Ptychoptera emeica, 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 : 460-462

Ptychoptera emeica sp. nov.

( Figs. 3–4 )

Diagnosis. Wing marked with two brown bands. Gonostylus comprised of five projections and lobes. Hypandrium rectangular, anterior margin concave medially, posterior margin with a pair of L-shaped projections and a triangular projection, with short hairs basally and dense long hairs posteromedially.

Description. Male. Body length 7.5–9.0 mm, wing length 8.0–9.0 mm.

Vertex and frons brown; face and clypeus yellow with light brown hairs; gena yellow with a black elliptical spot medially, hairs on gena brown; occiput yellow. Compound eyes black without pubescence. Antenna light brown with scape, pedicel and basal 1/2 of 1st flagellomere yellow, hairs dark brown. Proboscis yellow with light brown hairs. Palpus yellow with last segment gradually darked apically, hairs brown.

Thorax ( Fig. 3 a–b). Pronotum yellow with posterior margin brown. Propleuron yellow. Prescutum, scutum and paratergite uniformly black. Scutellum mostly dark brown, middle area yellow with a patch of dense brown hairs. Postnotum dark brown. Laterotergite mostly brown, outer 1/2 yellow with dense dark brown hairs. Mesopleuron and metapleuron uniformly yellow. Coxae and trochanters yellow; fore femur yellow and gradually darkened apically; mid and hind femora yellow with brown ring apically; tibiae yellow with brown ring apically; 1st tarsomere of fore and mid legs yellow brown, 1st tarsomere of hind leg yellow and gradually darkened apically, other tarsomeres dark brown. Hairs on legs brown. Relative length of 1st to 5th tarsomeres in hind leg as 7.5: 2: 1.2: 1: 1. Wing ( Fig. 3c ) 2.6 times as long as wide, subhyaline, marked with two brown bands as follows: median band broad and distinct, extending from basal part of cell r 2+3 to fork of CuA; subapical band extending from R 2 to M 1+2 fork, often separated into three clouds. Veins brown; Sc ending in C not at level of basal 1/3 of R 2+3; Rs straight, as long as r-m. Halter and prehaltere pale yellow with brown hairs.

Abdomen ( Fig. 3a ). First tergum dark brown with anterior margins yellow laterally, 2nd tergum brown with middle area yellow, 3rd and 4th terga yellow with caudal 1/3 brown, 5th and 6th terga dark brown, 7th tergum brown with posterior margin yellow. First sternum yellow brown, 2nd and 3th sterna uniformly yellow, 4th sternum yellow with posterior margin brown, 5th and 6th sternum brown, 7th sternum brown with lateral area yellow. Hairs on abdomen brown.

Male genitalia ( Fig. 4 ) yellow. Epandrium ( Fig. 4b ) bilobed, each lobe strongly elongated and forming a long surstylus, surstylus broadest at base, tapering and curved distally to the middle, slender apically, with brown hairs; proctiger with short hairs. Gonocoxite ( Fig. 4c ) long and stout, 3 times as long as wide, basal apodeme 1/2 as long as gonocoxite; paramere with a pair of slender L-shaped projections. Gonostylus ( Fig. 4c ) with five projections and lobes: a strong retrose basal projection on inner side with uniformly short hairs; a retrose basal projection on dorsal side, broad basally and tapered apically, with short hairs on outer side; a broad tongue-shaped lobe on middle area with short hairs apically; a dumbbell-shaped apical lobe bilobed apically, dorsal lobe hooked with uniformly short hairs, ventral lobe broad with dense short setae apically. Hypandrium ( Fig. 4d ) rectangular, anterior margin concaved medially, posterior margin with a pair of L-shaped projections and a triangular projection, with short hairs basally and dense long hairs posteromedially.Aedeagus ( Fig. 4 e–f): subapical sclerite tongue-shaped, slightly caved bilaterally, apex of subapical sclerite round.

Female. Body length 9.0–10.0 mm, wing length 10.0–11.0 mm. Similar to male. Wing band broader than in male. First tergum brown, 2nd tergum brown with middle area yellow, 3rd tergum yellow with caudal 1/2 brown, 4th and 5th terga brown, 6th tergum brown with caudal 1/2 yellow, 7th tergum yellow. Sterna yellow. Terminalia ( Fig. 3d ): 8th sternum yellow, 2 times as long as 7th sternum; circus yellow with caudal 1/3 brown, blade-shaped, 10th tergum + cercus 1.2 times as long as 8th sternum.

Type material. HOLOTYPE: ♂, CHINA, Sichuan, Leshan, Mt. Emei , Linggongli , 2016.VI.21, Zehui Kang . PARATYPES: 30♂♂ 33♀♀, same data as holotype.

Distribution. China (Sichuan).

Etymology. The species is named after the type locality Mt. Emei.

Remarks. This new species is similar to P. lushuiensis from China, but it can be separated from the latter by the second tergum of abdomen mostly brownish, the projection of epandrium curved ventrally, the lobe on middle area of gonostylus tongue-shaped and the posterior margin of hypandrium with a triangular projection medially. In P. lushuiensis , the second tergum of abdomen is mostly yellowish, the projection of epandrium suddenly bends into a right angle at middle area, the lobe on middle area of gonostylus is digitiform and the posterior margin of hypandrium has a pair of hook-shaped projections medially. The new species is also similar to P. formosensis from China and Japan, but it can be easily separated from the latter by the fifth and sixth terga of abdomen uniformly dark brown, the sixth and seventh sterna of abdomen brown, the dorsal lobe of apical gonostylus hook-shaped and the posterior margin of hypandrium with a pair of L-shaped projections. In P. formosensis , the fifth and sixth terga of abdomen are yellow with posterior margins black, the sixth and seventh sterna of abdomen are yellow, the dorsal lobe of apical gonostylus is digitiform and the posterior margin of hypandrium has a pair of large rounded flap-shaped lobes.

Figures

FIGURE 3. Ptychoptera emeica 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 4. Ptychoptera emeica 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.