Epoicocladius wangi Yan et Liu, 2019

Yan, Chuncai, Liu, Ting, Cao, Wei, Zhang, Xinghua & Liu, Wenbin, 2019, Review of Epoicocladius Šulc et Zavřel from China (Diptera, Chironomidae), Zootaxa 4590 (2), pp. 289-295 : 292-293

Epoicocladius wangi Yan et Liu sp. n.

( Figs. 8–11 )

Diagnostic characters. The new species can be included in the genus Epoicocladius by having bare wings, eyes and squama, and separated from others species in the genus by anal point triangular, needle shaped apically, and inferior volsella strongly developed, triangular, anteriorly and posteriorly bare, without projection.

Description. Male imago (n=2, unless otherwise stated). Total length 1.80–1.90 mm. Wing length 1.45–1.58 mm. Total length / wing length 1.20–1.31. Wing length / length of profemur 2.35–3.12.

Coloration. Thorax, legs and abdomen yellowish brown.

Head. AR 0.65–0.72. Ultimate flagellomere 440–460 µm long. Frontal tubercles absent. Temporal seate re- duced to 4 postorbitals. Clypeus with 12–13 setae. Tentorium 110–120 µm long, 19–23 µm wide. Palpomere lengths (in µm): 25–40, 31–50, 67–78, 125–138, 148–165. Palp segment 5 th / 3 rd: 2.12–2.21.

Thorax. ( Fig. 9 ) Antepronotals with 3 setae, dorsocentrals 6, acrostichals absent, prealars 4. Scutum with median tuft of microtrichia ( Fig. 9 ). Scutellum with 6 setae.

Wing ( Fig. 8 ) VR 1.02–1.17, R with 2–3 setae, Membrane without setae. Brachiolum 1 setae. Squama bare. Cu 2 curved. Costal extension 50–60 μm long. Anal lobe developed.

Legs. Spur of front tibia 25–33 µm long, spurs of middle tibia 12–15 and 12 µm long, spurs of hind tibia 28–33 and 12–15 µm long, comb with 10–11 teeth, 10–13 µm long. Sensilla chaetica hind legs prsent. Lengths (in µm) and proportions of legs as in Table 1 .

Hypopygium ( Figs. 10, 11 ). Tergite IX bearing 12 setae at base of anal point. Laterosternite IX with 3–4 setae. Anal point triangular, needle shaped apically, 40–50 µm long, 25–30 µm wide at base, lateral setae absent ( Fig. 10 ). Phallapodeme 43–50 µm long. Transverse sternapodeme 48–53 µm long. Virga strong, consisting of 4 long spines in sclerotized penis cavity. Superior volsella absent, inferior volsella strongly developed, triangular, anteriorly and posteriorly bare, others area with microtrichia, without projection ( Fig. 10 ). Gonostylus 81–90 µm long, straight, without crista dorsalis. HR 2.21–2.49; HV 1.39–1.49.

Type material. Holotype: ♂ ( BDN No. 12976). CHINA: Sichuan Province, Tibetan Autonomous Prefecture of Garzê , Yajiang County, 14. vi. 1996, light trap, X. Wang . Paratype: 1♂ ( BDN No. 12653), same as holotype .

Etymology. Name after Xin-Hua Wang, for the collector of the materials and his outstanding contribution to the knowledge of Chironomidae in China.

Distribution. Oriental China (Sichuan Provinces)

Discussion. The species agree with the generic diagnostic characters of Epoicocladius by Cranston et al. (1989) by having bare wings, eyes and squama, straight gonostylus and elongate apical palp segment. It differs from other members of the genus by having triangular and needle shaped apically anal point and inferior volsella without pro- jection. The main difference of morphological characters among the genus are listed in table 2 .

Female, pupa and larva are unknown.

Figures

FIGURES 8–11. Epoicocladius wangi Yan et Liu sp. n. Male. 8—wing; 9—thorax and tuft; 10—hypopygium, dorsal view; 11—hypopygium, ventral view.

Tables

TABLE 1. Lengths (µm) and proportion of legs of Epoicocladius wangi Yan et Liu sp. n. (n=2).

	fe	ti	ta 1	ta 2	ta 3	ta 4	ta 5	LR
p1	500–520	570–610	330–350	260–270	160–180	100–110	80–110	0.57–0.58
p2	600–610	550–600	250–280	168–180	67–80	70–80	60–70	0.45–0.47
p3	560–590	620–650	270–300	200–240	80–90	70–80	70–90	0.44–0.46