Dichotomius (Selenocopris) manni, Nunes, Rafael V. & Vaz-De-Mello, Fernando Z., 2016

Nunes, Rafael V. & Vaz-De-Mello, Fernando Z., 2016, New brachypterous species of Dichotomius (Selenocopris) Burmeister (Coleoptera: Scarabaeidae: Scarabaeinae) with the definition of species groups and taxonomic notes in the subgenus, Zootaxa 4139 (1) : -

Dichotomius (Selenocopris) manni new species

( Fig. 5 )

Material studied. Holotype: Ƌ Serra da Canastra, M.G BRASIL / OUMNH-2003-051 W.D.Hamilton Colln. / Dichotomius manni n. sp., holotype. RVNunes & FZVaz-de-Mello, (det) [ OUMNH].

Diagnosis. In the group, D. manni n. sp. is the largest of the five recognized brachypterous species and is separated from them by the following combined characters: cephalic carina higher than wide bearing a feeble emargination at the apex ( Fig. 5 A); anterior pronotal excavation bearing spaced fine punctures spaced by more than twice their diameter ( Fig. 5 A); central curved lobe delimiting the pronotal disc from the anterior declivity ( Fig. 5 A) and paramera longitudinal excavation taking the apical one third ( Fig. 5 B).

Holotype. male: length: 25.0 mm. Maximum width (pronotum): 14 mm. Black, shiny. Head: dorsal surface smooth, bearing few ocellate punctures s close to the internal border of the eyes. Clypeogenal junction with obtuse angle. Margins of clypeal teeth bearing a row of scattered setae. Ventral clypeal process strongly bifurcated. Cephalic carina higher than wide and bearing a feeble emargination at the apex. Clypeo-genal suture distinct and producing a knob close to the posterior portion. Antennal club with light brown tumescence. Pronotum: wider than long and wider than elytra. Anterior excavation bearing fine punctures spaced by more than twice their diameter. Anterior portion of pronotal lacking lobes. Anterior angle acute. Hypomeron: anterior portion with a lateral band of ocellate setose punctures. Posterior portion almost glabrous with few sparse ocellate setose punctures. Prosternum: covered by ocellate setose punctures: setae do not reach one quarter the length of hypomeron setae. Mesosternum: strongly narrowed, glabrous and opaque medially. Mesepisternum: having ocellate setose punctures. Posterior portion of upper margin ending in an acute angle, reaching pseudoepipleuron ( Figs. 1 B–C). Metasternum: mesometasternal suture indistinct. Ocellate setose punctures present along the margins of the metasternal lobe. Metasternal disc with a feeble longitudinal sulcus producing a feeble posterior concavity. Elytra: shinny, lacking humeral callus. Points of the striae separated by twice their diameter. Elytral interstriae feebly convex. Hind wings: length: 11 mm. Reduced but articulated at the folding region. Basal sclerites glabrous. Subcostal vein intersecting costal axis at its basal quarter. Medial vein extending to folding articulation. Distinct setae present on the basal third of costal axis and at folding articulation. Cubital vein present, anal vein absent. Small developed membranous portion apical to folding articulation with incomplete or weakly-marked venations. Legs: anterior tibial spur strongly bent downward at apical fifth. Anterior tibiae bearing four lateral teeth. Ventral surface of anterior femur smooth and glabrous. Length of the fifth metatarsomere twice the length of the fourth metatarsomere. Abdomen: sternites 1 to 6 glabrous and having ocellate punctures along the anterior border. Pygidium: shinny, smooth, wider than long, lacking punctures. Paramera: having rounded/circular excavations near the basis (dorsal view) and longitudinal excavation toward the apex (lateral and dorsal view). Anterior border of circular/rounded excavation carinates. Longitudinal excavation taking 1/3 the length of paramera. Apex divergent (dorsal view).

Distribution. the holotype is known from Serra da Canastra, south of the state of Minas Gerais, Brazil ( Fig. 8 ).

Etymology. Named after Dr. Darren J. Mann, Head of life collections at Hope Entomological Collections of OUMNH and that kindly landed to us the holotype of this species.

Remarks. D. manni n. sp. is the largest brachypterpus species in Selenocopris . It is similar to D. periotoi by the pronotum and the clypeo-frontal carina. However, the short longitudinal excavation of the paramera are similar to those found in D. paresi n. sp. The label of the holotype does not bring additional information concerning habitat or other natural history information.

Figures

FIGURE 1. (A) Ventral habitus of a female of Dichotomius (Selenocopris) periotoi n. sp. The white arrow at the head indicates the position of the ventral clypeal process and the white at the abdomen indicates the modification at the medial portion of the 6 th sternite; (B) lateral view of the same specimen. The white arrow indicating the position of the mesepisternum.; (C) detail of the mesepisternum of the same specimen. The white arrow indicates the posterior portion of the upper margin of the mesepisternum ending in an acute angle, which is typical of Selenocopris; (D) elytral striae and interstriae of D. (S.) fissus (Gillet); (E) elytral striae and interstriae of D. (S.) fissiceps (Felsche) (quadraticeps group); (F) head and clypeal teeth of D. (S.) bicuspis (Germar); (G) head and clypeal teeth of D. (S.) fissiceps (quadraticeps group); (H) 6 th abdominal sternite of the female of D. (S.) spadiceus (Luederwaldt); (I) 6 th abdominal sternite of the female of D. (S.) punctulatipennis (Luederwaldt) (bicuspis group); (J) 6 th abdominal sternite of the male of D. (S.) ascanius (Harold); (K) 6 th abdominal sternite of the female of D. (S.) ascanius (Luederwaldt); (L) 6 th abdominal sternite of the female of D. (S.) quadraticeps (Felsche).

FIGURE 5. Holotype of Dichotomius (Selenocopris) manni n. sp.: (A) male dorsal habitus; (B) male paramera.

FIGURE 8. Distribution of the brachypterous species of Selenocopris.