Scybalocanthon chamorroi Silva & Valois, new species

(Figs. 1F, 4F, 5E, 6C)

Etymology. Named in honor of Willian Chamorro, who collected the specimen examined.

Diagnosis. S. chamorroi is similar to S. acrianus in body coloration (Figs. 1F, A); eighth elytral stria lacking carina on anterior portion; sigmoid shaped of the FLP sclerite (Figs. 5E, A); and endophallus with microbristles right beside the FLP sclerite (Figs. 5E, A). However, S. chamorroi can be easily distinguished from S. acrianus by metallic body surface (Fig. 1F) and impressed elytral striae (Fig. 3A).

Description. Body. Oval-elongate, with variable metallic sheen. Color. Pronotum, lateral portion of hypomera, pygidium, and femora yellow or light brown. Head, internal portion of hypomera, prosternum, mesoventrite, mesoepisternae, metaventrite, metaepisternae, elytra, abdominal ventrites, trochanters, and tibiae dark brown or black.

Length. 5.9 mm. Thorax. Anterior angles of pronotum acute (approximately 70°). Lateral margin regularly curved outward, not forming an angle at the middle portion. Elytra. Striae thin and impressed (Fig. 3A), punctures conspicuous. Eighth stria effaced at the basal third, lacking carina at the anterior portion. Aedeagus. Parameres symmetrical. Dorsal margin of parameres curved inward from the basal to medial portions, apical portion with an almost inconspicuous pointed projection (Fig. 4F). 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. 5E). FLP sigmoid-shaped, with a set of microbristles right beside it (Fig. 5E). A+SA with two superposed and elongate sclerites (Fig. 5E). AS sigmoid-shaped (Fig. 5E).

Type material. Holotype. ECUADOR: Sucumbios, Parque Nacional Sumaco, Río Coca - Río Supayacu, 7.vii. 2006, 380 m, Willian Chamorro— 1♂ (CEMT).

Distribution. Known from Ecuador (Fig. 6C). Endemism areas: Brazilian sub-region: Boreal Brazilian dominion: Napo province (see Morrone 2014; fig. 12).