Chaetocnema (Chaetocnema) kingpinensis Ruan, Konstantinov & Yang, 2014

Ruan, Yongying, Yang, Xingke, Konstantinov, Alexander S., Prathapan, Kaniyarikkal D. & Zhang, Mengna, 2019, Revision of the Oriental Chaetocnema species (Coleoptera, Chrysomelidae, Galerucinae, Alticini), Zootaxa 4699 (1), pp. 1-206 : 69-71

21. Chaetocnema (Chaetocnema) kingpinensis Ruan, Konstantinov & Yang, 2014

( Fig. 43 )

Chaetocnema (Chaetocnema) kingpinensis Ruan, Konstantinov & Yang, 2014: 27 . TL: China, Yunnan. TD: IZCAS. Chaetocnema (Chaetocnema) kingpinensis Chen (MS), ( Wang, 1992, In: SH Chen (ed.), Insects of the Hengduan Mountains Region, 1: 681. Manuscript species, species name is mentioned without description or designation of types).

Distribution: China (Jiangxi, Guangxi, Yunnan).

Host plants: Rubus sp.

Description: Body narrow. Male body length: 1.80–2.50 mm, female body length: 2.1 0–2.63 mm. Male body width: 0.88–1.04. Ratio of length of antenna to length of body: about 0.70. Ratio of elytron length (along suture) to width (maximum): 2.55-2.60. Ratio of pronotum width (at base) to length: about 1.32. Ratio of length of elytron to length of pronotum (along middle): about 1.90. Ratio of width of elytra at base to width of pronotum at base (in middle of humeral calli): about 1.14. Ratio of maximum width of elytra to maximum width of pronotum: 1.44–1.46.

Color of elytra usually differ from that of pronotum. Elytra often brown to black, sometimes bronzy. Pronotum bronzy. Head dorsally dark bronzy. Antennomere 1 yellow but darker than antennomeres 2–5. Antennomeres 2–5 yellow, 6–7 partially brown, 8–11 brown with yellow proximally. Tibiae yellow, tarsomeres yellow with claw segment brown at apex. Pro- and mesofemora light brown with yellow apex. Metafemora brown.

Head hypognathous. Frontal ridge between antennal sockets narrow and convex. Frontolateral sulcus present. Suprafrontal sulcus shallow and faint or deep laterally, shallow in middle. Suprafrontal sulcus retuse. Orbital sulcus (above antennal socket) deep. Ratio of width of frontal ridge to width of antennal socket: 0.84–0.88. Vertex sparsely and unevenly covered with 5–6 punctures close to each eye. Number of punctures on orbit on each side: 3–5. Number of setae along frontolateral sulcus on each side: 8–10. Number of punctures on frons (triangular area surrounded by frontolateral sulcus and clypeus): 0. Number of setae on clypeus: 7. Number of setae on labrum: 6. Anterior margin of labrum slightly concave in middle.

Base of pronotum with two short longitudinal impressions. Deep row of large punctures at base of pronotum present only laterally, absent in middle. Pronotal base evenly convex. Lateral sides of pronotum thickened, lateral margin slightly convex with maximum width near base. Pronotum quite convex from lateral view.Anterolateral prothoracic callosity protruding antero-laterally, forms strong obtuse angle. Posterolateral prothoracic callosity projects beyond lateral margin of pronotum. Setae on each callosity long, exceeding half of pronotal length. Wrinkles between punctures on pronotum well developed. Diameter of pronotal punctures subequal to distance between them.

Elytra with convex lateral sides. Elytral punctures arranged in regular rows, including single peri-scutellar row. Humeral calli well developed. Interspaces between rows of punctures on elytra smooth and glabrous. Number of minute puncture rows on each interspace: 2.

First male protarsomere only slightly larger than second. First male protarsomere, length to width ratio: 1.95– 2.03. First and second male protarsomeres, length to length ratio: 1.43–1.52, width to width ratio: 0.89–0.91. First male protarsomere, width at apex to width at base ratio: 1.45–1.55. Large lateral denticle on metatibia sharp. First male metatarsomere, length to width ratio: 2.78–2.85. First and second male metatarsomeres, length to length ratio: 1.80–1.90, width to width ratio: 0.92–0.95. Length of hind leg to length of body ratio about: 1.04.

