Scybalocanthon martinezi 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: 326-327

publication ID

publication LSID


persistent identifier

treatment provided by


scientific name

Scybalocanthon martinezi Silva & Valois

new species

Scybalocanthon martinezi Silva & Valois  , new species

( Figs. 1PView FIGURE 1, 4OView FIGURE 4, 5NView FIGURE 5, 6DView 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. 1PView FIGURE 1, 2AView FIGURE 2, 1IView FIGURE 1, 2KView FIGURE 2, 1D, 1TView FIGURE 1); femora almost completely yellow or brown, with black spots only on the tips ( Fig. 3GView FIGURE 3); eighth elytral stria with thin carina at the anterior portion ( Fig. 3DView FIGURE 3); endophallus with bristles right beside the FLP sclerite ( Figs. 5N, R, H, W, D, QView FIGURE 5); and additional sclerite ( AS) absent ( Figs. 5N, R, H, W, D, QView 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. 4OView FIGURE 4) (other species with slightly asymmetrical parameres, lacking acute projection and bilobate excavation on dorsal and ventral margins, respectively ( Figs. 4S, EView 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. 4OView FIGURE 4) (other species with a short bilobate excavation, not reaching one-half of paramere margin in the lateral view ( Figs. 4I, W, RView 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. 1PView 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. 4OView 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. 5NView FIGURE 5). FLP short, comma shaped, with three sets of bristles right beside it ( Fig. 5NView FIGURE 5). A+SA with two superposed and elongate sclerites ( Fig. 5NView 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. 6DView FIGURE 6). Endemism areas: Brazilian sub-region: Boreal Brazilian dominion: Napo and Imerí provinces (see Morrone 2014; fig. 12).