Dichotomius (Cephagonus) lucianomourai, Nunes & Vaz-de-Mello, 2019

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 : 2334-2335

5.3.: Dichotomius (Cephagonus) lucianomourai new species

( Figure 46 (a-e))

Diagnosis. this species is differentiated among the group by the following combined characters: males pronotal disc having at most two weak knobs on anterior portion (as D. fernandosilvai and D. clypeatus ); paramera very longı having more than half of phalobasis length and distance between triangular projections on female sixth ventrite equal to 1/3 of ventrite length (as on D. spadiceus ).

● HOLOTYPE (male): BRASIL: Rio Grande do Sul. Derrubadas. PE Turvo. Pitfall . 31- x-2003 [ CEMT ];

● PARATYPE (female): same data of Holotype [ CEMT].

Description (Holotype). male BL: 13 mmı PW: 7 mm. Colour: blackı shiny. Head: frontoclypeal surface smooth. Inter-ocular space-lacking puncturesı at most very fine ones (viewed under 30x magnification) near eyes. Gena borders are straight. Cephalic horn rounded at apex. Pronotum: anterior portion having a subtle and narrow emargination. Pronotal disc smoothı shiny having a pair of central knobs on anterior portion. Posterior margin with ocellate punctures restricted to posterior angles. Posterior angle excavated and with groups of 5 ocellate punctures. Metasternum: sides and anterior portion of anterior lobe with ocellate setigerous puncturesı setae shortı with similar size to those on legs. Elytra: striae weakly impressed with weak punctures. Punctures separated by twice their diameter. Puncture on striae basis expanded forming a small fovea. Interstriae flatı lacking microsculpture. Abdomen: punctures of each ventrite anterior margin interrupted medially. ventrites lacking setigerous punctures. Aedeagus ( Figure 46 (c-e)): paramera having twice the length of phalobasisı very long. Dorsallyı lacking basal and longitudinal excavation; apexes roundedı convergent. Laterallyı subtle declivity. Posterior margin with wide emargination near to phalobasis junction. Ventrallyı basis with a wide central excavation. Subgenital plate emarginated apicallyı rounded at basis.

Morphological variation. male and female BL: 13 mmı PW: 7 mm. and pronotum width 7 mm. Female is distinguished from the male as follows: Head: fronto-clypeal surface transversely wrinkledı interocular space smooth. Cephalic carina low with two acute tubercles on apex. Pronotum: simply convexı punctures weaker than on males but following same distribution pattern. Elytra: striae deeply impressedı punctures separated by twice their diameter. Basis with blue sheen. Abdomen: sixth ventrite bearing a pair of triangular projections reaching pygidium apical margin; distance between triangular projections equal to 1/10 of ventrite length. Disc with very fine puncture medially (viewed under 20x magnification).

Etymology. named after our friend Dr. Luciano Moura (Universidade Federal do Rio Grande do Sulı Brasil)ı coleopterologist specialist on Chrysomelidaeı friend and scientific partner of both authors.

Distribution. municipality of Derrubadası west of the state of Rio Grande do Sulı Brazil ( Figure 44 ).

Figures

Figure 44. Distribution map of D. spadiceusı D. lucianomourai and D. itatiaiaensis.

Figure 46. D. lucianomourai: (a) male dorsal habitus; (b) female ventral habitus; (c) paramera dorsal view; (d) paramera ventral view; (e) paramera lateral view.