Chlamisus zhamensis Tan, 1981

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 : 133-136

Chlamisus zhamensis Tan, 1981

(Figs 32-1, 32-2; 32-3)

Tan & Wang, 1981: 445 (type locality: Zhangmu, Xizang, Youyi Bridge; type deposited: IZ-CAS); Tan, 1987: 41.

Material examined. Holotype: 1♀, “ Xizang, Zhangmu, Youyiqiao [Chinese letters] / 1680 m / Chinese Academy of Sciences [Chinese letters] // 26. VI. 1975 / coll. Xuezhong Zhang [Chinese letters] // HOLOTYPE ” (IZ-CAS).

Measurements. BL = 4.75 mm, BW = 3 mm, HL = 1.3 mm, HW = 1.5 mm, PL = 2 mm, PW = 2. mm, EL = 3.5 mm, PYL = 1.4 mm, PYW = 1.6 mm, SL = 0.7 mm,

Redescription. Body (Figs 32-1A, 32-2A) rather large, opaque and strongly rugose. Labrum, antennae and tarsi covered with short white hairs; head and bottom of metathorax with sparse short hairs. General color black.

Head (Figs 32-1D; 32-2C) nearly round, slightly broader than long, densely and shallow-roundly punctured, sparsely on upper center of vertex; puncture intervals raised, a very deep and large fovea on upper center of vertex; labrum reddish brown, triangular, almost as broad as long, eyes brownish black.

Antennae (Figs 32-1I; 32-2E) mostly reddish brown, yellowish on underside of scape and on pedicel. Scape three times as long as broad, pedicel triangular, 3rd short and small, 4th slightly dilated, 5–10th flat and broad, serrated, 11th ovate.

Pronotum (Fig. 32-1F) finely and densely punctured, strongly rugose on disc; a large round tubercle on each lateral portion, also some irregular small tubercles and ridges anteriorly; a transverse groove after anterior margin; disc elevation rhombus, with several devious ridges on top, median longitudinal groove deep and broad, a triangular incision in the middle, a pair of very sharp and distinct tubercles on top of posterior-declivity, a pair of small tubercles by the side. Scutellum (Fig. 32-1H) extremely broad at posterior-lateral angles, narrow at base, strongly produced anteriorly, posterior-lateral angles strongly extended, apex acute. Prosternum (Figs 32-1E; 32- 2G) infundibular, prosternal process extended, apex acute.

Elytra (Fig. 32-2F) rounded apically, lateral sides slightly oblique; humeri strongly granulate; deeply and finely punctured on disc, sparse on sides and apex, puncture intervals strongly rugose; suture teeth throughout, sharper near apex; basal margin from scutellum to median row finely rugose and raised; longitudinal ridges indistinct, tubercles sharp; sutural row consisting of three tubercles, 1st obsolete, 2nd large, 3rd merging with 3rd tubercle of median row into a transverse one, 4th indistinct, weakly ridged between 2nd and 3rd, also an indistinct tubercle between sutural and median row above 1st tubercle; median row consisting of four tubercles, 1st large, situated near basal margin, 2nd merging with 2nd tubercle of humeral row into a transverse tubercle, 4th obsolete, 5th largest, longitudinal; humeral consisting of three tubercles, 1st small, weakly ridged between 2nd and 3rd, 3rd rather large; lateral row with two tubercles, 1st transverse, 2nd small; a moderate tubercle at the posterior-lateral angle, with a large tubercle consisting of several small tubercles above it. Legs (Fig. 32-1J) dark reddish brown.

Abdomen (Fig. 32-1G) densely and shallow-roundly punctured; 1st visible abdominal segment with a low tubercle near each lateral margin, 5th segment with a large and shallow triangular fovea in the middle. Pygidium (Figs 32-1C; 32-2D) broader than long, deeply and moderately punctured on depressed areas, densely punctured on apex and base, median longitudinal carina sharp and straight, lateral carinae sharp and narrow, slightly sinuated, with a transverse carina connecting at one-third from base, interspaces of these carinae and the lateral portions moderately depressed, basal margin slightly raised, produced at lateral ends.

Spermatheca (Figs 32-2I; 32-3B) hook-shaped, bending half ways, and acute at apex, the remaining part with even width; duct moderately sclerotized, thin and uncoiled for almost the same length of spermatheca, then strongly dilated into a large cavity, after that gradually narrowed and irregularly coiled about 6 times. Rectal sclerites (Figs 32-2H; 32-3A) strongly sclerotized, weakly connected between the two sclerites on ventral side, inner angle acute, the sclerites triangular, moderately truncate above, with a projection below, outer angle rather acute.

Distribution. China (Xizang).

Diagnosis. This species is similar to C. stercoralis , but it can be distinguished from the latter by the following characteristics: no distinct median longitudinal groove on the pronotum, without S-shaped ridge on the sutural row of elytra, and no teeth-like projections on the sides of pygidium; this species is also similar to C. rugosus by the strongly rugose pronotum and elytra, but it can be distinguished by the strongly depressed vertex of head, the much weaker elevation of pronotum disc and the much more obtuse posterior-lateral angles of elytra.