Scybalocanthon pinopterus ( Kirsch, 1873 )

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 : 330-331

Scybalocanthon pinopterus ( Kirsch, 1873)

( Figs. 2A , 4S , 5R , 6E )

Canthon pinopterus Kirsch, 1873: 340 ; Gillet 1911: 32 (catalog); Schmidt 1922: 65, 78 (diagnosis); Balthasar 1939: 192 (rede- scription); Balthasar 1941: 341 (catalog); Balthasar 1951: 326 (catalog); Vulcano & Pereira 1964: 625 (catalog); Krajcik 2006: 29 (catalog); Krajcik 2012: 64 (catalog).

Canthon pinopterum: Blackwelder 1944: 200 (checklist).

Scybalocanthon pinopterum : Vaz-de-Mello 2000: 194 (checklist).

Scybalocanthon pinopterus: Halffter & Martínez 1977: 67 (species list); Ratcliffe et al. 2015: 196 (cited for Peru).

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

Description. Body. Oval, lateral edges rounded. Surface opaque, completely microgranulate. Color. Pronotum, lateral portion of hypomera, metaepisternae, metaventrite, abdominal ventrites, pygidium, and middle of femora yellow or light brown. Head, elytra, prosternum, mesoventrite, mesoepisternae, trochanters, proximal and distal portions of femora, and tibiae dark brown or black. Length. 9.4–9.8 mm. Thorax. Anterior angles of pronotum approximately 95°. Lateral margin strongly curved outward. Elytra. Striae thin and shiny, punctures inconspicuous. Eighth stria with a thin carina at the anterior portion. Aedeagus. Parameres symmetrical, obliquely truncate apically ( Fig. 4S ). Dorsal margin of parameres curved inward from the basal to medial portions, and curved outward at the apical portion. 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. 5R ). FLP elliptical, with three sets of bristles and microbristles right beside it ( Fig. 5R ). A+SA with two superposed and elongate sclerites ( Fig. 5R ).

Type material. Canthon pinopterus Kirsch , lectotype ♀ (here designated; SMTD): “ Paruru [Paruro, Peru] / m. Kirsh” // “Typus” // “ LECTOTYPE ♀ / Canthon / pinopterus / Kirsch / des. F. Z. Vaz-de-Mello ” .

Non-type material [ 17 males, 7 females]. PERU: HUÁNUCO: Tingo Maria , 8.vii.1989, [no collector]— 1♂ ( CEMT) ; MADRE DE DIOS, Cocha Salvador, Parque Nacional del Manú , 310 m (12°0’13’’S, 71°31’36’’W), 20–21.x.2000, R. Brooks, flight interception trap (2000-70)— 5♂ 1♀ ( CMNC) ; Cocha Salvador, Parque Nacional del Manú , 310 m (11°53’45”S, 71°24’24”W), 17–19.x.2000, flight interception trap, R. Brooks— 1♂ ( CEMT) . Estación Biológica Cocha Cashu, Parque Nacional de Manú , 380 m (11°53’45’’S, 71°24’24’’W), 17–19.x.2000, R. Brooks, flight interception trap (2000-42)— 10♂ 6♀ ( CMNC, MZUFPA) .

Distribution. Known from Peru ( Fig. 6E ). Endemism areas: Brazilian sub-region: South Brazilian dominion: Rondônia and Yungas provinces (see Morrone 2014; fig. 12).

Remarks. We found just one type specimen of Canthon pinopterus in the collections studied. Analyzing the original description ( Kirsch 1873), no holotype was originally fixed, and we could not find any explicit mention that Canthon pinopterus was described based on a single specimen. Following the International Commission on Zoological Nomenclature (1999) Recommendation 73F, we assume the type series was based on two or more individuals. Therefore, we designate here a lectotype rather than assume that the specimen we found is the holotype.

Figures

FIGURE 1. Species of Scybalocanthon, dorsal habitus. A, Scybalocanthon acrianus new species; B, S. adisi new species; C, S. aereus; D, S. arnaudi new species; E, S. batesi; F, S. chamorroi new species; G, S. cyanocephalus; H, S. darlingtoni; I, S. federicoescobari new species; J, S. haroldi new species; K, S. kaestneri; L, S. kelleri; M, S. korasakiae; N–O, S. maculatus; P, S. martinezi new species; Q–R; S. moniliatus; S. S. nigriceps; T. S. papaxibe new species. Scale bar: 2 mm.

FIGURE 2. Species of Scybalocanthon, dorsal habitus. A, Scybalocanthon pinopterus; B, S. pygidialis; C–G, S. sexpilotus; H–J, S. trimaculatus; K, S. uniplagiatus. Scale bar: 2 mm.

FIGURE 3. Details of the external morphology in Scybalocanthon. A, Elytral surface in S. chamorroi new species; B, elytral surface in S. acrianus new species; C, pygidium in S. sexpilotus; D, detail of the eighth elytral stria in S. pygidialis (carina point- ed); E, mesofemur in S. kaestneri; F, mesofemur in S. nigriceps; G, mesotarsus in S. moniliatus; H, metatarsus in S. moniliatus; I, mesotibia in S. aereus; J, mesotibia of Canthon arcabuquensis.

FIGURE 4. Aedeagus, detail of parameres in left and right view. A, Scybalocanthon acrianus new species; B, S. adisi new species; C, S. aereus; D, S. aereus (lectotype); E, S. arnaudi new species; F, S. chamorroi new species; G, S. cyanocephalus; H, S. darlingtoni; I, S. federicoescobari new species; J, S. haroldi new species; K, S. kaestneri; L, S. kelleri; M, S. korasakiae; N, S. maculatus; O, S. martinezi new species; P, S. moniliatus; Q, S. nigriceps; R, S. papaxibe new species; S, S. pinopterus; T, S. pygidialis; U, S. sexspilotus; V, S. trimaculatus; W, S. uniplagiatus. Scale bar: 0.5 mm.

FIGURE 5. Sclerites of endophallus. Superior right peripheral (SRP) sclerite. Fronto-lateral peripheral (FLP) sclerite. Complex of axial and subaxial (A+SA) sclerites.Additional sclerite (AS). Set of microbristles (Smb). Set of bristles (Sb). A, Scybalocanthon acrianus new species; B, S. adisi new species; C, S. aereus; D, S. arnaudi new species; E, S. chamorroi new species; F, S. cyanocephalus; G, S. darlingtoni; H, S. federicoescobari new species; I, S. haroldi new species; J. S. kaestneri; K, S. kelleri; L, S. korasakiae; M, S. maculatus; N, S. martinezi new species; O, S. moniliatus; P, S. nigriceps; Q, S. papaxibe new species; R, S. pinopterus; S, S. pygidialis (specimen from Amazonas, Brazil); T, S. pygidialis (specimen from Cayenne, French Guiana); U, S. sexspilotus; V, S. trimaculatus; W, S. uniplagiatus. Scale bar: 0.5 mm.

FIGURE 6. Known distribution of species of Scybalocanthon.