Psilodon buhrnheimi Grossi and Aguiar, 2014

Grossi, Paschoal Coelho & Aguiar, Nair Otaviano, 2014, Discovery of a Third Stag Beetle Genus in the Amazonian Region, with Description of a New Species ofPsilodonPerty (Coleoptera: Lucanidae: Syndesinae: Syndesini), The Coleopterists Bulletin 68 (1), pp. 83-90 : 83-90

Psilodon buhrnheimi Grossi and Aguiar , new species

( Figs. 2–11 )

Description. Holotype male ( Figs. 3, 4 , 10 ) Body convex, somewhat elongate and with subparallel sides. Body surface almost glabrous, with scattered setose areas on head, mandibles, legs, and venter. Length: 14.30 mm; total pronotal width 5.35 mm. Color: Body completely brown, with some lighter areas on pronotal margins, legs, and ventrally. Head: Transverse, about 2.2X wider than long; dorsal surface completely punctate, punctures denser on anterior angles, frons and vertex; each puncture with an elongate seta; surface anteriorly to suprantennal projection and anterior angles distinctly more setose; suprantennal projection elongate, carinate; anterior margin microrugose, alutaceous, wider at middle; lateral angles rounded. Mandibles symmetrical, about 1.6X longer than head; with acute and moderately upturned apices, weakly curved laterally, with internal surface visible from above and distinctly excavated anteriorly; surface setose, densely on distal internal face and proximal external face; setae long; external surface moderately punctate; punctures more densely distributed on medial areas; external tooth (a) erect, weakly projected forward, sides divergent to base, and apex truncate ( Fig. 3 ); internal tooth () obtuse with rounded apex, directed inward and not enlarged; distance between lateral externally lobed base (b) and internal tooth equals 0.28 mm, forming an elongate concavity, becoming wider distally, and laterally carinate. Thorax: Pronotum convex, transverse, about 1.3X wider than long and as wide as elytra; surface completely and strongly punctate; punctures deep, each with a minute central seta; setae denser near margins and inside the longitudinal furrow; furrow shallow, becoming straight anteriorly, ending in a longitudinal vertical, anteriorly rounded carina, exceeding anterior pronotal angles and pointed downward; border incomplete anteriorly, lateral borders crenulate and almost parallel, with minute flattened scale like upward setae, posterior margin sinuate, with a weak emargination at middle; anterior angles obtuse and rounded. Scutellum: Elongate, with small, scattered punctures; posteriorly rounded. Elytra: Surface totally striated, with 5 pairs of deeply impressed, strongly bipunctate striae; interstriae carinate, convex; 2nd, 4th, 6 th, and 8th intervals elevated and punctate; punctures small and sparse; humeri not striate, finely punctate and with an acute external tooth-like projection; apex, at elytral declivity, irregularly convex at the joint of interstriae 4-7. Legs: Anterior tibiae with 4–5 external teeth, decreasing in size towards base and with several smaller teeth among and before them; apical tooth downturned; dorsal surface with a longitudinal carina, carina ending at 2nd tooth; ventral surface toothed with 4 conical teeth, at apex with a laminate, plate-like tooth. Mesotibiae with 4 flattened teeth, increasing in size from base to apex; tibial apex with 3–4 tooth-like projections; metatibiae with 2–3 external teeth, apex with 5 projections. Abdomen: Abdominal sternites densely micropunctate; punctures fine, becoming coalescent near posterior border. Genitalia symmetrical ( Figs.7–9 ); genital capsule elongate, with dorsal plate with an acute middle discal angle; lateral plates subtriangular, membranous at middle and elongated distally into 2 more sclerotized struts; ventral plate with rounded base, with scattered, short setae; aedeagus moderately deeply sclerotized, pigmented, less so at parameral apex and base of median lobe; parameres internally concave, glabrous and thickened; in dorsal view with internal sides parallel; median lobe as along as parameres, ventral surface flattened and apex upturned; basal piece constricted distally and lobed.

Female. Unknown.

Variation. Male paratype ( Figs. 2, 5–6 ). Length: 13.14 mm. Width: 5.24 mm. Color: Ventral surface and legs lighter. Head: Mandibles less developed, more curved, and with internal tooth smaller. Elytra: Humeri with more pronounced projection.

Type Material. Holotype male (dissected), labeled: Brasil, Amazonas , Coari / Rio Urucu, próx. IMT-1,/ 4°49′33.00″S S\ 65°01′49″W,/ 24–25-ix- 1995, 89 m, P.F./ Buhrnheim and N.O.Aguiar / BLB [black light bulb] - Pennsylvania ( CZPB) . Paratype male (dissected), labeled: Brasil, AM , Guajará ,/ Ramal do Gama km 12,/ 07°27′16″/72°38′56″,/ 06–19.xi.2006, tronco,/ F°. [Filho] F. F. Xavier leg. ( EPGC) .

Etymology. The specific epithet is in honor of the late Dr. Paulo Friedrich Bührnheim, who collected extensively in the Amazonian Region, making several contributions to the Brazilian Passalidae , organizing a great insect collection, developing researchers, and disseminating knowledge of the Amazonian fauna.

Figures

Figs. 2–6. Psilodon buhrnheimi. 2) Paratype, doral habitus; 3) Holotype, head and pronotum, lateral view; 4) Holotype, head and pronotum, dorsal view; 5) Paratype, head and pronotum, dorsal view; 6) Paratype, head and pronotum, lateral view. Scale bars: Fig. 2 = 2 mm; Figs. 3–6 = 5 mm.

Figs. 7–10. Psilodon buhrnheimi. 7–9) Aedeagus, ventral, dorsal, and lateral views, respectively; 10) Holotype. Scale bars: Figs. 7–9 = 1 mm; Fig. 10 = 2 mm.

Fig. 11. Map of the known distribution of Lucanidae in the Amazonian Region. Crosses = Brasilucanus alvarengai Vulcano and Pereira; square = Brasilucanus acomus Ratcliffe; circles = Lucanobium guianense Paulsen; triangles = Psilodon buhrnheimi; open circles = Charagmophorus lineatus lineatus Waterhouse; open triangle = Charagmophorus lineatus eikoae Nagai; open square = Charagmophorus umedai Nagai.