Amnihayesomyia subflava, Hongqu & Niitsuma, 2020

Hongqu, Tang & Niitsuma, Hiromi, 2020, Review of the genus Amnihayesomyia Niitsuma (Diptera: Chironomidae: Tanypodinae), with descriptions of three new species from China, Zootaxa 4743 (3), pp. 411-418 : 416-417

Amnihayesomyia subflava sp. n.

( Fig. 3 )

Type material. Holotype male, CHINA: Tibet Autonomous Region, Nyingchi Prefecture, Medog Country, Yarlung Tsangpo Grand Canyon , Zhamog-Medog Road , between mileposts 62K and 80K, alt. 2345 m, 5.viii.2015, HQ Tang.

Etymology. From the Latin subflavus, yellowish, referring to the predominant body coloration of the male adult.

Description. Male (n=1). Total length 3.4 mm.

Coloration. Mostly yellow. Thorax yellow with indistinct scutal vittae. Abdomen pale yellow, with dark T VII–IX; T VI somewhat darkened posteriorly. Wing without any marking, RM pale. Legs entirely pale yellow.

Head. Temporals 21. AR 0.57. Clypeus with 22 setae. Lengths of palpomeres 1–5 (μm): 62, 98, 167, 197, 246; Pm 4 / Pm 3 1.2, Pm 5 / Pm 4 1.3. Pm 2 ( Fig. 3A ) apically with 3 robust setae 69–74 μm long, 1.8–1.9 times as long as palpomere width. Eye bridge parallel-sided with 4 ommatidia at narrowest point.

Thorax. Aps 7. ScuT absent. Ac about 30, Dc 15, H 13, Pa 13, Su 2, As II 0, Pes 3. Scutellum with 10 large apical and 15 small anterior setae.

Wing. Length 2.8 mm. VR 0.89. Squama with 23 setae.

Legs. Ti I spur 57 μm long, with 8 lateral teeth. Ti II spurs 64 and 62 μm long, with 10 and 9 lateral teeth, re- spectively; inner spur almost as long as outer spur. Ti III spurs 81 and 59 μm long; inner spur / outer spur 1.4; lateral teeth of inner spur indistinct because of undesirable mounting orientation, outer spur with 8 lateral teeth. Ti III comb with 8 bristles. Lengths and proportions of legs as in Table 3 .

Hypopygium ( Fig. 3B ). T IX with 16 posterior setae. Gonocoxite 197 μm long, and 2.2 times as long as broad at middle. Gonostylus stout, 130 μm long.

Female, pupa and larva. Unknown.

Remarks. The male is similar to that of Amnihayesomyia nepalicola in the wing without any marking, the second palpomere with an apical group of robust setae, and the nearly parallel-sided eye bridge, but separable by the eye bridge with four ommatidia at the narrowest point, and the entirely yellow femur and tibia in the foreleg. According to Murray (1976), the male of A. nepalicola has five ommatidia at the narrowest point in the eye bridge, fore-femora darkened on the apical one third, and fore-tibiae entirely darkened.

Figures

FIGURE 3. Amnihayesomyia subflava sp. n., male. A, Palpomere 2; B, hypopygium, dorsal view.