Chaetocnema (Chaetocnema) constricta 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 : 38-41

6. Chaetocnema (Chaetocnema) constricta Ruan, Konstantinov & Yang, 2014

( Figs. 24 , 25 )

Chaetocnema (Chaetocnema) constricta Ruan, Konstantinov and Yang, 2014: 24 . TL: China, Fujian. TD: IZCAS.

Distribution: China (Jiangsu, Anhui, Zhejiang, Jiangxi, Fujian, Guangxi, Sichuan, Chongqing, Guizhou, Yunnan); South Korea, South Japan, India.

Host plants: Rubus corchorifolius Linn. f. (Ruan et al., 2014), R. fruticosus Linn. (Ruan et al., 2014) (Rosaceae) , Polygonum sp. ( Polygonaceae ) (Ruan et al., 2014).

Description: Body rather narrow. Male body length: 1.71–1.80 mm. Female body length: 2.14–2.30 mm. Male body width: 0.89–0.93 mm. Ratio of length of antenna to length of body: 0.61–0.62. Ratio of elytron length (along suture) to width (maximum): 1.45±0.05. Ratio of pronotum width (at base) to length: 1.44±0.05. Ratio of length of elytron to length of pronotum (along middle): 2.55±0.05. Ratio of width of elytra at base to width of pronotum at base (in middle of humeral calli): 1.12±0.05. Ratio of maximum width of elytra to maximum width of pronotum: 1.37±0.05.

Elytra, pronotum and head bronzy. Antennomere 1 partially dark brown, 2–4 yellow, 5–6 yellow with brown apex. Remaining antennomeres brown with yellow at base. Pro- and mesofemora brown with apex yellow. Metafemora brown. Tibia mostly yellow, dark at distal half. Tarsi yellow.

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 slightly concave. Orbital sulcus (above antennal socket) very deep. Ratio of width of frontal ridge to width of antennal socket: 0.70–0.75. Surface of vertex sparsely and unevenly covered with 5–6 punctures on each side near eye. Number of punctures on orbit on each side: 1–2. Number of setae along frontolateral sulcus on each side: 9–10. Number of setae on frons (triangular area surrounded by frontolateral sulci and clypeus): 0. Number of setae on clypeus: about 4. Number of setae on labrum: 6. Anterior margin of labrum slightly concave in middle.

Pronotum with two short longitudinal impressions visible only near basal margin. Row of deep large punctures near basal margin, present laterally absent in middle. Pronotal base evenly convex. Anterolateral prothoracic callosity forms moderately developed obtuse angle protruding anterolaterally. Posterolateral prothoracic callosity projects beyond lateral margin of pronotum. Diameter of pronotal punctures subequal to distance between adjacent punctures.

Elytra with convex lateral sides. Scutellar row of punctures regular, single. Remaining rows regular. Humeral calli well developed. Interspaces of rows of punctures smooth and glabrous. Two rows of minute punctures present on each interspace.

First male protarsomere slightly larger than second. First male protarsomere, length to width ratio: 1.90–2.00. First and second male protarsomeres, length to length ratio: 1.60–1.80, width to width ratio: 1.05–1.13. First male protarsomere, ratio of width at apex to width at base: 1.70–1.88. Large lateral denticle on metatibia sharp. Metatibial serration present, obtuse. First male metatarsomere, length to width ratio: 1.86–1.91. First and second male metatarsomeres, length to length ratio: 1.91–1.93, width to width ratio: 0.95–1.07. Third and fourth male metatarsomeres, length to length ratio: 0.59–0.76. Ratio of metatibia length to metafemora length: 0.82±0.05. Ratio of length of hind leg to length of body: 0.91±0.05.

Aedeagus parallel-sided in distal third, apex in ventral view narrowed abruptly and forms a cap. Ventral longitudinal groove of aedeagus poorly developed, narrowed beyond middle, widened towards apex, apically as wide as basally. Apical denticle of aedeagus absent in ventral view. Minute transverse wrinkles on ventral side of aedeagus absent. Aedeagus in lateral view sinusoidal near apex. Maximun curvature of aedeagus in lateral view situated medially. Aedeagus thickened in lateral view. Ratio of width (in middle) to length of aedeagus in ventral view: 0.17.

Spermathecal receptacle cylindrical. Spermathecal duct straight. Spermathecal pump much shorter than receptacle, with cylindrical apex. Basal part of receptacle about as wide as middle and apical parts separately. Posterior sclerotization of tignum spoon-shaped, wider than middle part. Apex of vaginal palpus subtriangular, with lateral margin convex. Vaginal palpus slightly narrowing from base till middle and thence slightly widening towards apex. Anterior sclerotization of vaginal palpus slightly narrowing anteriorly. Anterior end of anterior sclerotization narrowly rounded. Posterior sclerotization longer than wide. Posterior sclerotization about as wide as anterior.

