Scybalocanthon darlingtoni ( Paulian, 1939 )

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 : 320-321

Scybalocanthon darlingtoni ( Paulian, 1939)

( Figs. 1H , 4H , 5G , 6A )

Canthon darlingtoni Paulian, 1939: 141 , figs. 1–2, 7 (original description); Blackwelder 1944: 199 (checklist); Gacharná 1951: 221 (catalog); Krajcik 2006: 26 (catalog); Krajcik 2012: 63 (catalog).

Scybalocanthon darlingtoni: Martínez 1953: 72 (taxonomic remarks); Pereira & Martínez 1956: 114, 116 (catalog and identification key); Vulcano & Pereira 1964: 637 (catalog); Vulcano & Pereira 1967: 554 (distribution, identification key); Halffter & Martínez 1977: 67 (species list).

Diagnosis. Specimens of S. darlingtoni are readily distinguishable from all other species by the pronotum, femora, and elytra bicolored, with irregular black and yellow spots on the dorsal body surface ( Fig. 1H ); aedeagus with parameres elongate, subrectangular, not excavated ventrally ( Fig. 4H ); and endophallus lacking bristles or microbristles close to the FLP sclerite ( Fig. 5G ).

Description. Body. Oval, lateral edges rounded. Surface completely microgranulate. Color. Body with yellow and black spots on the dorsal and ventral surface, and metallic sheen. Head, parts of pronotum and elytra, internal portion of hypomera, prosternum, mesoventrite, mesoepisternae, metaepisternae, parts of metaventrite, central portion of abdominal ventrites and pygidium, profemora (except the middle of the anterior portion), protibiae, proximal and distal portions of mesofemora and metafemora, and mesotibiae and metatibiae black. Other parts of the pronotum and elytra, lateral portion of hypomera, parts of metaventrite, lateral portion of abdominal ventrites and pygidium, middle of profemora, mesofemora, and metafemora yellow. Length. 6.5–6.8 mm. Thorax. Pronotum with two irregular and complex black spots, fused at their central portions; one anterior spot subtrapezoidal shaped with two lateral projections and four posterior projections; one posterior spot quadrate in shape with two anterior projections. Anterior angles of pronotum acute (approximately 80°). Lateral margin irregularly curved outward, forming an obtuse angle at the middle portion. Elytra. Surface with alternating bands of black and yellow spots. Striae thin and weakly impressed, inconspicuous. Eighth stria lacking carina at the anterior portion. Aedeagus. Parameres slightly asymmetrical, with subrectangular shape, truncate apically ( Fig. 4H ). Dorsal margin of parameres slightly curved inward at the basal portion; from the medial to apical portions substraight. Ventral margin of parameres substraight, with a short denticle at the basal portion. SRP circular, with substraight handle-shaped extension ( Fig. 5G ). FLP Ishaped ( Fig. 5G ). A+SA with two superposed and elongate sclerites ( Fig. 5G ). AS I-shaped ( Fig. 5G ).

Type material. Canthon darlingtoni Paulian , lectotype ♂ (here designated; MNHN): “Sta Marta / Colombia / Darlington” // “coTYPE” // “ Canthon / Darlingtoni / n. sp. ” // “ PARATYPE ” // “ PARALECTOTIPO, SCYBA- LOCANTHON. DARLINGTONI, PAULIAN, G. H. y A. M. DET. 76” // “ LECTOTYPE ♂ / Canthon / darlingtoni / Paulian / des. F. Z. Vaz-de-Mello ” .

Non-type material [ 9 males, 4 females]: COLOMBIA : MAGDALENA, Sierra. Nueva Grande, Sierra Nevada de Santa Marta, 1609 m, 9–27.iv.1975, J.A. Kochalka, pitfall trap— 5♂ 2♀ ( CMNC); same locality but Cerro Kennedy, V. da Minas (73°43’12’’W, 10° 52’00’’N), 2.i.1999, 1670 m, J.A. Noriega— 1♂ 2♀ ( CEMT); Sierra San Lorenzo (Ujhelyi), [anonymous]— 1♂ ( CEMT). Campana [= El Campano], 24 km S Santa Marta, 914 m (11°6’N, 74°5’W), 14.v.1973, Campbell & Howden— 1♂ ( CMNC); Río Frio (10°55’N, 74°10’W), [no date], Darlington— 1♂ ( CMNC) .

Distribution. Known from Colombia ( Fig. 6A ). Endemism areas: Brazilian sub-region: Pacific dominion:

Guajira province (see Morrone 2014; fig. 12).

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 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.