Ptychoptera separata, Kang & Xue & Zhang, 2019

Kang, Zehui, Xue, Zhaoxiang & Zhang, Xiao, 2019, New species and record of Ptychoptera Meigen, 1803 (Diptera: Ptychopteridae) from China, Zootaxa 4648 (3), pp. 455-472 : 468-471

Ptychoptera separata sp. nov.

( Figs. 9–10 )

Diagnosis. Wing faintly infuscated, unmarked; wing with r-m some distance before fork of Rs. Epandrium broad and round, posterior margin concave with four papillate projections on each side, proctiger with a V-shaped projection. Gonostylus simple, club-shaped, board basally with several short hairs in inner edge, narrowed at middle, slightly curved apically to the middle.

Description. Male. Body length 8.0–9.0 mm, wing length 8.5–10.0 mm.

Head dark brown, gena with a black elliptical spot medially; clypeus yellow brown with brown hairs. Compound eyes black without pubescence. Antenna uniformly brown with dark brown hairs. Proboscis yellow with brown hairs. Palpus yellow with terminal of the last segment brown, hairs brown.

Thorax ( Fig. 9 a–b). Pronotum brown with anterior margin yellow brown. Propleuron brown with anterior margin bearing a patch of dense brown hairs. Mesonotum and postnotum black with scutellum brown. Mesopleuron and metapleuron dark brown with upper 1/2 of anepisternum yellow. Fore coxa yellow with basal 1/4 dark brown, mid coxa yellow with basal 1/4 brown; hind coxa brown with apical 1/3 yellow; fore trochanter yellow brown, mid and hind trochanters yellow; fore and mid femora yellow brown and gradually darkened apically; hind femora mostly yellowish brown, gradually darkened basally and apically; fore and mid tibiae brown, slightly faded at apical area; hind tibia dark brown with apical 1/3 yellow, posterior margin with a narrow brown ring; tarsomeres uniformly dark brown. Hairs on legs dark brown. Relative length of 1st to 5th tarsomeres in hind leg as 11: 2.4: 1.8: 1.2: 1. Wing ( Fig. 9c ) 3.5 times as long as wide, subhyaline, faintly infuscated, unmarked. Veins brown; Sc ending in C at level of basal 1/3 of R 2+3; Rs slightly curved at base, 4 times as long as r-m; r-m some distance before fork of Rs. Halter and prehaltere pale yellow with pale hairs.

Abdomen ( Fig. 9a ). First tergum dark brown, other terga brown with bases of 3th and 4th terga yellowish brown. First and 2nd sterna brown, 3rd and 4th sterna yellow with caudal 1/3 brown, 5th sterna brown with caudal 1/2 dark brown, 6th and 7th sterna dark brown. Hairs on abdomen dark brown.

Male genitalia ( Fig. 10 ) dark brown. Epandrium ( Fig. 10b ) broad and round, posterior margin concave with four papillate projections on each side, proctiger with a V-shaped projection bearing uniformly short hairs. Gonocoxite ( Fig. 10c ) short and stout, 2.2 times as long as wide, basal apodeme small; paramere with two pair of papillate projections and a pair of S-curved projections. Gonostylus ( Fig. 10c ) simple, club-shaped, board basally with several short hairs in inner edge, narrowed at middle, slightly curved apically to the middle, with several short hairs. Hypandrium ( Fig. 10d ) base broad when viewed ventrally, with a pair of slender projections extending beyond posterior margin, inside of each projection with dense long hairs; median region with a stilliform lobe and a tongue-shaped lobe, each side with a club-shaped projection; posterior margin with an umbrella-shaped projection bearing dense short hairs. Aedeagus ( Fig. 10 e–f): subapical sclerite triangle, apex of subapical sclerite with a pair of elliptical lobes.

Female. Unknown.

Type material. HOLOTYPE: ♂, CHINA, Xizang, Motuo, Mt. Galongla (3026 m), 2013.VIII.13, Xiaoyan Liu . PARATYPES: 3♂♂, same data as holotype ; 1♂, CHINA, Xizang, Bomi, Lulang (3220 m), 2013.VII.14, Xiaoyan Liu .

Distribution. China (Xizang).

Etymology. This new species is named after the wing, in reference to the significant degree of separation between r-m and the fork of Rs.

Remarks. This new species and P. tibialis Brunetti, 1911 from India are similar in the wing venation, but the new species can be easily separated from the latter by the fore and mid femora yellow brown with apical 1/3 dark brown, the fore and mid tibia mostly dark brown and the abdomen mostly brown. In P. tibialis , the fore and mid femora are bright yellow, the fore and mid tibia mostly yellow and the abdomen mostly yellow. The new species can be distinguished from other Ptychoptera known from China by the wing with r-m some distance before fork of Rs. This feature also exists in three European species, P. albimana (Fabricius, 1787) , P. alina Krzeminski et Zwick, 1993 and P. incognita Török, Kolcsár et Keresztes, 2015 , but the new species can be easily separated from them by the wing being unmarked, whereas in the European species the wings have obvious spots.

Figures

FIGURE 9. Ptychoptera separata sp. nov. a. Habitus of male, lateral view, scale bar = 2.0 mm; b. Thorax, dorsal view, scale bar = 0.5 mm; c. Wing, scale bar = 1.0 mm.

FIGURE 10. Ptychoptera separata sp. nov. a. Male genitalia, lateral view; b. Epandrium, dorsal view; c. Gonocoxite and gonostylus, dorsal view; d. Hypandrium, ventral view; e. Aedeagus, anterior view; f. Aedeagus, lateral view. Scale bars = 0.2 mm.