Scybalocanthon chamorroi 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: 316

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Scybalocanthon chamorroi Silva & Valois

new species

Scybalocanthon chamorroi Silva & Valois  , new species

( Figs. 1FView FIGURE 1, 4FView FIGURE 4, 5EView FIGURE 5, 6CView FIGURE 6)

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

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. 3AView FIGURE 3), 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. 4FView FIGURE 4). 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. 5EView FIGURE 5). FLP sigmoid-shaped, with a set of microbristles right beside it ( Fig. 5EView FIGURE 5). A+SA with two superposed and elongate sclerites ( Fig. 5EView FIGURE 5). AS sigmoid-shaped ( Fig. 5EView FIGURE 5).

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. 6CView FIGURE 6). Endemism areas: Brazilian sub-region: Boreal Brazilian dominion: Napo province (see Morrone 2014; fig. 12).