Dichotomius (Luederwaldtinia) angeloi, Nunes, Rafael V., Carvalho, Marcela S. G. & Vaz-De-Mello, Fernando Z., 2016

Nunes, Rafael V., Carvalho, Marcela S. G. & Vaz-De-Mello, Fernando Z., 2016, Taxonomic review of the Dichotomius (Luederwaldtinia) assifer (Eschscholtz) species-group (Coleoptera: Scarabaeidae), Zootaxa 4078 (1), pp. 230-244 : 239-241

Dichotomius (Luederwaldtinia) angeloi sp. nov.

( Figures 5 A–E)

Material examined. Holotype: BRASIL: Minas Gerais, Vargem Bonita, Parque Nacional Serra da Canastra. Mata de Galeria. 28º18’39”S, 46º31’30”W. 865 mosl. 02-XI-2011. MF Souza / Dichotomius (L.) angeloi sp. nov., Holotype. R.V.Nunes, F.Z.Vaz-de-Mello and M.S.Gigliotti, 2013 [♂ CEMT]. Paratypes: same data of Holotype [13♂, 8♀ CEMT]; Uberaba. X-1995, FZ Vaz-deMello [7♂, 10♀ CEMT]; Vazante. XII-1997, S Lourenço Jr [6♂, 9♀ CEMT]; Lapinha. XI-1981. C Godinho [1♀ CEMT]; Montes Claros. I-2000. Cerrado R3/P2 #1. Louzada & Louzada [1♂ CEMT]; Diamantina. Campus UFVJM. 19-XII-2005. SL Assis Junior [1♂ CEMT]; Goiás, São Jorge, Vale da Lua. 14º10’55”S; 47º47’36”W. RipFor., hum.faec. I-2011. RV Nunes & MS Gigliotti [9♂, 4♀ CEMT]; Distrito Federal, Brasília. Fazenda Água Limpa (Unb). 15°56'34.83"S, 47°56'13.44"W. 10-XII-2014. Pitfall fezes humanas. MSGCarvalho lgt [13♂, 12♀ CEMT].

Diagnosis. Dichotomius angeloi sp. nov. is separated of the other species in the group by the following combination of characters: males cephalic carina as wide as high, emarginated medially with a tubercle at each apex ( Figs 5 A, C); females cephalic carina very low, bearing a pair of tubercle ( Fig. 5 B); pronotal disc bearing well defined puncture ( Figs 1 E, 5A–B); weak central lobe delimiting the pronotal disc anteriorly ( Figs 5 A, C) and elytral interstriae opaque, striated/wrinkled bearing few dispersed fine punctures ( Figs 1 H, 5A–B).

