Chilocorus nigricaeruleus Li & Wang, 2018

Li, Wenjing, Huo, Lizhi, Wang, Di, Ahrens, Dirk & Wang, Xingmin, 2018, Contribution to the genus Chilocorus Leach, 1815 (Coleoptera: Coccinellidae: Chilocorini), with descriptions of two new species from China, European Journal of Taxonomy 469, pp. 1-34 : 7

Chilocorus nigricaeruleus Li & Wang sp. nov.

urn:lsid:zoobank.org:act:AD963BB9-B700-4984-BE32-C9AFAFFE15D1

Figs 3 , 21

Diagnosis

This species resembles Chilocorus melas Weise, 1898 , but can be distinguished from it by having relatively large black body with dorsum with bluish lustre ( Fig. 3a ) and equal length of penis guide and parameres ( Fig. 3o ). In C. melas , the body is relatively small, dorsum black ( Fig. 5a ) and the penis guide distinctly longer than parameres ( Fig. 5g ).

Etymology

The specific epithet is derived from the Latin and refers to the colour of the elytra and pronotum, black with a bluish lustre.

Type material

Holotype

CHINA: Ƌ, Yunnan Prov., Longtan, Ximeng , 900 m a.s.l., 9–10 May 2008, X.M. Wang leg. ( SCAU (E) 11287).

Paratypes

CHINA: 1 Ƌ, same collection data as for holotype ( SCAU (E) 11288).

Description (male)

MEASUREMENTS. TL: 4.40–4.67 mm, TW: 4.00– 4.33 mm, TH: 2.33–2.40 mm, TL/TW: 1.08–1.10, PL/ PW: 0.48–0.51, EL/EW: 0.98–0.99.

BODY. Roundish, strongly convex. Head, antenna and mouthparts yellow, sparsely covered with short, greyish pubescence. Pronotum black with bluish lustre, except anterior angles yellow. Scutellum and elytra black with bluish lustre ( Fig. 3 a–c). Underside yellow except elytral epipleura black, metaventrite brownish yellow, sparsely covered with short, greyish pubescence. Head relatively large, 0.52 × as wide as pronotum, punctures on frons large and densely distributed, 1.0–2.0 diameters apart, surface polished between punctures. Eyes approximately oval, densely faceted, interocular distance 0.41 × as wide as head ( Fig. 3c ). Pronotum 0.51 × as wide as elytra, pronotal punctures moderately large and moderately densely distributed, smaller than those on head, 2.0–3.0 diameters apart, surface polished between punctures. Punctures on elytra moderately large and sparsely distributed, 2.0–4.0 diameters apart, similar to those on pronotum. Prosternal process moderate 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 emarginate medially ( Fig. 3l ).

MALE GENITALIA. Penis slender, penis capsule with long outer and inner arms, apex of penis slightly narrow with membranous appendage ( Fig. 3 m–n). Tegmen stout, penis guide widest at basal ½, then gradually converging to blunt apex, distinctly asymmetrical in ventral view and widest at base, gradually converging to blunt apex, bent outwardly from apical 1/6 to apex in lateral view. Parameres constricted from base to basal ½ than expanded toward apex, as long as penis guide, densely covered with short setae at the inner surfaces and distal end in lateral view ( Fig. 3 o–p).

Distribution

China (Yunnan) ( Fig. 21 ).

Figures

Fig. 3. Chilocorus nigricaeruleus Li & Wang sp. nov., holotype. 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. Scale bars: 0.1 mm. (SCAU (E) 11287)

Fig. 21. Distribution map. () = Chilocorus politus Mulsant, 1850; () = C. yunlongensis Cao & Xiao, 1984; (●) = C. nigricaeruleus Li & Wang sp. nov.; (Ǫ) = C. nigrita (Fabricius, 1798); (▲) = C. melas Weise, 1898; () = C. rubidus Hope, 1831; (■) = C. chinensis Miyatake, 1970; (□) = C. rufitarsis Motschulsky, 1853; () = C. hauseri Weise, 1895; () = C. circumdatus (Gyllenhal, 1808).

Fig. 5. Chilocorus melas Weise, 1898. a. Dorsal view. b. Lateral view. c. Frontal view. d. Abdomen. e. Penis. f. Apex of penis. g. Tegmen, lateral view. h. Tegmen, ventral view. i. ovipositor. Scale bars: 0.1 mm. (SCAU)