Chilocorus toulakhomianus Li & Wang, 2021

Li, Wenjing, Chen, Bingxu, Toulakhom, Chantharath & Wang, Xingmin, 2021, Two new species of Chilocorus Leach, 1815 from Laos (Coleoptera Coccinellidae Chilocorini), Biodiversity Data Journal 9, pp. 72966-72966 : 72966

Chilocorus toulakhomianus Li & Wang sp. n.

Materials

Type status: Holotype. Occurrence: recordNumber: No. 202107-01; recordedBy: Wenjing Li; individualCount: 1; sex: 1 male; lifeStage: adult; previousIdentifications: Chilocorus politus; Taxon: scientificName: Chilocorus toulakhomianus Li & Wang, sp. n.; Location: country: Laos; locality: Itou, Pakxong ; georeferenceProtocol: label; Identification: identifiedBy: Wenjing Li; dateIdentified: 2021; Event: samplingProtocol: sweeping; eventDate: 06/12/ 2006 Type status: Paratype. Occurrence: recordedBy: Wenjing Li; individualCount: 19; sex: 13 male, 6 female; lifeStage: adult; previousIdentifications: Chilocorus politus; Taxon: scientificName: Chilocorus toulakhomianus Li & Wang, sp. n.; Location: country: Laos; locality: Itou, Pakxong ; georeferenceProtocol: label; Identification: identifiedBy: Wenjing Li; dateIdentified: 2021; Event: samplingProtocol: sweeping; eventDate: 06/12/ 2006 Type status: Paratype. Occurrence: recordedBy: Wenjing Li; individualCount: 4; sex: 3 male, 1 female; lifeStage: adult; previousIdentifications: Chilocorus politus; Taxon: scientificName: Chilocorus toulakhomianus Li & Wang, sp. n.; Location: country: Laos; locality: Seleuy, Xam Nua ; georeferenceProtocol: label; Identification: identifiedBy: Wenjing Li; dateIdentified: 2021; Event: samplingProtocol: sweeping; eventDate: 06/09/2007

Description

TL: 4.80-6.00 mm, TW: 4.45-5.28 mm, TH: 2.88-3.32 mm, TL/TW: 1.08-1.14, PL/PW: 0.57-0.61, EL/EW: 0.97-0.99.

Body roundish, strongly convex. Head, mouthparts and antenna brownish-red, sparsely covered with short, greyish pubescence. Pronotum, scutellum and elytra glabrous, brownish-red (Fig. 1 a-c). Underside brownish-yellow, sparsely covered with short, greyish pubescence.

Head relatively large, 0.52-0.54 times pronotal width, punctures on frons large and densely distributed, 0.5-1.5 diameters apart, surface polished between punctures. Eyes approximately oval, densely faceted, interocular distance 0.45 × as wide as head (Fig. 1 c). Pronotum 0.50-0.52 × as wide as elytra, pronotal punctures moderately large and moderately densely distributed, smaller than those on head, 1.5-3.0 diameters apart, surface polished between punctures. Punctures on elytra moderately large and sparsely distributed, 2.0-3.5 diameters apart, similar to those on pronotum. Prosternal process moderately broad, slightly expanded to apex. Abdominal postcoxal lines incomplete, reaching posterior margin of abdominal ventrite 1 and running along posterior margin, then almost reaching lateral margin. Posterior margin of male abdominal ventrite 5 broadly rounded and ventrite 6 slightly emarginate medially (Fig. 1 l).

Male genitalia: penis slender, penis capsule with long outer and short inner arm, with spiral texture from apical 1/5 to apical 1/3, apex of penis truncate with membranous appendage (Fig. 1 m-n). Tegmen stout, penis guide slightly narrow at base, gradually broadened up to basal 1/2, abruptly tapering from apical 1/4 to apex, slightly asymmetrical in ventral view; penis guide in lateral view, widest at base, gradually converging to apex; parameres nearly as long as the penis guide with dense short setae on the inner sides and distal end with a group of short setae in lateral view (Fig. 1 o-p).

Female genitalia: coxites elongate, subtriangular, outer and inner margins almost straight, tapering to blunt apices (Fig. 1 q).

Diagnosis

This species is very similar to C. politus and species C. vientianicus , sp. n. in the body size and colouration, but can be distinguished from them by penis with spiral texture from apical 1/5 to apical 1/3; penis guide widest at base, gradually converging to apex in lateral view. Furthermore, this species also can be distinguished from C. vientianicus , sp. n. by coxites with straight outer and inner margins. In C. vientianicus , sp. n., coxites outer margin is almost straight, but inner margin is distinctly concave near apical 1/3.

Etymology

The specific epithet is named after Toulakhom, the type specimen collector of this ladybird.

Distribution

Laos (Pakxong, Xam Nua) (Fig. 3 ).

Figures

Figure 1. Chilocorus toulakhomianus Li & Wang, sp. n. a dorsal view; b lateral view; c frontal view; d prothorax; e antenna; f maxilla; g mandible; h labium; i front leg; j hind leg; k tarsal claw; l abdomen; m penis; n apex of penis; o tegmen, lateral view; p tegmen, ventral view; q ovipositor. Scale bars: 0.1 mm.

Figure 3. Distribution map. (■) Chilocorus toulakhomianus Li & Wang, sp. n. (★) Chilocorus vientianicus Li & Wang, sp. n.