Prionolabis dis ( Alexander, 1950 )

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 : 34-35

Prionolabis dis ( Alexander, 1950)

Limnophila dis Alexander, 1950: 430 .

Prionolabis dis Oosterbroek, 2021 .

General: Body coloration black. Body length of male 6.0- 6.5 mm, wing length 6.9-8.0 mm.

Head: Black, pruinose. Male antenna ( Fig. 4A ) 4.2- 4.5 mm long, reaching to about middle of abdomen, if bent backwards. Both basal antennomeres black. Flagellum 13-segmented, dark brown, flagellomeres elongate, cylindrical, decreasing in length towards apex, apical segment 1.4 times as long as penultimate. Flagellum covered with abundant erect pubescence. Longest verticils reaching to about one-third length of respective segment. Rostrum and palpus black.

Thorax: Black, sparsely pruinose. Mesonotal prescutum black, pruinose, longitudinal stripes missing. Pleuron uniformly black, densely dusted with brownish gray. Male wing ( Fig. 4B ) translucent, with dark brown tinge, darker in costal area, weakly darkened along cord, Rs, distal margin of discal cell, along veins CuA and A 1. Stigma oval, light brown. Veins brown. Venation: Sc long, reaching wing margin at branching point of Rs, sc-r its own length

C

before tip of Sc. Rs long, angulate and short spurred at base. Free end of R 1 elongate, R 2 indistinct, nearly missing. 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, starting before basal deflection of R 5. Discal cell 1.8 times as long as wide. Cell m 1 missing. Cross-vein m-m short but distinct, thus veins M 1+ 2 and M 3 separat- ed at base. Cross-vein m-cu at about mid-length of discal cell. CuA and CuP slightly arched before wing margin, anal vein slightly sinuous, reaching wing margin before level of Rs base. Anal angle long and wide, posterior margin widely rounded. Whole halter darkened except paler base of stem. Coxa black, sparsely pruinose, trochanter dark brown to black, femur black, tibia and basal tarsomere dark brown with blackened apices, remainder of tarsus black.

Abdomen: Black. Male terminalia ( Fig. 4C ) concolorous with the rest of abdomen. Posterior margin of ninth tergite with shallow notch. Gonocoxite elongate, 1.7 times as long as wide, simple, without additional lobes. Outer gonostylus sclerotized, long and narrow with small subapical tooth medially. Inner gonostylus simple, short fleshy and setose, blunt-apexed. Paramere shaped as long flat plate narrowing towards rounded apex. Aedeagus long, wide at base, distal part narrow, rod-shaped.

Female: unknown.

Elevation range in Korea: All specimens collected at nearly 1,700 m altitude.

Period of activity in Korea: Adults are active and flying in mid-June.

Habitats: Unknown.

General distribution: Endemic to North Korea.

Examined material ( Fig. 6C ): holotype (as Limnophila dis ), male (antenna, wing, legs and genitalia slide mounted), North Korea, Kankyo Nando, Puksu Pyaksan, alt. 5,500 ft. [1,676 m], June 13, 1939, A. M. Yankovsky ( USNM) .

Figures

Fig. 4. Prionolabis dis (Alexander, 1950), male. A. antenna. B. wing. C. aedeagus, gonocoxite and gonostyli of male genitalia, slide-mounted, dorsal view, holotype. Scale bars: 1.0 mm (A, B), 0.5 mm (C).

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