Bryophaenocladius mucronatus, Lin, Xiaolong, Qi, Xin & Wang, Xinhua, 2012

Lin, Xiaolong, Qi, Xin & Wang, Xinhua, 2012, Two new species of Bryophaenocladius Thienemann, 1934 (Diptera, Chironomidae) from China, ZooKeys 208, pp. 51-60 : 53-56

Bryophaenocladius mucronatus sp. n. Figures 2-4

Diagnosis.

The male imago can be distinguished from known species of the genus by the following combination of characters: third palpomere without apical digitiform projection; squama with 1-7, 4 setae; pseudospurs present on ta1 and ta2 of mid and hind legs; anal point hyaline, slender with pointed apex; tergite IX columnar; inferior volsella thumb-shaped, with 0-5, 3 setae.

Description.

Male imago (n = 29). Total length 2.20-3.00, 2.51 mm. Wing length 1.33-1.76, 1.55 mm. Total length/wing length 1.43-1.90, 1.65. Wing length/length of profemur 2.50-3.34, 2.75.

Coloration.Dark brown.

Head. AR 1.13-1.43, 1.26. Ultimate flagellomere 415-455, 430 μm long. Temporal setae 7-11, 9 including 2-4, 3 inner verticals; 4-6, 5 outer verticals and 1-2, 2 postorbitals. Clypeus with 2-5, 3 setae. Tentorium 105-150, 130 μm long, 18-25, 20 μm wide. Stipes 105-110, 108 μm long, 7-10, 8 μm wide. Palpomere lengths (in μm): 20-50, 35; 30-95, 47; 55-110, 80; 60-100, 80; 100-125, 113. L: 5th/3rd 1.40-1.82, 1.56. Third palpomere without apical digitiform projection.

Wing (Fig. 2). Anal lobe developed. Coarse punctation easily visible at 40x magnification. VR 1.16-1.33, 1.26. Costa extension 40-63, 48 μm long. Brachiolum with 1-3, 2 setae. R with 3-6, 4 setae; R4+5 with 0-1, 0 seta. Remaining veins bare. Squama with 1-7, 4 setae.

Thorax. Antepronotum with 3-8, 4 lateral setae. Dorsocentrals 5-13, 9; acrostichals 3-10, 7; prealars 2-5, 3. Scutellum with 2-8, 4 setae.

Legs. Spur of fore tibia 16-65, 45 μm long; spurs of mid tibia 20-40, 33 μm and 12-27, 20 μm long; spurs of hind tibia 42-58, 50 μm and 11-40, 23 μm long. Lateral denticles appressed to main shaft. Hind tibial comb with 6-16, 13 spines. Pseudospurs present on ta1 and ta2 of mid and hind legs, 18-23, 20 μm long. Width at apex of fore tibia 23-38, 30 mm, of mid tibia 25-35, 27 mm, of hind tibia 30-40, 35 mm. Lengths (in μm) and proportions of legsas in Table 1.

Hypopygium (Figs 3-4). Anal point hyaline, slender, with pointed apex, 45-90, 70 μm long, 25-35, 30 μm wide. Anal point length/width: 2.14-2.71, 2.45. Tergite IX columnar, with 10-22, 15 setae, laterosernite IX with 4-8, 6 setae. Phallapodeme 45-85, 70 μm long. Transverse sternapodeme arcuate with developed oral projection, 68-100, 88 μm long. Gonocoxite 175-212, 190 μm long. Gonostylus 68-100, 87 μm long with 1-2, 1 megaseta, 8-13, 10 μm long. Crista dorsalis low. Inferior volsella thumb-shaped, 23-35, 27 μm long, with 0-5, 3 setae. Virga 10-25, 16 μm long, composed of 1-9, 5 spines. HR 1.95-2.36, 2.12. HV 2.59-3.00, 2.71.

Type materials.

Holotype: ♂ (BDN. I4B20), China, Zhejiang Province: Quzhou City, Kaihua County, Gutian Mountain, 29°14'35"N, 118°06'41"E, 18.iv.2011, Lin XL, sweeping net. Paratypes (28♂♂): 2♂♂, as holotype; 1♂, Zhejiang Province, Lishui City, Qinyuan County, 27°45'08"N, 119°12'26"E, 15.iv.1994, Wu H, sweeping net; Fujian Province: 11♂♂, Wuyi Mountain, 27°38'22"N, 117°56'56"E, 26.iv.1993, Wang XH, sweeping net; Sichuan Province: 7♂♂, Wenchuan County, 30°59'27"N, 103°26'44"E, 14.vii.1987, Li XZ, sweeping net; 7♂♂, Wolong National Nature Reserve, 30°45'23"N, 103°13'55"E, 27.vii.1987, Li XZ, sweeping net.

Etymology.

The species name is from Latin mucronatus, pointed, referring to the shape of apex of anal point.

Remarks.

The present new species resembles to Bryophaenocladius bicolor Wang, Sæther & Andersen, 2001 in the shape of anal point, but it can be separated from Bryophaenocladius bicolor in the following combination of characters in Table 2.

Female and immature stages unknown.

Distribution.

The species was found in Fujian, Sichuan and Zhejiang Provinces (Oriental China).