Chlamisus stercoralis ( Gressitt, 1942 )

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 : 108-113

Chlamisus stercoralis ( Gressitt, 1942)

(Figs 26-1, 26-2; 26-3; 26-4)

Gressitt, 1942b: 355, 371 (orig.: Chlamys stercoralis ; type locality: Hainan; type deposited: LINGNAN); Gressitt, 1946: 96 (as Chlamisus stercoralis ; Fukien, Hainan); Gressitt & Kimoto, 1961: 185 (as synonymy of Chlamys indica Jacoby , nec Guérin, 1840); Kimoto & Gressitt, 1981: 362 (revalid; Thailand); Tan, 1988: 318.

Syn.: Chlamys indica Jacoby, 1901 (nec Guérin, 1840): 163 (type locality: India; type deposited: BMNH); 1908: 277; Gressitt & Kimoto, 1961: 185 (as Chlamisus indicus ); Medvedev, 1968: 564 (as Chlamysus indicus ); Kimoto & Gressitt, 1981: 362 (as synonym of Chlamisus stercoralis ); Tan et al., 1980: 149 (valid species).

Material examined. CHINA: Guangxi Province: 1♀, Pingxiang , 9. IV. 1963, coll. Shuyong Wang ; 1♀, Pingxiang , 1. IV. 1960, coll. Shuyong Wang ; Sichuan Province: 1♂, Mt. Emei [Emeishan], Baoguo Temple [Baoguosi], 11. V. 1957, coll. Keren Huang ; Guizhou Province: 1♀, Shiqian, Jinxing , 670–800 m, 24. VII. 1988, coll. Shuyong Wang ; Yunnan Province: 1♀, Meng-la , 20. IV. 1982, coll. Shengqiao Jiang ; Hainan Province: 1♂ 2♀♀, Mt. Diaoluo , 1000 m, 23. IV. 1980, coll. Shuyong Wang ; 1♂ 1♀, Tianchi , 750 m, 19. III. 1980, coll. Shuyong Wan ; Qiongzhong, Mt. Wuzhi , 800 m, 5. IV. 1980, coll. Fuji Pu ; 1♂, Mt. Wuzhi , 640 m, 4. IV. 1980, coll. Shuyong Wang ; Xizang: 2♂♂, Motuo, Beibeng , 800 m, 20. V. 1983, coll. Yinheng Han (IZ-CAS).

Measurements. BL = 5.2 mm, BW = 3.9 mm, HL = 1.7 mm, HW = 1.7 mm, PL = 2.2 mm, PW = 3.5 mm, EL = 3.9 mm, PYL = 2.1 mm, PYW = 2.1 mm, AL = 1.3 mm, AA = 110°, SL = 0.5 mm.

Redescription. Body (Figs 26-1A; 26-2A) wide and robust, elytral sides oblique, posterior-lateral angle obtuse. Body color black, marked with piceous-cupreous; surface partially smooth, moderately granulate and opaque. Elytra, pronotum and head with short white hairs in each puncture, and with longer hairs on vertex and clypeus; antennae, labrum, palpi, tibiae and tarsi covered with yellowish white hairs.

Head (Figs 26-1D; 26-2E) nearly round, clypeus slightly extended, deeply and densely punctured on vertex, coarsely and shallow-roundly punctured on clypeus; slightly depressed longitudinally between eyes; labrum rather small, rectangular, moderately wider than long, yellowish brown and translucent; eyes also black.

Antennae (Figs 26-1I; 26-2C) yellowish brown on basal three segments, the rest blackish brown. Scape three times as long as broad, pedicel short and subglobular, 3rd segment short and slender equal length with 2nd, 4th dilated, 5–10th flat and broad, serrated, somewhat compact, 11th long and ovate.

Pronotum (Fig. 26-1F) densely and finely punctured; two tubercles on each lateral portion, outer one smaller; disc elevated in rhombus form, somewhat rugose, moderately elevated posteriorly, a transverse depression behind anterior margin, median longitudinal groove wide and throughout, posterior declivity very steep, a longitudinal ridge on each side of median groove, which broken anteriorly, and two pairs of oblique short ridges on each side, outer one shorter. Scutellum (Fig. 26-1H) somewhat narrower than most species, prominent anteriorly, posteriorlateral angles produced. Prosternum (Figs 26-1E; 26-2B) triangular, prosternal process rather acute but not so much extended.

Elytra (Fig. 26-2G) rounded apically, lateral sides oblique; coarsely and deeply punctured, denser near base, sparser towards apex; suture teeth large, only absent at apex; basal margin rugose from scutellum to near median row; longitudinal ridges distinct and sinuate, tubercles small; sutural row sinuate, s-shaped basally, consisting of four tubercles, 1st small, 2nd indistinct, 3rd merging with the 3rd tubercle of median row into a transverse tubercle, 4th merging with 4th of median row into a small curved tubercle; median row consisting of five tubercles, 1st situated near basal margin, 2nd merging with 2nd tubercle of humeral row into a transverse tubercle, 5th largest and longitudinal; humeral row consisting of three tubercles, 1st and 3rd small, sometimes 1st indistinct, with a sinuated ridge extending upwards; lateral row with two tubercles, 1st transverse, 2nd small; one big transverse tubercle at posterior-lateral angle, and a large tubercle consisting of several small tubercles above it. Legs (Fig. 26-1J) rather slender, blackish brown, darker on hind legs, redder on fore legs.

Abdomen (Fig. 26-1G) densely and finely punctured. 1st visible abdominal segment with one tubercle on each side, last segment with a round fovea in the middle, a weak and narrow longitudinal ridge inside. Pygidium (Figs 26-1C; 26-2F) as long as broad, with a small tooth-like projection on each side near base, deeply and coarsely punctured, denser at sides, median longitudinal carina narrow and sharp, lateral carinae sinuate and punctured, with an indistinct transversal carina connecting at one-third from base, where lateral carinae curved mesally, interspaces of these carinae moderately depressed, and the lateral margins somewhat deeply depressed, basal margin punctured.

Aedeagus (Figs 26-3C, 26-3D, 26-3E; 26-4A; 26-4B; 26-4C) slightly constricted at one third from apex, then narrowed anteriorly, rounded apically, with about five coarse pubescence on top of each side, and densely punctured on ventral side of distal part close to apex; median orifice with middle sclerite bending inwards moderately below surface at one-fifth of median lobe, outline very close to outer margin; inner sac globular, narrowed posteriorly, slightly acute on both sides; tegmen moderately sclerotized.

Spermatheca (Figs 26-1B; 26-4D) hook-like bending halfway, moderately acute bending on one-third, thin and sharp at apex, narrowed towards base, duct moderately sclerotized, mostly straight for about 0.5 mm, irregularly coiled 3–4 times, then connecting a dilated round structure, then constricted into one thin tube. Rectal sclerites (Figs 26-3A; 26-4E) strongly sclerotized, weakly connected between the two sclerites on ventral side, inner angle acute, dilated at middle, outer angle raised, with a strong projection facing outwards at lower middle, outer angle strongly acute.

Distribution. China (Fujian, Guangdong, Guangxi, Guizhou, Hainan, Sichuan, Xizang, Yunnan); India, Thailand, Vietnam.

Diagnosis. This species is similar to C. setosus by the S-shaped median row on elytra, but can be easily distinguished from the latter by having no densely arranged golden hairs on pronotum.