Dichotomius (Cephagonus) semicircularis ( Luederwaldt 1929 )

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 : 2306-2307

3.3.: Dichotomius (Cephagonus) semicircularis ( Luederwaldt 1929) ( Figure 30 )

Pinotus (Cephagonus) semicirculare Luederwaldt 1929 ı p. 129 (description)

Pinotus (Cephagonus) rugosipennis Luederwaldt 1930 ı p. 120 (description)

Pinotus (Cephagonus) rugosipennis ı Luederwaldt 1931 ı p. 357 (synonim of D. semicirculare ) Pinotus rugosipennis ı Blackwelder 1944 ı p. 208

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

Diagnosis. this species differs from D. quadraticeps ı the other species in the group by combination of both following characters: males pronotum anterior portion widely emarginated; elytra interstriae disc sculpture chagrinated (as in D. simulans ) ( Figure 26 (g)) and 3) 1st interstriae disc sculpture has smooth sculpture and has a noticeable different shine from the rest of elytral disc.

● HOLOTYPE of Pinotus semicirculare and P. rugosipennis : (male) ( Figure 30 (a-b)): Santos (Conceição do Itanhem) I- 1928ı R. Spitz leg. {white with black marginsı partially handwritten}/ Pinotus bicuspis forma E {whiteı handwritten}/ Pinotus (C.) rugosipennis Lüderwalt. det.29 {whiteı printed}/25911 {whiteı printed} [ MZSP].

Non type material examined. BRASIL: São Paulo: São Bernardo do Campo. x-2001. P Balduino [2 ƋƋ at CEMT].

Redescription. colour: blackı shiny. Head: fronto-clypealı genal and inter-ocular surfaces smooth except for few weakly impressed fine punctures evenly spaced. Gena borders slightly curved inward. Cephalic carina longer than wideı rounded apex. Pronotum: anterior portion with wide central emargination with two central weak knobs. Pronotal disc shinyı lacking punctures. Region adjacent to eyes near anterior angles with a row of weakly impressed ocellate punctures. Posterior margin with some ocellate puncturesı mainly concentrated at posterior angle. Metasternum: sides and margins of anterior portion of anterior lobe covered by long hair. Anterior portion glabrous. 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 and with smooth sculpture and notable different shine. Other interstriae disc chagrinated. Abdomen: sides of each ventrite having two types of setae: groups of five-to-ten longer setae and very short adjacent setaeı which have 1/6 the longer setae length. Puncture of each ventrite interrupted medially as well as groove along the posterior margin of the sixth ventrite. Aedeagus ( Figure 30 (d-f)): Dorsallyı strongly constrained since basal excavation; apexes roundedı convergent; longitudinal excavation absentı basal-rounded excavation present. Laterallyı subtle declivity from the basis towards apex; wide excavation taking more than half of paramera length. Ventrallyı basal excavations lackingı produced into knobs; subgenital plate taking more than half of ventral paramera surfaceı rounded at basisı emarginated apically and also visible dorsally.

Morphological variation. males BL: 15 – 16 mmı PW: 8 – 9 mm. Females are unknown to us.

Distribution. Santos and São Bernardo do Campo municipalitiesı state of São Pauloı Brazil ( Figure 27 ).

Figures

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.

Figure 30. D. semicircularis: (a) Holotype male dorsal habitus; (b) type labels; (c) male dorsal habitus; (d) paramera dorsal view; (e) paramera ventral view; (f) paramera lateral view; (g) detail of 1st and 2nd elytral intersriae.