Ptychoptera yankovskiana Alexander, 1945

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 : 456-459

Ptychoptera yankovskiana Alexander, 1945

( Figs. 1–2 )

Ptychoptera yankovskiana Alexander, 1945: 228 . Type locality: Puksu Pyaksan, Kaukyo Nando ( Korea)

Diagnosis. Wing marked with two brown patches of infuscation and two narrow bands. Epandrium bilobed, each lobe broad and swollen laterally, with uniformly short hairs; surstylus flat and acinaciform with uniformly short hairs, middle of inner edge slightly swollen, base broad with a Y-shaped lobe when viewed ventrally. Hypandrium with a wide membranous region at middle, caudal area with a pair of triangular projections and a pair of small bladeshaped lobes bearing several hairs, apex with a black U-shaped projection.

Description. Male. Body length 8.5–9.5 mm, wing length 7.5–8.0 mm.

Head mostly dark brown, except gena brown with a black elliptical spot medially; clypeus light brown; hairs on head dark brown. Compound eyes black without pubescence. Antenna mostly brown with apical 1/3 of pedicel and basal 1/5 of 1st flagellomere yellow, hairs on antenna dark brown. Proboscis yellow with brown hairs. Palpus yellow with last segment light brown, hairs brown.

Thorax ( Fig. 1 a–b). Pronotum brown with anterior margin yellow. Propleuron brown. Mesonotum black with scutellum brown. Postnotum black. Mesopleuron dark brown with upper 1/2 of anepisternum pale yellow. Metapleuron dark brown. Fore and mid coxae yellow with basal parts brown, hind coxa yellow brown with apical 1/3 yellow; trochanters yellow; femora and tibiae yellow with brown ring apically; 1st tarsomere yellow brown and gradually darkened apically, 2nd to 5th tarsomeres uniformly dark brown. Hairs on legs brown. Relative length of 1st to 5th tarsomeres in hind leg as 9: 1.8: 1.2: 1: 1. Wing ( Fig. 1c ) 3.3 times as long as wide, subhyaline, marked with two brown clouds and two narrow bands as follows: two clouds along basal of R s and fork of M; median band extending from basal of R 2+3 to fork of CuA; subapical band extending from anterior margin of wing, covering tip of R 1, and extending to fork of R 4+5. Veins brown; Sc ending in C not at level of basal 1/3 of R 2+3; Rs straight, about 3 times as long as r-m. Haltere and prehaltere pale with pale hairs.

Abdomen ( Fig. 1a ). First tergum dark brown, 2nd tergum yellow with basal 1/4 and caudal 1/4 brown, 3rd tergum yellow with caudal 1/4 brown, 4th tergum dark brown with anterior margin pale yellow, 5th to 7th terga uniformly dark brown. First sternum pale with caudal 1/2 brown, 2nd sternum yellow with posterior margin brown, 3rd sternum yellow, 4th to 7th sterna dark brown with posterior margins pale yellow. Hairs on abdomen brown.

Male genitalia ( Fig. 2 ) dark brown. Epandrium ( Fig. 2b ) bilobed, each lobe broad and swollen laterally with uniformly short hairs; surstylus flat and acinaciform with uniformly short hairs, middle of inner edge slightly swollen, base broad with a Y-shaped lobe when viewed ventrally; proctiger with long hairs on posterior margin. Gonocoxite ( Fig. 2c ) long and stout, 2.2 times as long as wide, basal apodeme 1/3 as long as gonocoxite; paramere with a pair of slender digitiform projections and a pair of short hook-shaped projections laterally, middle with a hook-shaped projection. Gonostylus ( Fig. 2c ) with the following projections and lobes: a strong retrorse basal projection on inner side armed with 5–6 black short spines; a large basal projection on dorsal side, broad at base, tapered distally, with uniformly short hairs; a flattened and inversed dorsal lobe on middle area with short hairs; a digitiform apical projection, slightly curved to the middle, rounded apically, with dense long hairs. Hypandrium ( Fig. 2d ) triangular, broad basally, anterior margin concaved medially; base with several lateral hairs; middle with a wide membranous region and dense short hairs; caudal area with a pair of triangular projections and a pair of small blade-shaped lobes bearing several hairs; apex with a black U-shaped projection. Aedeagus ( Fig. 2 e–f): basal part of subapical sclerite round with U-liked hollow, apical part of subapical sclerite rectangular.

Female. Body length 8.0–9.0 mm, wing length 7.5–8.5 mm. Similar to male. First tergum brown with anterior margin pale; 2nd tergum yellow with anterior and posterior margins brown; 3rd and 4th terga brown, lateral bases with yellow areas; 5th to 8th terga dark brown. First sternum brown with basal 1/2 pale, 2nd sternum brown with middle area yellow, 3th to 7th sterna dark brown with posterior margins pale yellow. Terminalia ( Fig. 1d ): 8th sternum yellow, slightly swollen ventrally at middle, 2.5 times as long as 7th sternum; circus yellow with brown margin, blade-shaped, 10th tergum + cercus 1.2 times as long as 8th sternum.

Specimens examined: ♂, CHINA, Neimenggu, Kezuohouqi, Daqinggou National Nature Reserve, Yuanshisenlin (42°47'58''N 122°10'44''E, 220 m), 2015. VI.23–VIII.3, Malaise trap. PARATYPES : 30♂♂, same data as holotype ; 11♂♂ 1♀, CHINA, Neimenggu, Kezuohouqi, Daqinggou National Nature Reserve, Yuanshisenlin (42°47'58''N 122°10'44''E, 220 m), 2015.VIII.3–IX.29, Malaise trap ; 7♂♂, CHINA, Neimenggu, Kezuohouqi, Daqinggou National Nature Reserve , 2014.VIII.20–21, Yan Li ; 3♂♂ 1♀, CHINA, Neimenggu, Kezuohouqi, Daqinggou National Nature Reserve , 2014.VIII.21–22, Yuqiang Xi ; 1♀, CHINA, Neimenggu, Kezuohouqi, Daqinggou National Nature Reserve, Yuanshisenlin (180 m), 2014.VII.23, Ding Yang ; 1♀, CHINA, Neimenggu, Kezuohouqi, Daqinggou National Nature Reserve, Yuantou (235 m), 2014.VIII.27, Shi Li ; 1♀, CHINA, Neimenggu, Kezuohouqi, Daqinggou National Nature Reserve, Daqinggou River (169 m), 2014.VIII.27, Li Shi ; 1♀, CHINA, Neimenggu, Kezuohouqi, core area of Daqinggou National Nature Reserve (210 m), 2014.VIII.28, Li Shi ; 1♀, CHINA, Neimenggu, Kezuohouqi, Daqinggou National Nature Reserve, Sanchakou (171 m), 2014.VIII.29, Li Shi ; 2♂♂, CHINA, Neimenggu, Kezuohouqi, Daqinggou National Nature Reserve , Yuanshisenlin, 2013.VII.18, Xiao Zhang .

Distribution. China (Neimenggu); Korea.

Remarks. This species is newly recorded from China. This species was synonymized with P. subscutellaris Alexander, 1921 by Krzeminski & Zwick (1993). Fasbender (2014) described both species and discussed the differences between them. He considered that these differences warrant consideration as distinct species.

Figures

FIGURE 1. Ptychoptera yankovskiana Alexander, 1945. 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 2. Ptychoptera yankovskiana Alexander, 1945. 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.