Scybalocanthon acrianus Silva & Valois,

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: 308-309

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Scybalocanthon acrianus Silva & Valois

new species

Scybalocanthon acrianus Silva & Valois  , new species

( Figs. 1AView FIGURE 1, 3BView FIGURE 3, 4AView FIGURE 4, 5AView FIGURE 5, 6CView FIGURE 6)

Etymology. The specific name is a Latinization of the demonym for the Brazilian state of Acre and should be treated as an adjective.

Diagnosis. Specimens of S. acrianus  are similar to those of S. chamorroi  new species. in body coloration ( Figs. 1A, FView FIGURE 1); eighth elytral stria lacking carina at the anterior portion; sigmoid shaped of the FLP sclerite ( Figs. 5A, EView FIGURE 5); and endophallus with microbristles right beside the FLP sclerite ( Figs. 5A, EView FIGURE 5). However, S. acrianus  can be easily distinguished from S. chamorroi  by the opaque body surface ( Fig. 1AView FIGURE 1), and weakly impressed elytral striae ( Fig. 3BView FIGURE 3).

Description. Body. Oval, lateral edges rounded. Surface opaque, completely microgranulate. Color. Pronotum, lateral portion of hypomera, and legs yellow or light brown. Other parts dark brown. Length. 6.0–7.0 mm. Thorax. Anterior angles of pronotum approximately 85°. Lateral margin regularly curved outward, not forming an angle at the middle portion. Elytra. Striae thin and shiny, weakly impressed ( Fig. 3BView FIGURE 3), punctures inconspicuous. Eighth stria effaced at the basal third, lacking carina at the anterior portion. Aedeagus. Parameres symmetrical, obliquely truncate apically ( Fig. 4AView FIGURE 4). Dorsal margin of parameres curved inward. Ventral margin of parameres curved inward at the basal portion and substraight from the medial to apical portions. SRP circular, with curved handle-shaped extension ( Fig. 5AView FIGURE 5). FLP sigmoid shaped, with a set of microbristles right beside it ( Fig. 5AView FIGURE 5). A+SA with two superposed and elongate sclerites ( Fig. 5AView FIGURE 5). AS sigmoid-shaped ( Fig. 5AView FIGURE 5).

Type material. Holotype. BRAZIL: ACRE: Rio Branco , UFAC [Universidade Federal do Acre], secondary forest, ii.1997, F.Z. Vaz-de-Mello— 1♂ ( CEMT)  . Paratypes. BRAZIL: ACRE: Rio Branco , UFAC [Universidade Federal do Acre], secondary forest, ii.1997, F.Z. Vaz-de-Mello— 3♀ ( CEMT)  . BOLIVIA: EL BENI, Guanay (12°31’S, 66°49’30’’W), xi.1992, L. Peña— 1♂ ( CMNC)GoogleMaps  .

Distribution. Known from Brazil (Acre) and Bolivia (El Beni) ( Fig. 6CView FIGURE 6). Endemism areas: Brazilian subregion: South Brazilian dominion: Rondônia province (see Morrone 2014; fig. 12).