Scybalocanthon ashei, Silva, Fernando A. B. & Genier, Francois, 2019
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publication ID |
https://dx.doi.org/10.3897/zookeys.884.39322 |
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persistent identifier |
https://treatment.plazi.org/id/656E1DFA-1C07-5C7B-A80D-56082C7957BE |
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treatment provided by |
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scientific name |
Scybalocanthon ashei |
| status |
sp. nov. |
Scybalocanthon ashei sp. nov. Figs 1 A–G View Figure 1 , 5C View Figure 5
Material studied.
Holotype. PERU: MADRE DE DIOS, Reserva Cuzco Amazonica, 15 km NE Puerto Maldonado, 69°03'W, 12°33'S, 200m, 4.VII.1989, Ashe and Leschen legs (1♂ CMNC). Paratypes [5♂ and 7♀]. PERU: MADRE DE DIOS, Reserva Cuzco Amazonica, 15 km NE Puerto Maldonado, 69°03'W, 12°33'S, 200m, 7.VII.1989, Ashe and Leschen legs (1♀ CMNC); Reserva Cuzco Amazonica, 15 km NE Puerto Maldonado, 69°03'W, 12°33'S, 200m, 13.VII.1989, Ashe and Leschen legs (1♀ CMNC); Reserva Cuzco Amazonica, 15 km NE Puerto Maldonado, 69°03'W, 12°33'S, 200m, 17.VI.1989, Ashe and Leschen legs (1♀ CMNC); Reserva Cuzco Amazonica, 15 km NE Puerto Maldonado, 69°03'W, 12°33'S, 200m, 24.VI.1989, Ashe and Leschen legs (1♀ CMNC); Reserva Cuzco Amazonica, 15 km NE Puerto Maldonado, 69°03'W, 12°33'S, 200m, 26.VI.1989, Ashe and Leschen legs (1♂ CMNC, 1♂ MZUFPA, 1♂ CEMT); Reserva Cuzco Amazonica, 15 km NE Puerto Maldonado, 69°03'W, 12°33'S, 200m, 20.VI.1989, Ashe and Leschen legs (1♂ CMNC); Reserva Cuzco Amazonica, 15 km NE Puerto Maldonado, 69°03'W, 12°33'S, 200m, 30.VI.1989, Ashe and Leschen legs (1♀ CMNC); Parque Nacional del Manú, 15-30.VIII.1986, A. Forsyth leg. (1♂ and 1♀ CMNC, 1♀ MZUFPA).
Diagnosis.
Specimens of Scybalocanthon ashei sp. nov. ( Fig. 1A View Figure 1 ) are similar to those of S. arnaudi ( Fig. 2D View Figure 2 ), S. federicoescobari ( Fig. 2F View Figure 2 ), S. martinezi ( Fig. 2I View Figure 2 ), S. papaxibe ( Fig. 2J View Figure 2 ), S. pinopterus ( Fig. 2 K–M View Figure 2 ), and S. uniplagiatus ( Fig. 2O View Figure 2 ) in having the pronotum uniformly colored, or with one elliptical spot on the central portion; femora almost completely yellow or brown, with black spots only on the tips ( Fig. 1B View Figure 1 ); eighth elytral stria with thin carina anteriorly (see Silva and Valois 2019, fig. 3D); endophallus with bristles right beside the FLP sclerite ( Fig. 1E View Figure 1 ); and additional sclerite (AS) absent. They can be distinguished from those of S. arnaudi and S. pinopterus , however, by the strongly asymmetrical parameres; left paramere with acute projection on dorsal margin and bilobate excavation on ventral margin ( Fig. 1C, D View Figure 1 ) (other species with slightly asymmetrical parameres, lacking acute projection and bilobate excavation on dorsal and ventral margins ( Fig. 3D, K–N View Figure 3 ); from those of S. federicoescobari , S. martinezi , S. papaxibe , and S. uniplagiatus by the bilobate excavation of the ventral margin of the left paramere wider, extending along two-third of the paramere margin ( Fig. 1D View Figure 1 ) (in S. federicoescobari ( Fig. 3F View Figure 3 ) and S. papaxibe ( Fig. 3J View Figure 3 ) the excavation extending along one-fourth of the paramere margin; in S. uniplagiatus ( Fig. 3P View Figure 3 ) the excavation extending along one-third of the paramere margin; in S. martinezi ( Fig. 3I View Figure 3 ) the excavation is deeper, extending about one-half of the paramere margin).
