Mycomya alticola, Väisänen, Rauno, 2013

Väisänen, Rauno, 2013, New Mycomya species from the Himalayas (Diptera, Mycetophilidae): 3. Subgenera Cesamya and Mycomyopsis, Zootaxa 3737 (2), pp. 129-153 : 138-140

Mycomya alticola sp. n.

Figs. 6 A–F

Material studied. Holotype. ♂. NEPAL, 28°00'N, 85°00'E, 10500 ft., 21.V. 1967, Can. Nepal Exp. (in CNC). Paratypes (only ♂♂). 27°58'N, 85°00'E, 11100 ft., black light, 10.VI. 1967, Can. Nepal Exp, 1 ♂ (in MZH); 27°58'N, 85°00'E, 11100 ft., 13.VI. 1967, Can. Nepal Exp., 1 ♀ (in CNC); Gupa Pokali, 27°17'N, 87°30'E, 2900 m – Chouki, 27°12'N, 87°28'E, 2700 m (specimens collected on the way between the two localities), 16.VII. 1972, J. Emoto, 7 ♂♂, 2 ♀♀ (in KUC); Gurza, 27°18'N, 87°33'E, 2100 m – Gupa Pokali, 27°17'N, 87°30'E, 2900 m, 15.VII. 1972, J. Emoto, 2 ♂♂ (in KUC); Lipshiba Kharka, 83°23'E, 28°35'N, 1900 m, 30.X. 1971, A. Nakanishi, 1 ♂ (in KUC).

Description. ♂. Head. Palp and other mouthparts, face and posterior parts of head brown. Antenna brown, base of 1st flagellomere yellowish. Length of 1st flagellomere about 3.5x, 2nd flagellomere 2x, its width. Thorax. Pronotum yellowish, with 2 long setae. Scutum yellow to yellowish with 3 brown longitudinal posteriorly fused stripes. Anepisternum and preepisternum yellow to brownish. Scutellum brownish, with 4 long setae. Laterotergite yellowish to brownish. Mediotergite brownish, posterior part brown, bare. Wing. Length 3.4–4.4 mm. Wing hyaline. Sc ending in R1 slightly distad of middle of small cell, Sc1 missing. Apical part of Sc bearing 2–13 small setae. Small cell about 1.5x as long as wide. Cu fork distally to or below M fork. M ratios: 0.88–0.90, 1.05–1.20. Cu ratios: 0.90–1.09, 1.35–1.80. Small setae: M petiole: 0; M1: 0; M2: 0; Cu petiole: 0; Cu1: 0–1; Cu2: 0. Halter pale yellowish. Legs. Coxae yellow, femora yellow, tibiae and tarsi brownish to brown. Coxa 2 without spur. Leg ratios: bt1:t1 = 0.72–0.77, bt2:t2 = 0.63–0.69, bt3:t3 = 0.54–0.60. Abdomen. Brown. Hypopygium. Figs. 6 A–F, yellowish. Tergal part with 2 pairs of combs, wide outer combs relatively close to each other with only narrow gap between them ( Fig. 6 A). Tergal lateral appendage long, at least 5x as long as wide, basally narrow, apically wide, densely setose, with some curved, flattened setae subapically along median side ( Fig. 6 C). Sternal submedian filament long, slender, curved, extending far beyond apex of aedeagus. Gonostylus about 5x as long as wide, with 4–5 subapical teeth; with small extension on its middle part, with 1 long dark apical spine ( Fig. 6 D; or seldom with blunt-tipped dark spur, Fig. 6 E); and with membraneous lateral lobe distinctly shorter than main branch of gonostylus on opposite site of spine. Aedeagus with 2 lateral lobes almost reaching its apex ( Fig. 6 F). Female. Wing length 4.4 mm. Thorax yellow to yellowish, middle stripe of scutum brown. Abdomen brownish. Leg ratios: bt1:t1 = 0.73, bt2:t2 = 0.64, bt3:t3 = 0.53. Terminalia yellow.

Discussion. The general structure of the male hypopygium of M. alticola is similar to those of the Chinese species M. maoershana Wu & Yang, 1994a, M. copicusa Wu, 1998 , M. paradisa Wu, 1995 and M. qingchengana Wu & Yang, 1995a, as well as that of the Western Palaeartic species M. fennica Väisänen, 1979 . All these species have also the long sternal submedian filaments and bare (or almost bare) M and Cu veins. Mycomya alticola differs from M. maoershana , M. paradisa , M. qingchengana and M. fennica in having the small extension with a spine or a spur in the middle part of the gonostylus ( Figs. 6 D–E). Mycomya alticola differs from M. maoershana , described from Guangxi, southern China, also in having a longer tergal lateral appendage, with basal part slightly wider than the middle part ( Fig. 6 C; cf. Wu & Yang 1994a: figs. 6–8). Mycomya paradisa , described from Zhejiang, eastern China, has the setae of the tergal lateral appendage in two separate groups (Wu 1995: figs. 4–5), not along the whole tergal lateral appendage as in M. alticola . The tergal lateral appendage of M. copicusa , known from Zhejiang, is distinctly narrower than in M. alticola , without any wide apical part, and its strongly curved gonostylus has only 3 teeth and is lacking the membranous lateral lobe (Wu 1998: figs. 1–3). Mycomya qingchengana , which was described from Sichuan, southwestern China, has only one strong seta on the both sides below the tergal combs, whereas M. alticola has two, and the aedeagus of M. qingchengana appears to have some strong setae (Wu & Yang 1995a) unlike M. alticola ( Fig. 6 F). The tergal lateral appendage of M. fennica has flattened setae only in the apical part, its gonostylus lacks the spur (Väisänen 1984: figs. 1017–1018) and it has small setae on wing veins M and Cu.

Etymology. The species name is a noun in apposition and refers the generic name of the Royle’s mountain vole, Alticola roylei (Grey).

Figures

FIGURE 6. Mycomya alticola sp. n., male hypopygium. A – B tergal and sternal views, C tergal lateral appendage, twice enlarged, D – E gonostyli (of holotype) in different positions, twice enlarged, F apex of aedeagus, sternal view, twice enlarged. Scale 0.2 mm.