Ptychoptera lucida, 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 : 465-468

Ptychoptera lucida sp. nov.

( Figs. 7–8 )

Diagnosis. Body brownish black. Wing marked with four weak brown clouds and one indistinct brown band. Epandrium bilobed, lobes broad and swollen laterally with a quadrate projection on caudal area bearing dense short hairs; surstylus digitiform and broad basally with short hairs, curved inwards at middle, base with a Y-shaped lobe. Hypandrium triangular, broad basally, anterior margin concave medially; base with several lateral hairs; middle with a wide membranous region; apex with two papillate projections.

Description. Male. Body length 7.0 mm, wing length 7.0 mm.

Head brownish black with clypeus and gena brown, gena with a black elliptical spot medially; hairs on head dark brown. Compound eyes black, without pubescence. Antenna brown with apical 1/3 of pedicel and base of 1st flagellomere yellowish brown, hairs dark brown. Proboscis yellow with brown hairs. Palpus yellow with last segment pale yellow, hairs dark brown.

Thorax ( Fig. 7 a–b). Pronotum and propleuron brownish black. Mesonotum and postnotum mostly black, except middle area of scutellum yellow with a patch of dense brown hairs. Mesopleuron and metapleuron brownish black with upper 1/2 of anepisternum pale. Coxae yellow with basal margin dark brown; trochanters yellow; femora yellow with a dark brown ring apically; tibiae yellow with a dark brown ring apically; 1st tarsomere yellow and gradually darkened apically, other tarsomeres dark brown. Hairs on legs dark brown. Relative length of 1st to 5th tarsomeres in hind leg as 9: 2.4: 1.8: 1.2: 1. Wing ( Fig. 7c ) 3.5 times as long as wide, subhyaline, marked with four weak brown clouds and one indistinct brown band: four weak brown clouds at base of Rs, tip of R 1, fork of R 4+5 and fork of M 1+2; median band extending from basal of R 2+3 to middle section of CuA. Veins brown; Sc ending in C not at level of basal 1/3 of R 2+3; Rs slightly curved at base, 2 times as long as r-m. Halter pale yellow with brown hairs, prehaltere pale brown.

Abdomen ( Fig. 7a ). Terga brownish black with posterior margins of 3rd to 5th terga pale. Sterna brownish black with posterior margins of 3rd to 7th sterna pale. Hairs on abdomen pale.

Male genitalia ( Fig. 8 ) brownish black. Epandrium ( Fig. 8b ) bilobed, lobes broad and swollen laterally with a quadrate projection on caudal area bearing dense short hairs; surstylus digitiform and broad basally with short hairs, curved inwards at middle, base with a Y-shaped lobe; proctiger bare medially, clothed with dense long hairs on posterior margin. Gonocoxite ( Fig. 8c ) short and stout with several short hairs laterally, 1.6 times as long as wide; basal apodeme 1/3 as long as gonocoxite; paramere with two pair of projections, outer projection slender, inner projection hook-shaped. Gonostylus ( Fig. 8c ) comprised of the following projections and lobes: a small S-shaped basal projection on inner side with short hairs; a large basal projection on dorsal side, broad at base with a small papillate projection, tapered and curved to the middle; a duckbilled lobe on middle area; an apical projection digitiform, rounded apically, with short hairs. Hypandrium ( Fig. 8d ) triangular, broad basally, anterior margin concaved medially; base with several lateral hairs; middle with a wide membranous region; apex with two papillate projections, dorsal papillate projection with several long hairs. Aedeagus ( Fig. 8 e–f): subapical sclerite tongue-shaped, apex of subapical sclerite round.

Female. Body length 8.5–9.0 mm, wing length 8.5–9.0 mm. Similar to male. Terminalia ( Fig. 7d ): 8th sternum brown and swollen ventrally at middle, 2.5 times as long as 7th sternum; cercus brown, blade-shaped, 10th tergum + cercus 1.2 times as long as 8th sternum.

Type material. HOLOTYPE: ♂, CHINA, Xinjiang, Buerjin, Hemu (48°58'N 87°44'E, 1134 m), 2016.VII.11, Jinlong Ren . PARATYPES: 2♂♂ 2♀♀, CHINA, Xinjiang, Habahe, Forest Farm (1263 m), 2014.VI.30, Xuankun Li .

Distribution. China (Xinjiang).

Etymology. The specific name refers to the bright black coloration of body.

Remarks. The new species is somewhat similar to P. scutellaris Meigen, 1818 from Europe, but it can be easily separated from the latter by the femora and tibiae mostly yellow and the surstylus curved toward median. In P. scutellaris , the femora and tibiae are mostly blackish brown and the surstylus is straight. The new species is also similar to P. hugoi Tjeder, 1968 from Europe and Mongolia, but it can be separated from the latter by the wing with four weak brown clouds and one indistinct brown band and the inner projection of paramere hook-shaped. In P. hugoi , the wings have weak infuscation and the inner projection of paramere is straight.

Figures

FIGURE 7. Ptychoptera lucida 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; d. Female terminalia, lateral view, scale bar = 0.2 mm.

FIGURE 8. Ptychoptera lucidasp. 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.