Holotype male. Length: 17 mm. Maximum width (pronotum): 10 mm. Dorsal surface black, opaque. Darkbrown pilosity on ventral surface. Head: dorsal surface wrinkled. Clypeus with a central emargination separating two rounded clypeal teeth. Clypeal margin more distinct at the clypeal teeth. Ventral clypeal process bifurcated. Clypeo-genal junction not angled. Cephalic carina taller than wide, bearing a tubercle on each apex and medially emarginated. Interocular space shining, smooth and lacking punctures. Clypeo-genal suture distinct. Antenal club with red tumescence. Pronotum: wider than long, width equal to that of elytra. Pronotum covered by coarse puncture, weaker on the center of the pronotal disc and coarser at the anterior declivity and anterior angles. Central (not bifurcated) lobe delimiting the pronotal disc anteriorly. Median longitudinal groove absent. Anterior angles rounded. Hypomeron: anterior portion bearing a well-defined excavation that is delimited by a dense brush of setae. External band of the hypomeron bearing long setae with almost the same length of the setae at the excavation and that can be seen on dorsal view. Prosternum: bearing spaced ocellate setigerous punctures. Setae short, reaching at most 1/5 the length of metasternal pilosity. Mesosternum: strongly narrowed medially and covered by ocellate setigerous punctures. Setae short, reaching at most 1/5 the length of metasternal pilosity. Mesepisternum: fully covered by ocellate setigerous punctures. Pilosity dense, setae with the same length of those found at the metasternum. Upper margin of the posterior portion with a triangular projection that almost reaches the pseudoepipleuron. Metasternum: mesometasternal suture distinct. Pilosity dense and covering mainly the metasternal suture. Setigerous punctures restricted mainly to the margins of the mestasternal lobe but enroaching onto middle of this lobe after its midpoint. Longitudinal sulcus present, terminating in posterior concavity which bears small ocellate setigerous punctures. Elytra: opaque, interstriae convex, striated/wrinkled with a few disperse fine punctures. Discal striae bearing small depressions, not distinct punctures. Legs: apex of the anterior tibiae bearing a tuft of setae. Anterior calcar spatulate. Anterior tibiae tridendate, teeth confined to apical one-half of lateral margin. Apex of the metatibiae bearing a medial tooth ( Fig. 1 D). Ventral surface of the profemur bearing setigerous punctures; similar punctures present marginally on the meso and metafemur but are restricted to their margins or apex. Tarsi densely covered by dark brown pilosity. Abdomen: sixth sternite very narrowed medially. Setigerous punctures present on sides near anterior margin. Pygidium: as long as wide, bearing fine punctures equally spaced (8x). Paramera: as on Figs 5 D–E.

Variation in the paratypes. Body length varies from 14–20 mm and pronotum width from 9–11 mm. Smaller males bear a lower cephalic carina while the central lobe that delimits the pronotal disc of the anterior declivity is less developed. Females ( Fig. 5 B) are smaller, bear denser and longer pilosity on ventral surface and are also differentiated as follows: Head: cephalic carina low, widely emarginated and bearing an acute tubercle at each apex. Pronotum: anterior declivity and central lobe are not present. Pronotal disc punctures deeper. Abdomen: sixth sternite not shortened medially and bearing a central knob. The Paratypes belonging to the locality of Chapada dos Veadeiros, in the Brazilian state of Goiás have the dorsal surface very opaque while pilosity is vivid red.

Distribution. this species has a disjunct distribution at central Brazil: north (Triângulo Mineiro and near Vale do Jequitinhonha) and center (Serra da Canastra) of the state of Minas Gerais and north of the state of Goiás, at Chapada dos Veadeiros ( Fig. 7 ).

Etymology. As Martínez & Pereira did in 1967 (see next species), this species is named after Angelo B. M. Machado as an acknowledgement of the enlightenment he brought to generations of Brazilians on conservation and environmental education issues, and to the third author in particular for long-term friendship, support and encouragement in good and in difficult moments.

Figures

FIGURE 1. Diagnostics characters of Dichotomius (Luederwaldtinia) assifer species-group. A – B. excavation of the anterior portion of the hypomeron indicated by the white arrows; C. setae concentrated at the sides of abdominal sternites indicated by the black arrows. The sixth abdominal sternite, wider than the other sternites and bearing a central knob; D. medial tooth at the apex of hind tibiae indicated by the black arrow; E. pronotal disc surface showing well defined punctures typical on D. affinis, D. angeloi sp. nov. and D. machadoi; F. pronotal disc surface generally lacking punctures, smooth and shining, typical of D. assifer and D. louzadai sp. nov.; G. smooth and shining elytral interstriae disc, typical of D. assifer and D. louzadai sp. nov.; H. wrinkled interstriae disc, typical of D. affinis, D. machadoi and D. angeloi sp. nov.

FIGURE 5. Dichotomius angeloi sp. nov. A. dorsal habitus of the male; B. dorsal habitus of the female; C. fronto-lateral view of the male head and pronotum; D. dorsal view of the paramera; E. lateral view of the aedeagus.

FIGURE 7. Distribution map of species in the Dichotomius (L uederwaldtinia) assifer species-group.