Remarks: Chaetocnema constricta may be differentiated from C. picipes , C. granulosa and C. cheni by the following characters: first male protarsomere only slightly larger than second, appendages light in color, anterolateral angles of pronotum obtuse and thickened. Exteriorly this species resembles C. kingpinensis . But C. kingpinensis is larger in body size, having relatively longer appendages and pronotum. Under soft light, C. constricta ’s is entirely bronzy, while C. kingpinensis has usually bronzy pronotum and black brown elytra.

Types (in IZCAS, except a few paratypes were transferred to USNM and BMNH): 1♂ (Holotype), China, Shuyang, Fujian, alt. 200m, 2013.VIII.12, leg. Yongying Ruan; 30♀ 20♂ (Paratypes), China, Huangshan , Anhui, alt. 630m, 18.VIII.1978 , leg. Shuyong Wang; 6♀ 7♂ (Paratypes), China, Shaping , Sichuan, 29.XI ; 6♀ 6♂ (Paratypes), China, Ebian , Sichuan, X ; 1♀ (Paratype), China, Beibei , Chongqing, 11.VI.1940 ; 6♀ 3♂ (Paratypes), China, Huaxi Guizhou, 8.VI.1980 ; 6♀ 1♂ (Paratypes), China, Sanmuping, Tianmu Mountain , Zhejiang, 30.VII.1998 , leg. Hong Wu; 2♂ 4♀ (Paratypes), China, Tianmu Mountain , Zhejiang, 6.VI.1999 , leg. Mingyuan Gao; 3♀ 1♂ (Para- types), China, Longwang Mountain, Anji , Zhejiang, 1995–1996 , leg. Hong Wu; 1♂ (Paratype), China, Nanjing , Jiangsu, 1994 , leg. Miao Hu; 20♀ 8♂ (Paratypes), China, Jiulianshan , Jiangxi, 20–23.IX.1978 , leg. Peiyu Yu, feed on Rubus sp.; 1♂ 2♀ (Paratypes), China, Dazhulan , Fujian, 15–20.VI.1948 ; 5♀ (Paratypes), China, Wuyi Mountain , Fujian, alt. 500–1100m, V.1997 , leg. Jiashe Wang; 1♀ (Paratype), China, Wuyi Mountain , Fujian, alt. 1200m, 1997. VII , leg. Jiashe Wang; 83♀ 30♂ (Paratypes), Wuyi Mountain , Fujian, 5–26.V.1997 , leg. Jiashe Wang; 1♀ 2♂ (Para- types), China, Nanping , Fujian, 22.VII.1957 leg.; 1♂ (Paratype), China, Aotou, Huangkeng, Jianyang , Fujian, alt. 750–950m, 3.VI.1997 , leg. Yong Zuo; 1♀ (Paratype), China, Longling , Yunnan, alt. 1600m, 20.V.1995 , leg. Zifeng Xue; 1♂ (Paratype), China, Fangcheng , Guangxi, alt. 650m, 14.III.1998 , leg. Gexia Qiao; 10♀ 8♂ (Paratypes), China, Jinxiu , Guangxi, alt. 600m, V.1999 , leg. Mingyuan Gao; 5♀ 2♂ (Paratypes), China, Yanshan, Guilin , Guangxi, 15.VI.1963 . leg. Shuyong Wang; 1♂ (Paratype), China, Tianping Mountain, Longsheng , Guangxi, 9.VI.1963 . leg. Shuyong Wang; 17♀ 10♂ (Paratypes), China, Yaoshan, Xiuren , Guangxi, 1938.V.6.

Additional specimens: 1♂ ( BMNH), Doherty , India, Fry coll. 1905.100, Chaetocnema constricta Ruan et al, 2014, det. Yongying Ruan , 2016; 2♂ 4♀ ( IZCAS), Korea, GN Prov., Mt., Jiri, Sancheong City , Sicheonmyeon, Sincheonri, 17.V.2000 B. Korotyaev. Chaetocnema sp. det. A.S.Konstantinov , 2003, Chaetocnema constricta det. Ruan. 1♂ ( USNM), Japan, Ryukyu IS., Ishigaki I, Kara–Yama , 18.III.1964 .

Figures

FIGURE 24. Chaetocnema constricta on foliage of its host plant, Rubus simplex. Photographed by Ruan Y.,13.VI. 2017., Fu-an, Fujian Province.

FIGURE 25. Chaetocnema constricta. A Holotype, habitus. B Prothorax. C Head. D Aedeagus, ventral and lateral views. E Apex of Aedeagus, dorsal view. F Vaginal palpi. G Spermatheca. H Tignum.