Description.
Body: Oval-elongated ( Fig. 1A View Figure 1 ). General surface opaque, completely microgranulated. Pronotum with silky sheen. Color: Most of pronotum, hypomera (except internal and posterior margins), metaventrite, metepisterna, abdominal ventrites, pygidium, and middle of femora yellow or light brown. Head, internal and posterior margins of hypomera, prosternum, mesoventrite, mesepisterna, elytra, trochanters, proximal and distal portions of femora, tibiae and tarsomeres dark brown. Length: 8.8-11.5 mm. Head: Dorsal surface with fine microgranulation. Clypeal margin with two small, triangular central teeth. Eye comma-shaped in dorsal view. Thorax: Pronotum twice as wide as long, anterior angles acute, directed forward. Pronotum usually with one brown rounded spot at the anterocentral portion; in some specimens, spot absent. Anterior angles of pronotum approximately 80°. Lateral margin strongly curved outward. Elytra: Striae thin and shiny, punctures conspicuous. Eighth stria with a thin carina anteriorly. Legs: Protibiae with three lateral teeth. Anterior and posterior edge of meso- and metafemora not margined. Mesotibiae smoothly arched toward body. Metatibiae almost straight. First meso- and metatarsomeres short, external margin half the length of second tarsomere, and obliquely truncated apically. Lateral margins of tarsomeres parallel, forming even margin along length of tarsus. Overall shape of meso- and metatarsomeres 2-4 varying from quadrate to rectangular. Dorsal (internal) surface of mesotibiae with dense setae, randomly distributed. Secondary sexual characters: Females can be distinguished from males by the sixth abdominal ventrite longer than in males, and the anterocentral portion of sixth abdominal ventrite more swollen than the posterocentral portion in lateral view (males have, in general, the posterocentral portion more swollen). Genital capsule: Parameres strongly asymmetrical ( Fig. 1C, D View Figure 1 ). Dorsal margin of right paramere curved inward, apex obliquely truncated. Ventral margin of right paramere with a rounded excavation at the basal portion ( Fig. 1C View Figure 1 ). Dorsal margin of left paramere curved inward from basal to medial portions, medial portion with a short and pointed projection, apex obliquely truncated ( Fig. 1D View Figure 1 ). Ventral margin of left paramere with a bilobate excavation extending along two-third of the paramere margin; apical third obliquely truncated ( Fig. 1D View Figure 1 ). Endophallus : SRP circular, with rounded handle-shaped extension ( Fig. 1G View Figure 1 ). FLP short ( Fig. 1F View Figure 1 , left), comma-shaped, with three sets of bristles ( Fig. 1E View Figure 1 ) right beside it. A+SA with two superposed and elongate sclerites ( Fig. 1F View Figure 1 , right).
Etymology.
Named in honor of the late James S. Ashe, collector of most of the known specimens.
Habitat.
Amazon rainforest. Known from Peru ( Fig. 5C View Figure 5 ). Endemism areas: Brazilian sub-region: South Brazilian dominion: Rondônia province (see Morrone 2014; fig. 12).
Remarks.
According to aedeagus characters, S. ashei sp. nov. ( Fig. 1C, D View Figure 1 ) is closely related to S. federicoescobari ( Fig. 3F View Figure 3 ), S. martinezi ( Fig. 3I View Figure 3 ), S. papaxibe ( Fig. 3J View Figure 3 ), S. pygidialis ( Fig. 3O View Figure 3 ), and S. uniplagiatus ( Fig. 3P View Figure 3 ) by having the parameres strongly asymmetric, with different shape and length (dorsal margin of left paramere with projection; ventral margin of left paramere with bilobate excavation; ventral margin of right paramere with rounded excavation), and FLP sclerite short ( Fig. 1F View Figure 1 , left), with three sets of bristles right beside it ( Fig. 1E View Figure 1 ).
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