Chlamisus purpureocupreus Chen, 1976

Su, Liang & Zhou, Hong-Zhang, 2017, Taxonomy of the genus Chlamisus Rafinesque (Coleoptera: Chrysomelidae) from China with description of three new species, Zootaxa 4233 (1), pp. 1-138 : 73-75

Chlamisus purpureocupreus Chen, 1976

(Figs 18-1, 18-2; 18-3)

Chen et al., 1976: 217 (type locality: Chayu, Tibet; type deposted: IZ-CAS); Tan & Wang, 1981: 445; Tan, 1987: 41; Tan, 1988: 318.

Material examined. CHINA: Xizang: 1♀, Chayu, Jiazhong , 3200 m, 23. VIII. 1973, coll. Fusheng Huang ; 1♀, Motuo, Gedang , 890–2040 m, 24. IX. 1982, coll. Yinheng Han (IZ-CAS), (male specimen absent).

Measurements. BL = 3 mm, BW = 1.8 mm, HL = 0.75 mm, HW = 0.8 mm, PL = 1.1 mm, PW = 1.65 mm, EL = 2.2 mm, PYL = 0.8 mm, PYW = 0.9 mm, SL = 0.3 mm.

Redescription. Body (Figs 18-1A, 18-2A) small and slender, tubercle tops and ridge topes seemed somehow translucent. Antennae and tarsi covered with short white hairs, head, legs and body ventral side covered with miniature-haired punctures. Body color purplish to reddish bronze, darker on posterior-portion of pronotum and ventral side of the body, redder on humeri and apical part of elytra; scutellum black, bronze in the center.

Head (Figs 18-1D; 18-2C) nearly round, slightly broader than long, finely and densely punctured, puncture intervals slightly raised, slightly depressed along median line of vertex to near occiput, labrum bronze, rectangular, three times as broad as long, eyes black.

Antennae (Figs 18-1I; 18-2E) yellow on basal four segments, brown the remainders. Scape twice as long as broad, pedicel globular, slightly triangular, 3rd short, 4th a little longer than 3rd, 5th slightly dilated, 6–10th flat and broad, serrated, 11th triangular, obtuse at apex.

Pronotum (Fig. 18-1F) finely, deeply and densely punctured; a large tubercle on the lateral portion; disc moderately elevated, with two pairs of oblique ridges opening anteriorly, anterior pair smaller, and a short pair of ridges between them. Scutellum (Fig. 18-1H) broad, almost rectangular, moderately produced anteriorly and posteriorly, posterior-lateral angles moderately extended, apex obtuse. Prosternum (Figs 18-1E; 18-2G) triangular, prosternal process moderately extended, apex obtuse.

Elytra (Fig. 18-2F) rounded apically, lateral sides subparallel; finely and moderately punctured, sparser near apex; suture teeth absent throughout; basal margin from scutellum to median row coarsely rugose, humeri finely rugose; longitudinal ridges weak and indistinct, tubercles sharp but small; sutural row consisting of four tubercles, ridges indistinct before 2nd tubercle, 1st tubercle indistinct, 2nd small, 3rd merging with 3rd tubercle of median row into a transverse one, 4th small and next to suture; median row consisting of four tubercles, 1st situated near basal margin, 2nd merging with 2nd tubercle of humeral row into a transverse tubercle, 4th obsolete, 5th largest, longitudinal; humeral row consisting of two tubercles, 1st obsolete, 3rd longitudinal; lateral row with two tubercles, 1st transverse, 2nd small; a small tubercle at posterior-lateral angle, a large tubercle consisting of several small tubercles above it. Legs (Fig. 18-1J) partially purplish to reddish bronze, tarsi yellow.

Abdomen (Fig. 18-1G) finely and densely punctured. 1st visible abdominal segment with two tubercles near lateral margins, 1st small, 5th segment with a very large and deep round fovea in the middle, the border of the fovea very distinct. Pygidium (Figs 18-1C; 18-2D) slightly broader than long, finely and densely punctured, median longitudinal carina sharp and straight, lateral carinae broad and low, with an indistinct transverse carina connecting at one-third, interspaces of these carinae and areas within the lateral margins moderately depressed, basal margin broadly raised.

Spermatheca (Figs 18-2H; 18-3B) right-angled bending at two-fifth from apex, acute at apex, then dilated, strongly dilated in the middle; duct weakly sclerotized. Rectal sclerites (Figs 18-2I; 18-2A) reddish brown, no connection between the two sclerites on ventral side, inner angle obtuse and narrow, outer angle truncate.

Distribution. China (Xizang).

Diagnosis. This species can be easily distinguished from other Chinese Chlamisus species by its purplish to reddish bronze coloration and the lacking of sutural teeth; its body size is smaller than most other congener species.