Ptychoptera circinans, 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 : 462-465

Ptychoptera circinans sp. nov.

( Figs. 5–6 )

Diagnosis. Wing marked with two distinct brown bands. Abdomen with five obvious yellow bands. Epandrium yellow with caudal 1/2 brownish. Gonostylus slender and digitiform, tapered apically, with the following projections and lobes: a dumbbell-shaped basal projection on dorsal side with several hairs apically, a broad basal lobe on dorsal side with dense setae apically, a small digitiform projection dorsally on middle area with dense short hairs apically.

Description. Male. Body length 8.0 mm, wing length 8.5 mm.

Vertex and frons dark brown with brown hairs; face and clypeus yellow with light brown hairs; gena yellow with a black elliptical spot medially, hairs dark brown; occiput yellow. Compound eyes black without pubescence. Antenna brown with scape, pedicel and basal 2/3 of 1st flagellomere yellow. Hairs on antenna dark brown. Proboscis yellow with brown hairs. Palpus yellow with terminal of last segment brown, hairs brown.

Thorax ( Fig. 5 a–b). Pronotum and propleuron yellow. Prescutum, scutum and paratergite uniformly black. Scutellum mostly dark brown, middle area yellow with a patch of dense dark brown hairs. Postnotum dark brown, middle area with a yellowish brown strip. Laterotergite dark brown with patch of dense dark brown hairs. Episternum brown with upper 2/3 of anepisternum yellow, anepimeron uniformly brown, katepimeron yellow with lower 1/3 gradually darked. Metapleuron yellow. Coxae mostly yellow, except posterior margin of hind coxa light brown; trochanters yellow brown; fore femur yellow and gradually darkened apically; mid and hind femora yellow with a narrow brown ring apically; tibiae yellow brown with a narrow dark brown ring apically; 1st tarsomere of fore and mid legs brown, 1st tarsomere of hind leg yellow with a narrow dark brown ring apically, other tarsomeres dark brown. Hairs on legs dark brown. Relative length of 1st to 5th tarsomeres in hind leg as 9.3: 2.5: 1.5: 1.2: 1. Wing ( Fig. 5c ) 3.8 times as long as wide, subhyaline, marked with two brown bands as follows: median band extending from basal of Rs to middle section of CuA; subapical band broadest along anterior margin of wing, covering pterostigma and extending to tip of M 2. 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. 5a ). First tergum dark brown with basal 1/3 brown, 2nd tergum brown with anterior margin and middle area yellow, 3rd tergum yellow with caudal 1/5 brown, 4th tergum yellow with caudal 1/3 brown, 5th to 7th terga brown. Sterna yellow. Hairs on abdomen brown.

Male genitalia ( Fig. 6 ) yellow with caudal 1/2 of epandrium brown. Epandrium ( Fig. 6b ) bilobed, each lobe strongly elongated and forming a long surstylus, surstylus broadest at base, tapering distally and curved downward, slightly swollen at tip, with brown hairs; proctiger with short hairs. Gonocoxite ( Fig. 6c ) short and slender, 2.4 times as long as wide, basal apodeme 1/2 as long as gonocoxite; paramere with two pairs of projections, outer projections hook-shaped with several long hairs apically, inner projections conical. Gonostylus ( Fig. 6c ) slender and digitiform, tapered apically, with the following projections and lobes: a dumbbell-shaped basal projection on dorsal side with several hairs apically, a broad basal lobe on dorsal side with dense setae apically, a small digitiform dorsal projection on middle area with dense short hairs apically. Hypandrium ( Fig. 6d ) transverse and trapeziform with several long hairs posterolaterally, posterior margin with two pairs of digitiform projections laterally and one digitiform projection medially, outer pair of projections large with dense long hairs, inner pair of projections small with short hairs. Aedeagus ( Fig. 6 e–f): subapical sclerite triangle, apex of subapical sclerite round.

Female. Body length 9.0–10.0 mm, wing length 9.0– 10.5 mm. Similar to male. Sixth and 7th terga brown with posterior margins yellow; 8th tergum yellow. Fourth to 7th sterna yellow with posterior margins brown. Terminalia ( Fig. 5d ): 8th sternum yellow, 1.2 times as long as 7th sternum; cercus yellow with black margin, blade-shaped, 10th tergum + cercus 1.2 times as long as 8th sternum.

Type material. HOLOTYPE: ♂, CHINA, Fujian, Jianning, Minjiangyuan National Nature Reserve, Yingtaoling (950 m), 2015.III, Malaise trap . PARATYPES: 4♀♀, same data as holotype ; 2♀♀, CHINA, Fujian, Dehua, Mt. Daiyun, Houzhai , 2015.IV–VIII, Malaise trap .

Distribution. China (Fujian).

Etymology. The specific name refers to the yellow bands in abdomen.

Remarks. This new species resembles somewhat P. bannaensis from China in having the similar wing spots and venation, but it can be easily separated from the latter by the mesopleuron mostly brown and the epandrium yellow with caudal 1/2 brown. In P. bannaensis , the mesopleuron is uniformly yellow and the epandrium is uniformly yellow.

Figures

FIGURE 5. Ptychoptera circinans 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 6. Ptychoptera circinans 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.