Tephrochlamys qinghaiensis, Zeng & Xu & Yang, 2023

Zeng, Wei, Xu, Xingnong & Yang, Ding, 2023, Subfamily Heteromyzinae newly recorded from China with description of one new species (Diptera: Heleomyzidae), Zootaxa 5264 (2), pp. 293-298 : 294-295

Tephrochlamys qinghaiensis sp. nov.

( Figs. 3–7 , 8–13 )

Diagnosis. Scutellum dark brown with brownish yellow posterior margin. Abdomen dark brown except apical margin of tergites 1–5 blackish and hypopygium partly dark yellow. Anterior postsutural dorsocentral bristle shorter than posterior two bristles. First dorsocentral bristle closer to 2 nd than to suture, with six rows of acrostichal bristles between them.

Description. Male. Body length 7.0– 7.2 mm, wing length 7.2–7.4 mm. [Holotype J, body length 7.2 mm, wing length 7.4 mm]

Head ( Fig. 4–6 ) brownish yellow with yellowish pollen; ocellar triangle blackish, occiput more or less blackish at middle. Eyes reddish brown. Hairs and bristles on head black, hairs rather short. 2 orbital bristles much shorter than ocellar bristles, anterior one almost as long as posterior one; 2 long vertical bristles. 2 very long ocellar bristles nearly as long as vertical bristles, 2 short postocellar bristles crossed apically and distinctly shorter than ocellar bristles. Antenna brownish yellow except first flagellomere dark yellow, almost as long as head height; scape with black dorsal hairs at tip; pedicel with numerous short scattered bristles, and with circlet of black hairs, 1 black dorsal bristle, several black ventral bristles at tip. First flagellomere long and oval, 1.2 times (exact ratios present in both the holotype and paratypes) longer than wide; arista dark brown with brownish yellow basal segment, short plumose, 3.1 times (exact ratios present in both the holotype and paratypes) longer than first flagellomere. Proboscis brownish yellow with brown bristles; palpus dark yellow with black hairs and 3 black ventral bristles.

Thorax ( Fig. 6 ) dark brown with yellowish pollen; scutellum brown. Hairs and bristles on thorax black. 1 humeral bristle and a few sparse bristles on humerus; 3 postsutural dorsocentral bristles, anterior one shorter than posterior two, first dorsocentral bristle closer to 2 nd than to suture, with six rows of acrostichal bristles between them; 1 presutural bristle; 2 notoplerual bristles; 1 intra-alar bristle, 1 supra-alar bristle, 1 postalar bristle. Scutellum rounded apically, with 2 pairs of scutellar bristles; katepisternum and propleuron each with 1 bristle.

Legs mostly brownish yellow; fore coxa yellow, mid and hind coxae dark brownish yellow; fore femur dark brown and hind femur brown except extreme base and apex more or less dark yellow; all tibiae brown, but widely brownish yellow at middle; all tarsomeres 4–5 dark brown. Hairs and bristles on legs black. All femora slightly thickened. Fore femur with an irregular row of 6–8 long posterodorsal bristles and a row of 6–7 long posteroventral bristles. Fore and hind tibiae each with 1 slightly short thick ventral apical bristle and 1 slightly short thick dorsal apical bristle. Mid tibia with 1 long thick ventral apical bristle and 1 short dorsal apical bristle.

Wing ( Fig. 7 ) nearly hyaline, slightly brownish, veins brown except anterior veins brownish yellow; veins r-m and dm-cu with brownish spots not obvious; posterior cell with brownish apical stripes not obvious; R 2+3 and R 4+5 distinctly bent, A 2 reaching margin; Costa with costal spines near subcostal break. Squama and axillary lobe nearly hyaline with brown hairs. Halteres pale yellow with brownish yellow base.

Abdomen dark brown with yellowish pollen except apical margin of tergites 1–5 black and hypopygium mostly dark brown and partly dark yellow. Hairs and bristles on abdomen black; tergites 1–5 with long thick bristles at posterior margin and sternites 2–5 with short thick bristles at posterior margin.

Male genitalia ( Fig. 8–13 ): Cercus symmetrical and large, apically rounded, pale yellow, 1.9 times longer than basal wide. Epandrium sparsely with black thick bristles different in length. Hypandrium symmetrical. Surstylus almost triangular in lateral view, 1.8 times longer than wide, apically with distinctly thickened obtuse process. Distiphallus short.

Female. Unknown.

Type material. Holotype J, Qinghai, Huzhu, Baimuxia, Jianchazhan , [37°0'7"N, 102°7'15"E], 3060 m, 2021. VI. 30, Wei Zeng ( CAU) . Paratypes 3J, same data as holotype ( CAU) .

Distribution. China (Qinghai).

Remarks. The new species is similar to T. laeta Meigen , but may be separated from the latter by the following features: (1) body longer (body length 7.0– 7.2 mm); (2) six rows of acrostichal bristles. In T. laeta , the body is shorter (3.5–4.0 mm), and four rows of acrostichal bristles are present between the postsutural dorsocentral bristles.

Etymology. The specific name refers to the type locality Qinghai.

Figures

FIGURES 3–7. Tephrochlamys qinghaiensis sp. nov., male. Habitus in lateral view (3). Head in frontal view (4), lateral view (5). Head and mesoscutum in dorasl view (6). Wing (7). Scale bar = 1.0 mm.

FIGURES 8–13. Tephrochlamys qinghaiensis sp. nov., male genitalia. Epandrial complex in caudal view (8). Epandrium and cerci, lateral view (9). Hypandrial complex in dorsal (10) and ventral (11) view. Outer surface (12) and inner surface (13) of left gonostylus. Abbreviations: see Material and methods. Scale bar = 0.2 mm.