characters: clypeo-genal angle sub-straight in malesı obtuse in females (as in spadiceus and some species of ascanius and quadraticeps groups); anterior portion of pronotum with wide emargination and/or declivity ( Figure 16 (a)); elytral interstriae flatı weakly impressed and/or with shiny blue or copper hue near the base and/or with microsculpture (as in D. mundus and D. baiano ) ( Figure 9 (b-e)) and female sixth abdominal ventrite with a pair of triangular projections reaching pygidium margin (as in spadiceus group) ( Figure 7 (b)).

Representatives. 2.1: D. fissus ; 2.2: D. fonsecae ; 2.3: D. baiano ; 2.4: D. fernandosilvai ı 2.5: D. filgueirasi ; 2.6: D. seag .

Figures

Figure 7. (a) Mandible of D. fissus (Harold), inc – incisory lobe (membranous), mo – molar lobe. (b) Maxilla and maxillary palp of same species, mxp – maxillary palp, ga – galea, las – lacinia. (c) Epipharynx of same species. (d) Labrum and labial palpomere of same species. (e) Ventral clypeal process of D. fissceps indicated by white arrow.(f) Antena of same species.esc – escapo, lam – lamella. (g) Macropterous hind wig of D. fissiceps. (h) Brachypterous hindwing of D. ingens.

Figure 9. (a) Abdominal ventrites of a male of D. spadiceus. (b) ventrites of a female of D. spadiceus. (c) abdominal ventrites of a female of D. itatiaiaensisı (d) detail of C; (e) abdominal ventrites of a female of D. fissus. (f) Adbominal ventrites of a female of D. reichei. (g) Abdominal ventrites of a female of D. lucianomourai.

Figure 16. Distribution map of the species in the D. ascanius group.