Pseudocossonus yunnanensis Omar, Zhang et Davis

Omar, Youssef Mohamed, Zhang, Runzhi & Davis, Steven R., 2006, Descriptions of two new species of Pseudocossonus Wollaston (Coleoptera: Curculionidae: Cossoninae) from mainland China with a key to the world species, Zootaxa 1375, pp. 59-68 : 64-67

Pseudocossonus yunnanensis Omar, Zhang et Davis , sp. nov.

(Figs 4–7, 14–17)

Holotype. Female. China. Yunnan: [Menglun [21.9N, 101.2E], Yunnan Province; 24 IV 1981, collected by Peiyu Yu ( IOZ).

Diagnosis. Body 8.54 mm long; head and pronotum dark reddish-brown, elytra a slightly lighter reddish-brown, antenna and legs dark reddish-brown; scrobe located at anterior 1/2 of rostrum and reaching under ventral margin of eye, with upper margin strongly projected; eyes black; pronotum slightly longer than wide, constricted anteriorly, dorsally curved; intervals impunctate, broadly convex, smooth, sub-equal in width, width greater than 2x diameter of punctate striae.

Description. Holotype, female. Measurements: BL: 8.54 mm; EL: 4.90 mm; EWB: 2.40 mm; EWW: 2.40 mm; PL: 2.08 mm; PW: 1.77 mm; RL: 1.10 mm; RWA: 0.57 mm; RWB: 0.55 mm; AL: 1.68 mm; ASL: 0.60 mm; AFL: 0.53 mm; ACL: 0.30 mm; ACW: 0.25 mm. Habitus: elongate, oblong, and narrow, greatest width at base of elytra, lateral margins of elytra parallel before declivity. Color: head and pronotum dark reddish-brown to chestnut brown, elytra lighter reddish-brown to castaneous, antenna and legs castaneous, glossy, vitreous throughout. Rostrum ( Figs 6–7 ): moderately long, slightly longer than 0.5 x length of pronotum, gently curved, uniform in width, although slightly swollen at point of antennal insertion, with minute sub-circular punctures throughout. Scrobe conspicuous, deep, anterior 1/4 slightly visible in dorsal view, located at anterior 1/ 2 of rostrum and reaching under ventral margin of eye, anterior end extending slightly beyond middle of rostrum, point of antennal insertion at basal 1/4 of rostrum. Antenna: chestnut brown, long, stout; scape shorter than length of funicle and club combined, with scattered sub circular punctures; apical 2/3 widened slightly; funicle slightly compact, with 7 subclavate articles, long, sparse, suberect setae with a pale hue; club composed of 3 articles, pale yellowish-brown, ovate, with densely appressed and sub-erect setae. Eyes: black, moderately convex, sub-circular, with coarse, convex facets, widely separated dorsally, located laterally before base of rostrum. Head: shallowly constricted behind eyes, with minute, sub-circular punctures, punctures separated by approximately 2– 3 x puncture diameter; posterior 1/2 glabrous, glossy, impunctate; head ventrally smooth, impunctate, with transverse rugae posteriorly. Pronotum: slightly longer than wide, constricted anteriorly, dorsally curved, with fine circular punctures throughout, punctures separated by approximately 2– 3 x puncture diameter, basal margin sublinear, lateral margins broadly curved. Scutellum : small, chestnut brown, glossy, vitreous, more or less level with elytra, feebly convex. Elytra: shiny, epipleural fold modified to close elytra, disc slightly convex, elongate; lateral sides parallel until posterior 1/4, beyond moderately rounded, apical posterior margin broadly rounded; striae with shallow, subcircular punctures, punctures separated by approximately 1– 2 x puncture diameter; intervals impunctate, barely convex, smooth, subequal in width, width slightly greater than 2x diameter of striae; humeri truncate, subquadrate, umbonate. Ve n t e r: with sparse, minute puntures throughout, punctures separated by 2– 4 x puncture diameter; prosternum coarsely, shallowly and sparsely punctate, procoxal cavity closed, procoxae separated by 0.5 x diameter of coxa; mesosternum with mesocoxal cavity closed, mesocoxae separated by approximately 1.5 x distance between metacoxae, posterior margin linear; metasternum with metacoxal cavity open; ventrites: with sparse, minute punctures, punctures on I–IV separated by distance approximately 2– 4 x puncture diameter, punctures more dense on V; I and II nearly confluent with a small suture; III and IV sub-equal in width. Legs: femur longer than tibia, texture smooth, vitreous, widened medially, sparsely punctate, proximal and distal ends fuscous; tibia moderately strong, with circular, sparse punctures, and fine erect setae, proximal and distal ends fuscous, uncus at outer apical angle slightly shorter than tarsomere 5, small mucro on inner apical margin, inner subapical surface with long setae; tarsus with tarsomer 1 approximately 2x longer than tarsomere 2, bearing pale, suberect setae; tarsomere 5 long, wide basally and becoming slightly narrower apically, smooth, glossy, curved; pretarsal claw simple. Abdomen and female genitalia: tergites, 8th sternite, hemisternites and spermatheca as illustrated in Figs 14–17. Pygidium with dense punctures, punctures separated by approximately 0.5– 1 x puncture diameter. Apophysis of 8th sternite more than 2 x length of 8th sternite. Hemisternite with stylus approximately 1/ 5 x length of coxite. Spermatheca narrow, more or less same width throughout. Etymology. The specific epithet is derived from the type location, Yunnan, China. Host plant: Unknown.

Distribution: Yunnan Province, southern China.

FIGURES 10–13. P. shanghaiensis , holotype, abdomen and female genitalia. 10, tergites; 11, 8th sternite; 12, hemisternites; 13, spermatheca.

FIGURES 14–17. P. yunnanensis , holotype, abdomen and female genitalia. 14, tergites; 15, 8th sternite; 16, hemisternites; 17, spermatheca.

Figures

FIGURES 6 – 9. Head and rostrum. 6 – 7, P. yunnanensis, holotype, dorso-anterior and lateral view; 8 – 9, P. shanghaiensis, holotype, dorso-anterior and lateral view.