Scybalocanthon martinezi 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 : 326-327

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Scybalocanthon martinezi Silva & Valois

new species

Scybalocanthon martinezi Silva & Valois   , new species

( Figs. 1P View FIGURE 1 , 4O View FIGURE 4 , 5N View FIGURE 5 , 6D View FIGURE 6 )

Etymology. Named in honour of Antonio Martínez, for his description of Scybalocanthon   and his valuable contributions towards the taxonomy of the genus.

Diagnosis. Specimens of S. martinezi   are similar to those of S. arnaudi   , S. federicoescobari   , S. papaxibe   , S. pinopterus   , and S. uniplagiatus   by having the pronotum uniformly colored, or with one elliptical spot on the central portion ( Figs. 1P View FIGURE 1 , 2A View FIGURE 2 , 1I View FIGURE 1 , 2K View FIGURE 2 , 1D, 1T View FIGURE 1 ); femora almost completely yellow or brown, with black spots only on the tips ( Fig. 3G View FIGURE 3 ); eighth elytral stria with thin carina at the anterior portion ( Fig. 3D View FIGURE 3 ); endophallus with bristles right beside the FLP sclerite ( Figs. 5N, R, H, W, D, Q View FIGURE 5 ); and additional sclerite ( AS) absent ( Figs. 5N, R, H, W, D, Q View FIGURE 5 ). They can be distinguished from those of S. pinopterus   and S. arnaudi   by the strongly asymmetrical parameres; left paramere with acute projection on dorsal margin and bilobate excavation on ventral margin ( Fig. 4O View FIGURE 4 ) (other species with slightly asymmetrical parameres, lacking acute projection and bilobate excavation on dorsal and ventral margins, respectively ( Figs. 4S, E View FIGURE 4 )); from those of S. federicoescobari   , S. papaxibe   , and S. uniplagiatus   by the bilobate excavation of ventral margin of left paramere wide and deep, extending at least one-half of the paramere margin in the lateral view ( Fig. 4O View FIGURE 4 ) (other species with a short bilobate excavation, not reaching one-half of paramere margin in the lateral view ( Figs. 4I, W, R View FIGURE 4 )).

Description. Body. Oval-elongate. Surface opaque (except pronotum), completely microgranulate. Color. Most of pronotum, hypomera (except internal margin), metaventrite, abdominal ventrites, pygidium, middle of femora, and tibiae yellow or light brown. Head, internal margin of hypomera, prosternum, mesoventrite, mesoepisternae, metaepisternae, elytra, trochanters, and proximal and distal portions of femora dark brown. Length. 8.5 mm. Thorax. Pronotum with one brown rounded spot at the anterocentral portion ( Fig. 1P View FIGURE 1 ). In some, spot absent. Anterior angles of pronotum approximately 80°. Lateral margin regularly curved outward, not forming an angle at the middle portion. Elytra. Striae thin and shiny, punctures conspicuous. Eighth stria with a thin carina at the anterior portion. Aedeagus. Parameres strongly asymmetrical ( Fig. 4O View FIGURE 4 ). Dorsal margin of right paramere curved inward, apex obliquely truncate. Ventral margin of right paramere substraight, with a rounded excavation at the basal portion. Dorsal margin of left paramere curved inward from the basal to medial portions, apical portion with a short and pointed projection. Ventral margin of left paramere substraight, with a bilobate excavation from the basal to medial portions. SRP circular, with rounded handle-shaped extension ( Fig. 5N View FIGURE 5 ). FLP short, comma shaped, with three sets of bristles right beside it ( Fig. 5N View FIGURE 5 ). A+SA with two superposed and elongate sclerites ( Fig. 5N View FIGURE 5 ).

Type material. Holotype. ECUADOR: NAPO: Daimi 1, Bosque Sendero , 20.ix.1989, pitfall, Sandoval— 1♂ ( CEMT)   . Paratypes [19 males, 18 females]. ECUADOR: NAPO: Scyasuni , 20–21.x. 1997, 200 m, D. Padilla & I. Tapin— 1♀ ( CEMT)   . COLOMBIA: AMAZONAS, Leticia , 215 m (4°11’20’’S, 69°56’9’’W), 10.vii.1970, H. & A. Howden— 3♂ 1♀ ( CMNC); GoogleMaps   Leticia, 215 m (4°11’20’’S, 69°56’9’’W), 19–25.ii.1972, H. & A. Howden— 1♀ ( CMNC); GoogleMaps   Leticia, 215 m (4°11’20’’S, 69°56’9’’W), 20–25.ii.1972, Peck & Howden, dung traps— 10♂ 4♀ ( CMNC, MZUFPA); GoogleMaps   Los Alpes, Leticia, 213 m (4°4’25’’S, 70°0’5’’W), 23.ii–iii.1974, S. Peck, dung trap— 2♂ 10♀ ( CMNC); GoogleMaps   road end, Leticia, 213 m (4°4’9’’S, 69°59’56’’W), 23.ii–2.iii.1974, S. Peck, dung trap— 4♂ 1♀ ( CMNC) GoogleMaps   .

Distribution. Known from Ecuador and Colombia ( Fig. 6D View FIGURE 6 ). Endemism areas: Brazilian sub-region: Boreal Brazilian dominion: Napo and Imerí provinces (see Morrone 2014; fig. 12).