Prionolabis yankovskyana ( Alexander, 1940 )

Podenas, Sigitas, Park, Sun-Jae & Aukštikalnienė, Hye-Woo Byun and Rasa, 2022, Prionolabis crane flies (Diptera: Limoniidae) of Korea, Journal of Species Research 11 (1), pp. 29-37 : 35-36

Prionolabis yankovskyana ( Alexander, 1940)

Limnophila yankovskyana Alexander, 1940: 50 Prionolabis clavaria Savchenko, 1983: 57 ; 1989: 114;

Oosterbroek, 2021.

General: Body coloration polished black. Body length of male 6.5-7.0 mm, wing length 7.2-8.0 mm.

Head: Black, pruinose. Distance between eyes in male right above antennae approximately three times exceeds width of scape. Vertical tubercle low. Male antenna black, 6.0- 6.2 mm long, nearly as long as the entire body. Flagellum 14-segmented, flagellomeres elongate, cylindrical, decreasing in length towards apex, apical segment only about one third as long as penultimate. Flagellum covered with abundant erect setae with verticils just slightly exceeding their length. Rostrum and palpus black.

Thorax: Polished black. Mesonotal prescutum covered with short setae, longitudinal stripes missing. Male wing ( Fig. 5A ) translucent, with brownish tinge, yellowish at base and costal area, weakly darkened along cord, Rs, distal margin of discal cell, along veins CuA and A 1, and along distal wing margin. Stigma oval, light brown. Veins brown, yellowish at wing base and in costal area. Venation: Sc long, reaching wing margin slightly before branching point of Rs, sc-r short distance before tip of Sc. Rs long, arched at base. Free end of R 1 short, just slightly longer than R 2. R 3 and R 4 diverging towards wing margin, R 4 and R 5 also slightly diverging towards wing margin. Cell r 3 without stem. Discal cell 1.7 times as long as wide. Cell m 1 missing, cross-vein m-m nearly missing, thus veins M 1 + 2 and M 3 reaching each other. Cross-vein m-cu slightly before midlength of discal cell. CuA distinctly arched before wing margin, CuP nearly straight, anal vein slightly sinuous, reaching wing margin slightly before level of Rs base. Anal angle long and wide, posterior margin widely rounded. Stem of halter pale, knob brownish. Coxa black, trochanter dark brown to black, femur black with narrowly pale base, tibia brown with blackened apex, tarsus black.

Abdomen: Polished black. Ninth tergite of male genitalia ( Fig. 5B ) wider than longer, posterior margin with wide and shallow notch. Gonocoxite elongate, twice as long as wide, simple, without additional lobes. Outer gonostylus sclerotized, bifid, both branches long and narrow, point-apexed, inner branch twice as long as out- er. Inner gonostylus fleshy and setose, triangle-shaped. Paramere shaped as long parallel-sided plate. Aedeagus long, wide at base, distal part narrow, rod-shaped.

Female: unknown.

Elevation range in Korea: Altitudes from slightly above 700 m to more than 1,500 m.

Period of activity in Korea: Adults are active and flying for only about three weeks starting from the beginning of July in Korea, their flight starts later and lasts for about ten days longer in the Far East of Russia close to the border with Korea ( Savchenko, 1983).

Habitats: Unknown.

General distribution: North Korea and southeastern corner of the Far East of Russia, close to the border with North Korea.

Examined material ( Fig. 6D ): paratype (topotypic) (as Limnophila yankovskiana ), male (antenna, wing, fore and hind legs, genitalia slide mounted), North Korea, Seren Mts., alt. 5,000 ft. [1,524 m], July 10, 1938, A. M. Yankovsky (USNM); paratype (as Limnophila yankovskyana ), male (antenna, wing, leg and genitalia slide mounted), North Korea, Seren Mts., alt. 3,500 ft. [1,067 m], July 19, 1938, A. M. Yankovsky (USNM).

Figures

Fig. 5. Prionolabis yankovskyana (Alexander, 1940), male. A. wing. B. male genitalia slide-mounted, dorsal view, paratype. Scale bars: 1.0 mm (A), 0.5 mm (B).

Fig. 6. Distribution maps of Korean Prionolabis. A. P. acanthophora. B. P. clavaria. C. P. dis. D. P. yankovskyana.