Dactylolabis (Dactylolabis) wudangensis, Gao & Zhang & Yang, 2021

Gao, Shang, Zhang, Bing & Yang, Ding, 2021, A new species of Dactylolabis subgenus Dactylolabis Osten Sacken, 1860 from China (Diptera, Limoniidae), ZooKeys 1047, pp. 91-100 : 91

Dactylolabis (Dactylolabis) wudangensis sp. nov.

Figs 11-17 , 18-21

Diagnosis.

Cell r1 relatively broad at pterostigma. Vein R3 shorter than vein R2+3. Vein R4 relatively curved at tip. Vein M1 about twice as long as vein M1+2. Crossvein m-cu located at 1/5 of cell dm. Posterior margin of 9t with an M-shaped process and a deep V-shaped notch at middle. Inner gonostylus stubbier than outer gonostylus, curved. Gonocoxite rather short, as long as outer gonostylus. Aedeagus very big, with an elongated tip at posterior margin.

Description.

Male (n = 3). Body length 7.2-10.1 mm, wing length 14.2-18.8 mm, antenna length 2.2-2.4 mm.

Head (Figs 11 , 12 ) dark brown with gray pollen. Rostrum and palpus brown. Antenna brown.

Thorax (Figs 11 , 12 ) mostly dark brown with gray pollen. Pronotum rather long; mesonotum brownish, prescutum brown with four dark brown stripes. Thoracic pleuron mostly dark brown with pale gray pollen. Legs: base of coxae brown, tip of coxae and trochanters brownish-yellow; femora more yellow at base, brown at tip; tibiae and tarsi brown. Wing (Figs 11 , 17 ) yellowish hyaline, pterostigma more brownish, and with brownish markings near base of wing, origin of Rs, around crossvein sc-r and vein R2, base of vein R4, crossveins r-m and m-m, crossvein m-cu, and vein CuA; veins brown. Venation: cell r1 relatively broad at pterostigma; Rs long; R2 relatively straight; R3 shorter than R2+3; R4 relatively curved at tip; R5 relatively straight; M1 about twice as long as M1+2; m-cu located at 1/5 of cell dm. Halter (Figs 11 , 12 ) approximately 2.2 mm long, stem yellowish, rest gray.

Abdomen (Fig. 11 ) mostly dark brown with brownish-yellow setae.

Hypopygium (Figs 11 , 18-21 ) brown with brownish setae. Surface of 9t with numerous long setae, posterior margin with an M-shaped process, with a deep V-shaped notch at middle; outer gonostylus cylindrical; inner gonostylus stubby, curved; gonocoxite rather short, as long as outer gonostylus; aedeagus hyaline, very big, with an elongated tip at posterior margin.

Female (n = 1). Similar to male. Body length 8.6 mm, wing length 13.5 mm, antenna length 2.3 mm.

Ovipositor (Figs 13-16 ) brown with yellow setae. Cercus reddish-brown, broadened at base. Hypogynial valve yellow, narrowed toward tip, longer than cercus.

Type material.

Holotype: male (CAU), China: Hubei, Danjiangkou, Wudang Mountain, 1600 m, 1984.VI.31, Jikun Yang. Paratypes: 2 males, 1 female (CAU), China: Hubei, Danjiangkou, Wudang Mountain, 1600 m, 1984.VI.31, Jikun Yang.

Distribution.

China (Hubei).

Etymology.

The species is named after the type locality, Wudang Mountain.

Remarks.

The new species is somewhat similar to D. (D.) mokanica Alexander, 1940 from China (Zhejiang), but can be separated from the latter by crossvein sc-r slightly longer than crossvein R1, m-cu located at 1/5 of cell dm, and tips of veins A1 and CuA without brownish markings (Figs 11 , 17 ). In D. (D.) mokanica , crossvein sc-r is shorter than vein R1, crossvein m-cu is located at 1/3 of cell dm, and the tips of veins A1 and CuA have brownish markings (Fig. 10 ; Alexander 1940: p. 22, fig. 12). The new species is somewhat similar to D. (D.) dilatata (Loew, 1856) from the West Palearctic and D. (D.) subdilatata Starý, 1969 from Czechia in having similar wing markings and venation, but can be separated from the latter two species by posterior margin of 9t with an M-shaped process and cercus shorter than hypogynial valve (Figs 13-16 , 18 , 19 ). In D. (D.) dilatata and D. (D.) subdilatata , the posterior margin of 9t lacks an M-shaped process and the cercus is longer than the hypogynial valve (Stary 1969: p. 125, figs 1, 4, 5, 8). The new species is somewhat similar to D. (D.) dilatatoides Savchenko, 1978 from Kazakhstan in having similar wing markings, but can be separated from the latter by vein R2+3+4 as long as vein R2, and posterior margin of 9t with an M-shaped process (Figs 11 , 17 - 19 ). In D. (D.) dilatatoides , vein R2+3+4 is almost absent and the posterior margin of 9t has a deep V-shaped notch ( Savchenko 1978: p. 1176, fig. 1; p. 1177, fig. 3). The new species is somewhat similar to D. (D.) laticellula Savchenko, 1978 from Russia in having similar wing venation, but can be separated from the latter by wing with brownish markings and posterior margin of 9t with an M-shaped process (Figs 11 , 17 - 19 ). In D. (D.) laticellula , the wing has no markings and the posterior margin of 9t lacks an M-shaped process ( Savchenko 1978: p. 1176, fig. 2; p. 1177, fig. 4).

Figures

Figures 11 - 17. Dactylolabis (Dactylolabis) wudangensis sp. nov. 11 male habitus, lateral view 12 male head and thorax, dorsal view 13 female habitus, lateral view 14 ovipositor, dorsal view 15 ovipositor, lateral view 16 ovipositor, ventral view 17 male right wing. Scale bars: 1 mm.

Figures 18 - 21. Dactylolabis (Dactylolabis) wudangensis sp. nov., male 18 hypopygium, dorsal view 19 hypopygium, ventral view 20 aedeagal complex, dorsal view 21 aedeagal complex, ventral view. Scale bars: 1 mm (18, 19); 0.5 mm (20, 21).

Figures 8 - 10. Dactylolabis (Dactylolabis) mokanica Alexander, 1940, male 8 habitus, lateral view 9 head and thorax, dorsal view 10 left wing.