Apical third of aedeagus parallel-sided. Apex of aedeagus in ventral view narrowing abruptly. Ventral longitudinal groove of aedeagus poorly developed in apical and basal part, narrow or absent in middle part. Longitudinal groove apically as wide as basally. Apical denticle of aedeagus in ventral view poorly differentiated. Apical denticle of aedeagus in lateral view strongly curved ventrally. Minute transverse wrinkles absent on ventral side of aedeagus. Aedeagus in lateral view slightly sinusoidal near apex. Maximum curvature of aedeagus in lateral view situated medially. Ratio of width (in middle) to length of aedeagus (in ventral view) about: 0.18. Aedeagus narrow in lateral view.

Spermathecal receptacle oblong, slightly narrowed in middle. Basal part of spermathecal duct straight. Spermathecal pump much shorter than receptacle, apex cylindrical. Maximum width of receptacle situated basally. Basal part of receptacle wider than apical. Posterior sclerotization of tignum spoon-shaped, wider than mid-section. Midsection of tignum nearly straight. Anterior sclerotization of tignum wider than mid-section. Apex of vaginal palpus subtriangular, with lateral margin gently convex. Vaginal palpus narrowing from base till middle, thence slightly widening towards apex. Anterior sclerotization of vaginal palpus slightly narrowing anteriorly, slightly and evenly curved along length. Anterior end of anterior sclerotization broadly rounded. Posterior sclerotization longer than wide. Posterior sclerotization about as wide as anterior sclerotization.

Types (all in IZCAS): ♂ (Holotype), China, Lushui, Yunnan, alt. 1900m, 8.VI.1981, leg. Shuyong Wang, feed on Rubus sp.; 2♀ 1♂ (Paratypes), China, Jiulianshan national reserve, Jiangxi, 8.IX.1978, leg. Youjiao Liu ; 16♀ 11♂ (Paratypes), China, Lushui , Yunnan, alt. 1900m, 8.VI.1981, leg. Shuyong Wang , feed on Rubus sp.; 8♀ 4♂ (Paratypes), China, Changpotou, Jinping , Yunnan, 22.V.1952, leg. Keren Huang et al., feed on Rubus sp.; 1♂ (Para- type), China, Hetouzhai, Jinping , Yunnan, alt. 2000m, 22.V.1952, leg. Keren Huang et al.; 1♂ (Paratype), China, Baoshan , Yunnan, alt. 1600m, 13.V.1955 , leg. Bu–xi–ke & Le Wu.; 2♂ (Paratypes), China, Menghun, Menghai, Xishuangbanna , Yunnan, alt. 1200–1400m, 20–23.V.1958 ; 1♂ (Paratype), China, Tiantanshan, Jinxiu , Guangxi, alt. 600m, 11.V.1999, leg. Mingyuan Gao ; 4♀ 4♂ (Paratypes), China, Tianping Mountain, Longsheng , Guangxi, 9.VI.1963. leg. Shuyong Wang ; 1♂ (Paratype), China, Tianping Mountain, Longsheng , Guangxi, 740m, feed on Rubus sp . 4♀ 4♂ (Paratypes), China, Tianping Mountain, Longsheng , Guangxi, 9.VI.1963. leg. Shuyong Wang ; 1♂ (Paratype), China, Tianping Mountain, Longsheng , Guangxi, 740m, feed on Rubus sp .

Material: 2♀ ( USNM), China, Yunnan, 60 km W Baoshan, nr. Pumanshao , 3.VI.2012, N24.55 E98.47, Alt. 1925m, WP-343, leg. A. Konstantinov.

Remarks: Chaetocnema kingpinensis can be differentiated from C. picipes , C. granulosa and C. cheni by the following characters: first male protarsomere only slightly larger than second, antennae and legs lighter in color, anterolateral angles of pronotum obtuse and thickened and the unique shape of aedeagus. It also resembles C. constricta , however, C. kingpinensis is larger, with longer appendages and pronotum relatively longer compared to body length. Viewed under white light, elytra of C. constricta is entirely bronzy, while it is usually blackish brown without distinct metallic luster in C. kingpinensis .

Specimens collected from Tianping Mountain are extremely large. The largest specimen of male (from Guanxi, China) is 2.54 mm long, and some female specimens are upto 2.65 mm. The anterolateral calli of pronotum are strongly developed in rare cases.

This species was originally determined as new by SH Chen. The species name also appeared in Chinese in the book “Insects of the Hengduan Mountains Region ” by SH Chen. However, the name remained unavailable till 2014, when it was formally described by Ruan et al.

Figures

FIGURE 43. Chaetocnema kingpinensis. A Holotype, habitus. B Pronotum. C Head, frontal view. D Aedeagus, ventral and lateral views. E Apex of Aedeagus, dorsal view. F Vaginal palpi. G Spermatheca. H Tignum.