Chaetocnema (Chaetocnema) baoshanica Ruan, Konstantinov & Yang, 2019

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 : 29-30

3. Chaetocnema (Chaetocnema) baoshanica Ruan, Konstantinov & Yang , New Species

( Fig. 18 )

Etymology: This species is named after the type locality. Specific epithet is a noun in apposition.

Diagnosis: Chaetocnema baoshanica sp. nov. is endemic to China. It is characteristic in having very weak humeral calli and complete but fragile hind wings. This species is close to C. kingpinensis , however, differs from the latter by the absence of apical denticle of aedeagus (present and small in C. kingpinensis ) and dark appendages (antennae and legs yellow to brown in C. kingpinensis ).

Distribution: China (Yunnan).

Host plants: Unknown.

Description: Body narrow, legs and antennae robust and long. Body length: 2.00– 2.35 mm, body width: 0.90– 1.05. Ratio of length of antenna to length of body: 0.68-0.70. Ratio of elytron length (along suture) to width (maximum): 2.40–2.50. Ratio of pronotum width (at base) to length: 1.30-1.35. Ratio of length of elytron to length of pronotum (along middle): 1.85-1.95. Ratio of width of elytra at base to width of pronotum at base (in middle of humeral calli): 1.00-1.05.

Dorsum strongly bronze colored. Pronotum and head strongly reticulate. Antennomeres 1-7 yellow brown, with 5 and 6 darker. Antennomeres 8–11 brown. Tibiae and tarsi yellow brown. Pro- and mesofemora dark brown. Metafemora dark brown to black, with slight metallic luster.

Head hypognathous, slightly produced forward. Frontal ridge between antennal sockets narrow, long and convex. Frontolateral sulcus present. Suprafrontal sulcus shallow, faint. Orbital sulcus and supra-antennal sulcus not deep. Ratio of width of frontal ridge to width of antennal socket: 0.80–0.90. Surface of vertex sparsely and shallowly covered with 5–6 punctures close to each eye. Number of punctures on orbit on each side: 3–4. Number of punctures along frontolateral sulcus on each side: 5-6. Number of punctures on frons (triangular area surrounded by frontolateral sulcus and clypeus): 0. Number of setae on clypeus: about 10. Number of setae on labrum: 6. Anterior margin of labrum slightly convex in middle.

Pronotum with two short longitudinal impressions visible only near basal margin. Deep row of large punctures at base of pronotum absent or obscurely present on sides. Pronotal base convex. Lateral margins of pronotum very slightly convex. Anterolateral prothoracic callosity protruding antero-laterally, forms strong obtuse angle. Posterolateral prothoracic callosity poorly developed. Wrinkles forming strongly reticulated patterns on the interspace of punctures of pronotum. Diameter of pronotal punctures subequal to distance between them.

Elytra with convex sides. Punctures on elytra arranged in regular rows, including one peri-scutellar row. Elytral humeral calli poorly developed, almost absent. Interspaces between rows of punctures on elytra densely covered with minute punctures. Number of minute puncture lines on each interspace: 2.

First male protarsomere only slightly larger than second. Large lateral denticle on metatibia sharp. Dorsal side of metatibia serrated.

Aedeagus parallel-sided, apex in ventral view narrowed abruptly. Ventral longitudinal groove of aedeagus poorly developed, apically as wide as basally. Apical denticle of aedeagus in ventral view poorly differentiated, in lateral view absent. Minute transverse wrinkles absent on ventral side of aedeagus. Distal half of aedeagus in lateral view slightly sinusoidal. Aedeagus narrow in lateral view.

Spermathecal receptacle pear-shaped, slightly narrow in middle. Spermathecal duct gently curved, not distorted. Spermathecal pump much shorter than receptacle. Apex of spermathecal pump cylindrical. Maximum width of receptacle situated basally. Receptacle basally wider than apically. Apex of vaginal palpus subtriangular, with convex lateral side. Vaginal palpus gently narrowing from base till middle, thence slightly widening towards apex. Anterior sclerotization of vaginal palpus slightly narrowing anteriorly. Anterior sclerotization of vaginal palpus 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.

Type: Holotype: ♂ ( USNM): 1) China, Yunnan, 60 km W Baoshan, Gaolingong Shan , 14.VI.2012, N25.18 W98.47, h– 1557m, WP–344, leg. A. Konstantinov. 2 ) Holotype Chaetocnema baoshanica sp. nov., Des. Ruan Yong Ying, 2016.

Paratypes: 1♂ ( IZCAS): 1) China, Yunnan, 60 km W Baoshan, Gaolingong Shan , 14.VI.2012, N25.18 W98.47, h– 1557m, WP–344, leg. A. Konstantinov ; 2) Paratype; 3) Paratypes Chaetocnema baoshanica sp. nov., Des. Ruan et al. 2017. 3♀ 2♂ ( IZCAS): 1) China, Menghun, Menghai, Xishuangbanna , Yunnan; 2) alt. 1200–1400m, 20.V.1958, Leg. Chunpei Hong; 3) Paratype; 4) Paratypes Chaetocnema baoshanica sp. nov., Des. Ruan et al. 2017 .

Figures

FIGURE 18. Chaetocnema baoshanica sp. nov. A Holotype, dorsal view. B Head, frontal view. C Pronotum and peri-scutellar area. D1–D2 Aedeagus, ventral view. E1–E2 Aedeagus, lateral view. F Apex aedeagus, ventral view. G Vaginal palpi. H Spermatheca. I Pygidium (tergite 7) of female.