Parachironomus poyangensis, Yan, Chun-Cai, Yan, Jiao, Jiang, Li, Guo, Qin, Liu, Ting, Ge, Xin-yu, Wang, Xin-Hua & Pan, Bao-ping, 2015

Yan, Chun-Cai, Yan, Jiao, Jiang, Li, Guo, Qin, Liu, Ting, Ge, Xin-yu, Wang, Xin-Hua & Pan, Bao-ping, 2015, Parachironomus Lenz from China and Japan (Diptera, Chironomidae), ZooKeys 494, pp. 31-50 : 37-39

Taxon classification Animalia Diptera Chironomidae

Parachironomus poyangensis sp. n. Figs 11-13

Etymology.

Named after the type locality. The species epithet is adjectival for the purposes of nomenclature.

Type material.

Holotype male (BDN No. 21987). CHINA: Jiangxi Province, Poyanghu Lake, Nanjishan Natural Conservation area, 12. vi. 2004, sweep net, C. Yan. Paratypes: 2 males, data same as holotype.

Diagnostic characters.

The new species is distinguished by the following combination of characters: body size small, thorax and abdomen yellowish green, wing cells without setae, mid and hind tibiae each with single spur, anal point nearly parallel-sided, superior volsella elongate digitiform, without distal swelling or projection, gonostylus nearly straight and of about even circumference throughout.

Description.

Male imago (n=3). Total length 2.25-2.32, 2.28 mm. Wing length 1.08-1.11, 1.10 mm. Total length / wing length 2.08-2.09, 2.09. Wing length / length of profemur 2.20-2.30, 2.25.

Coloration. Thorax yellowish green. Femora of front legs yellowish green with distal parts brown, tibiae and tarsomeres dark brown; mid and hind legs yellowish green with tarsomeres IV, V dark brown. Abdomen yellowish green.

Head. AR 1.76-1.84, 1.80. Terminal flagellomere 450-470, 462 mm long. Frontal tubercles absent. Temporal setae 11-13, 12, including 3 inner verticals, 3-4, 3 outer verticals and 5-6, 5 postorbitals. Clypeus with 15-18, 17 setae. Tentorium 90-95, 92 mm long, 25-26, 25 mm wide. Palpomere lengths (in mm): 25-27, 26; 30-32, 31; 83-85, 84; 98-104, 100; 145-156, 151. Length ratio 5th /3rd palpomere 1.75-1.78, 1.77.

Thorax. Antepronotals 3-4, 3; acrostichals 8-9, 9; dorsocentrals 10-12, 11; prealars 3. Scutellum with 5-6, 5 setae.

Wing (Fig. 11). VR 1.15-1.17, 1.16. Cell surfaces without setae. R with 11-13, 12 setae, R1 with 8-9, 8 setae, R4+5 with 17-18, 17 setae. Brachiolum with 2 setae. Squama with 10-12, 11 setae.

Legs. Front tibia with 2 subapical setae, 108-110, 109 and 118-130, 126 µm long, mid and hind tibiae each with a single spur, spur of middle tibia 20-22, 21 µm long, comb with 28-30, 31 teeth, 10 µm long; spur of hind tibia 28-30, 29 µm long, comb with 42-46, 44 teeth, 10-12, 11 µm long. Tarsus 1 of mid leg with 6-7, 7 sensilla chaetica, hind leg without sensilla chaetica. Lengths (in µm) and proportions of legs as in Table 3.

Hypopygium (Figs 12, 13). Laterosternite IX with 3-4, 3 setae. Anal tergite bands V-shaped. Tergite IX with conical posterior margin, bearing 13-15, 14 setae at base of anal point. Anal point originating from caudal margin of anal tergite, parallel-sided, slightly pointed apically, 50-55, 52 mm long, 6-8, 7 mm wide at base, 4-5, 4 mm wide at apex. Transverse sternapodeme 27-32, 30 mm long. Phallapodeme 45-48, 46 mm long. Superior volsella straight, columnar, distal parts not widened, with an apical seta and a subapical seta, both arising from distinct setal pits. Inferior volsella with a moderately blunt caudal projection, not reaching beyond caudal margin of anal tergite. Gonocoxite 75-80, 77 mm long, with 3-4, 3 strong medial setae. Gonostylus 112-115, 113 mm long, parallel-sided, curved distally, bearing 8-10, 9 setae along distal inner margin. HR 0.65-0.70, 0.67; HV 1.96-2.02, 1.99.

Distribution.

The species is known only from the type locality in Oriental China.