Scybalocanthon korasakiae Silva, 2011

Silva, Fernando A. B. & Valois, Marcely, 2019, A taxonomic revision of the genus Scybalocanthon Martínez, 1948 (Coleoptera Scarabaeidae: Scarabaeinae: Deltochilini), Zootaxa 4629 (3), pp. 301-341 : 324

Scybalocanthon korasakiae Silva, 2011

( Figs. 1M , 4M , 5L , 6F )

Scybalocanthon korasakiae Silva, 2011: 2 , figs. 1–2 (original description); Vaz-de-Mello & Silva 2017: 144 , 145 (identification key and distribution).

Diagnosis. Specimens of S. korasakiae are readily distinguishable from all other species by the opaque body surface ( Fig. 1M ); elytra fully dark brown or black; femora noticeably bicolored; ventral margin of parameres with an excavation on its basal one-half ( Fig. 4M ); apex of parameres arrow shaped; endophallus with one set of bristles and dense microbristles right beside the FLP sclerite ( Fig. 5L ); and additional sclerite ( AS) absent ( Fig. 5L ).

Description. Body. Oval, lateral edges rounded. Surface opaque, completely microgranulate. Color. Head, anterior, and posterior edge of pronotum, elytra, prosternum, internal portion of hypomera, mesoventrite, mesoepisternae, procoxae, trochanters, tibiae, mesotarsomeres and metatarsomeres, and proximal and distal parts of femora black with green or blue reflection. Other parts of pronotum, pygidium, most of hypomera, metaventrite, metaepistenum, abdomen, most of mesocoxae and metacoxae, and femora (except the extremities) yellowish brown.

Length. 8.0–11.0 mm. Thorax. Anterior angles of pronotum acute (approximately 80°). Lateral margin irregularly curved outward, forming an obtuse angle at the middle portion. Elytra. Striae thin, punctures inconspicuous. Eighth stria with a thin carina at the anterior portion. Aedeagus. Parameres slightly asymmetrical, apex pointed ( Fig. 4M ). Dorsal margin of parameres slightly curved inward from the basal to medial portions, and slightly curved outward at the apical portion. Ventral margin of parameres curved inward at the basal portion, and substraight from the medial to apical portions. SRP circular, with substraight handle-shaped extension ( Fig. 5L ). FLP short, comma shaped, with a set of bristles and dense microbristles right beside it ( Fig. 5L ). A+SA with two superposed and elongate sclerites ( Fig. 5L ).

Type material. Scybalocanthon korasakiae Silva, 2011 . Holotype ♂ ( MZSP). BRAZIL: MINAS GERAIS, Lavras (21°16.615’S, 44°57.072’W), 950 m, 21.i.2011, C.M.Q. Costa & R. Maciel.

Non-type material [ 4 males, 4 females]. BRAZIL: MINAS GERAIS, Conceição dos Ouros, Rio Sapucai (45°45’50”W, 22°25’22”S), 28.ii.1995, G.P. Almeida— 1♂ 1♀ ( CEMT); Lavras (21°16.615’S, 44°57.072’W), 950 m, 21.i.2011, C.M.Q. Costa & R. Maciel— 1♂ ( CEMT); Lavras, Mata do Capivari (44°16’57”W, 21°16’25”S), xii.2001, G. Schiffler— 1♀ ( CEMT); Cordisburgo, Fazenda Pontinha, xii.1997, Vaz-de-Mello— 1♂ ( CEMT); Igara- pé (44°17’59”W, 20°04’16”S), 3.i.1995, W.W. Koller— 1♀ ( CEMT); Ribeirão Vermelho, 30.x.2003, Marcelo— 1♂ ( CEMT) . SÃO PAULO: Campos do Jordão , x.2002, G.P. Almeida— 1♀ ( CEMT) .

Distribution. Known from Brazil (Minas Gerais and São Paulo) ( Fig. 6F ). Endemism areas: Chacoan sub-region: Parana dominion: Cerrado and Parana Forest provinces (see Morrone 2014; fig. 12). This species is distributed in the areas of Atlantic forest in the continental slope of the Mantiqueira mountain range and other areas of the forest inside Cerrado dominion but related to the Atlantic Forest tributaries ( Vaz-de-Mello & Silva 2017).

Figures

FIGURE 1. Species of Scybalocanthon, dorsal habitus. A, Scybalocanthon acrianus new species; B, S. adisi new species; C, S. aereus; D, S. arnaudi new species; E, S. batesi; F, S. chamorroi new species; G, S. cyanocephalus; H, S. darlingtoni; I, S. federicoescobari new species; J, S. haroldi new species; K, S. kaestneri; L, S. kelleri; M, S. korasakiae; N–O, S. maculatus; P, S. martinezi new species; Q–R; S. moniliatus; S. S. nigriceps; T. S. papaxibe new species. Scale bar: 2 mm.

FIGURE 4. Aedeagus, detail of parameres in left and right view. A, Scybalocanthon acrianus new species; B, S. adisi new species; C, S. aereus; D, S. aereus (lectotype); E, S. arnaudi new species; F, S. chamorroi new species; G, S. cyanocephalus; H, S. darlingtoni; I, S. federicoescobari new species; J, S. haroldi new species; K, S. kaestneri; L, S. kelleri; M, S. korasakiae; N, S. maculatus; O, S. martinezi new species; P, S. moniliatus; Q, S. nigriceps; R, S. papaxibe new species; S, S. pinopterus; T, S. pygidialis; U, S. sexspilotus; V, S. trimaculatus; W, S. uniplagiatus. Scale bar: 0.5 mm.

FIGURE 5. Sclerites of endophallus. Superior right peripheral (SRP) sclerite. Fronto-lateral peripheral (FLP) sclerite. Complex of axial and subaxial (A+SA) sclerites.Additional sclerite (AS). Set of microbristles (Smb). Set of bristles (Sb). A, Scybalocanthon acrianus new species; B, S. adisi new species; C, S. aereus; D, S. arnaudi new species; E, S. chamorroi new species; F, S. cyanocephalus; G, S. darlingtoni; H, S. federicoescobari new species; I, S. haroldi new species; J. S. kaestneri; K, S. kelleri; L, S. korasakiae; M, S. maculatus; N, S. martinezi new species; O, S. moniliatus; P, S. nigriceps; Q, S. papaxibe new species; R, S. pinopterus; S, S. pygidialis (specimen from Amazonas, Brazil); T, S. pygidialis (specimen from Cayenne, French Guiana); U, S. sexspilotus; V, S. trimaculatus; W, S. uniplagiatus. Scale bar: 0.5 mm.

FIGURE 6. Known distribution of species of Scybalocanthon.