Scybalocanthon acrianus Silva & Valois, 2019

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

publication ID

https://doi.org/10.11646/zootaxa.4629.3.1

publication LSID

lsid:zoobank.org:pub:1D47B452-0A40-4BC5-9BBA-C06DEB298C9A

DOI

https://doi.org/10.5281/zenodo.4335169

persistent identifier

https://treatment.plazi.org/id/9D12E557-3A5E-FF96-95F1-FE6AFBCDC70D

treatment provided by

Felipe

scientific name

Scybalocanthon acrianus Silva & Valois
status

new species

Scybalocanthon acrianus Silva & Valois   , new species

( Figs. 1A View FIGURE 1 , 3B View FIGURE 3 , 4A View FIGURE 4 , 5A View FIGURE 5 , 6C View 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, F View FIGURE 1 ); eighth elytral stria lacking carina at the anterior portion; sigmoid shaped of the FLP sclerite ( Figs. 5A, E View FIGURE 5 ); and endophallus with microbristles right beside the FLP sclerite ( Figs. 5A, E View FIGURE 5 ). However, S. acrianus   can be easily distinguished from S. chamorroi   by the opaque body surface ( Fig. 1A View FIGURE 1 ), and weakly impressed elytral striae ( Fig. 3B View 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. 3B View FIGURE 3 ), punctures inconspicuous. Eighth stria effaced at the basal third, lacking carina at the anterior portion. Aedeagus. Parameres symmetrical, obliquely truncate apically ( Fig. 4A View 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. 5A View FIGURE 5 ). FLP sigmoid shaped, with a set of microbristles right beside it ( Fig. 5A View FIGURE 5 ). A+SA with two superposed and elongate sclerites ( Fig. 5A View FIGURE 5 ). AS sigmoid-shaped ( Fig. 5A View 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. 6C View FIGURE 6 ). Endemism areas: Brazilian subregion: South Brazilian dominion: Rondônia province (see Morrone 2014; fig. 12).