Dichotomius (Cephagonus) quadraticeps ( Felsche 1901 )

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 : 2303-2304

3.1.: Dichotomius (Cephagonus) quadraticeps ( Felsche 1901) ( Figure 26 )

Pinotus quadraticeps Felsche 1901 ı p. 142 (description)

Pinotus (Cephagonus) quadraticeps ı Luederwaldt 1929 (redescription)

Pinotus quadraticeps ı Blackwelder 1944 ı p. 208

Dichotomius (selenocopris) quadraticeps ı Vaz-de-Mello 2000 ı p. 193

Diagnosis. this species differs from others in the group by the following combined characters: males clypeo-genal angulationı expandedı protuberant and rounded (as D. semicircularis ); males anterior portion of pronotum with wide central emargination (as D. socius and D. filgerasi); males elytra interstriae (except 1stı which is convex) flatı disc smooth and shineı lacking distinct microsculpture viewed under 20x magnification).

● HOLOTYPE of Pinotus quadraticeps (male): Cantagallo {white with black marginsı handwritten}/ quadraticeps Felsche Brasilien {white with purple marginsı handwritten}/Typus {orangeı printed}/Coll. C. Felsche Kauf 20ı 1918 {greenı printed}/Museum für Tierkunde Dresden ( MTD) {whiteı printed}/ LECTOTYPE Pinotus fissiceps Fels. F.Z. Vaz-de-Melloı 2014 red with black marginsı partially handwritten} [ SNSD].

Non Type Material. BRASIL. xii-1962 [1 Ƌ at CEMT]; Rio de Janeiro: Itatiaia. Maromba. 1100 m. 25-xi-1935. Zikán JF [1 Ƌı 1 ♀ at CEMT]; same municipality but xii-1992. C Godinho [1 ♀ at CEMT]; Nova Friburgo. x-1998. E & P Grossi [1 Ƌ at CEMT]; same municipality but Macaé de Cima. i-2000. E & P Grossi [1 ♀ at CEMT]; Santa Catarina: Florianópolis. MIM Hernandéz [1 Ƌ at CEMT]; Rio Vermelho. xii-1958. 700 – 800 m [2 ƋƋ at DZUP]; São Paulo: Mogi das Cruzes. Parque das Neblinas. 23³45 ʹ 49 ” Sı 46 ³12 ʹ 05 ” W. Atlantic Forest with Eucalyptus. Pitfall. 26-ii-2015. JGR Giovanelli [1 Ƌ at CEMT]; São Luiz do Paraitinga. Parque Estadual Serra do Mar (Núcleo Santa Virgínia). xi-2004. M. Uehara-Prado [1 Ƌ at CEMT].

Redescription. colour: blackı shiny. Head: fronto-clypealı genal and inter-ocular surfaces smooth. Gena borders slightly curved inward. Cephalic carina longer than wideı rounded at apex. Pronotum: anterior portion with wide central emargination. Pronotal disc shinyı lacking punctures and with two central weak lobes on anterior portion. Region adjacent to eyesı near anterior anglesı with coarse weakly impressed punctures. Posterior margin with at most some weakly impressed ocellate punctures randomly spaced. Metasternum: sides and anterior portion of anterior lobe covered by long hair. Setigerous punctures equally spaced at sides. Elytra: striae deeply impressed having fine punctures spaced by twice their diameter. First interstriae (near elytral suture) distinctly convex in relation to other interstriae which are flat. Interstriae disc with dark brown colourı lacking microsculpture. Abdomen: sides of each ventrite having two types of setae: groups of one-tofour longer setae and very short adjacent setaeı which have 1/6 of the longer setae length. Puncture of each ventrite interrupted medially as well as groove along the posterior margin of sixth ventrite. Aedeagus ( Figure 22 (cıd-e)). Dorsallyı paramere apexes roundedı convergentı strongly constrained medially; longitudinal excavation absentı basal excavation presentı rounded. Laterallyı subtle declivity from basis towards apex; wide emargination taking 1/3 of paramera lengthı strongly excavated. Ventrallyı basal excavations wideı elliptical – similar to a groove; subgenital plate largeı covering more than half of ventral partı round at basisı strongly emarginated medially.

Morphological variation. males BL: 14 – 19 mmı PW: 8 – 10 mm. Females BL: 16 – 17 mmı PW: 9 mm. Distinguished from males as follows: Head: fronto-clypeal surface striated. Coarse puncture present posterior to cephalic carina. Cephalic carina transversalı forming a weak pair of tubercles. Pronotum: simply convexı lacking lobes. Elytra: striae deeply impressedı punctures separated by twice their diameter. Blue sheen present near basis. Abdomen: sixth ventrite four times larger than fifth and bearing a pair of weak tubercles on the mid-portion ( Figure 7 (e-g)).

Distribution. Brazilian Atlantic forest in the states of Rio de Janeiroı São Paulo and Santa Catarina ( Figure 27 ).

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 22. D. baiano: (a) male dorsal habitus; (b) female dorsal habitus; (c) female ventral habitus; (d) paramera dorsal view; (e) paramera ventral view; (f) paramera lateral view.

Figure 26. D. quadraticeps: (a) Holotype dorsal habitus; (b) recent collected male dorsal habitus; (c) paramera lateral view; (d) paramera dorsal view; (e) paramera ventral view; (f) type labels.

Figure 27. Distribution map of D. quadraticepsı D. semicircularisı D. rondoniaensisı D. paschoali and D. feeri.