Prionolabis clavaria ( 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 : 33-34

Prionolabis clavaria ( Alexander, 1950)

Limnophila (Prionolabis) clavaria Alexander, 1950: 429

Prionolabis clavaria Savchenko & Krivolutskaya, 1976: 70 ; Savchenko, 1989: 113; Oosterbroek, 2021.

General: Body coloration dark brown to black. Male body length 8.5 mm, wing length 8.8 mm.

Head: Dark brown, sparsely dusted with brownish, covered with blackish to yellowish setae, longer laterally, shorter dorsally. Distance between eyes in male approximately equals to the length of scape. Male antenna ( Fig. 3A ) 1.6 mm long, reaching frontal margin of prescutum if bent backwards. Scape elongate, nearly cylindrical, 1.6 times as long as pedicel, dark brown at base, black at apex, dusted with brownish gray and bearing few black semi-adjacent setae. Pedicel widening towards distal end, black, covered with black setae. Flagellum 14-segmented, entirely black. Basal flagel- lomere slightly elongate, less than twice as long as wide, 2-5 flagellomeres oval, distal flagellomeres slightly elongate, apical segment 1.3 times as long as preceding. Longest verticils up to 1.7 times as long as respective segment. Rostrum, palpus and mouth parts black, dusted

C D

with brownish gray.

Thorax: Cervical sclerites, pronotum and mesonotal prescutum black, covered with brownish pruinosity and erect blackish to yellowish setae. Longitudinal stripes on mesonotum missing. Tubercular pits missing, pseudosutural fovea indistinct, wide and shallow. Scutal lobe black, pruinosity scarcer than on prescutum. Area between scutal lobes black and densely dusted. Scutellum black with dark reddish brown posterior apex. Mediotergite dark brown to black, sparsely pruinose. Pleuron black, more heavily dusted ventrally, sparsely variegated with semi-polished areas where the bloom has been denuded, katepisternum setoseless. Male wing ( Fig. 3B ) slightly iridescent, translucent, with brownish tinge, yellowish at base and costal area, without any darker spots except brown oval stigma. Veins brown, yellowish at wing base and in costal area. Venation: Sc long, reaching wing margin at branching point of Rs, sc-r at tip of Sc. Rs long, angulate 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 nearly parallel to each other. Cell r 3 with short stem which approximately equals length of m-cu. Discal cell twice as long as wide. Stem of cell m 1 just slightly exceeds length of cell itself. Cross-vein m-cu at about middle of discal cell. CuA slightly 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. Calypter without setae. Length of male halter 1.4-1.7 mm. Stem of halter pale, widely rusty brown at base, knob brownish with pale base. Coxae black, densely dusted brownish gray, covered with long blackish to yellowish setae. Meron small, thus second and third pairs of coxae close to each other. Trochanters black, just posterior narrowly rusty brown ventrally. Femur dark brown, narrowly pale at base, black at apex. Tibia dark brown with black apex. Tarsus dark brown turning black towards distal end. Male femur I: 4.7-5.0 mm long, II: 5.0 mm, III: 5.5-6.0 mm, tibia I: 5.5-5.8 mm, II: 5.5 mm, III: 6.5 mm, tarsus I: 6.2-6.7 mm, II: 6.5 mm, III: 6.2 mm. Claw short and simple, without spines, brown with black apex. Arolium reaching to about middle of claw.

Abdomen: Very dark brown, nearly black, dusted with brown pollen. Erect setae covering abdominal sclerites blackish at base, pale at distal end. Paired transverse sutures on tergites black but narrow. Male terminalia ( Fig. 3C, 3D ) concolorous with the rest of abdomen. Ninth tergite wider than longer, posterior margin with U-shaped medial notch and blunt apexed lobules on both sides of it. Gonocoxite slightly elongate, 1.7 times as long as width at base, simple, without additional lobes. Outer gonostylus sclerotized, narrows distally, apex curved and hook-shaped, additional fleshy and setose lobe starting at base of dorsal surface and reaching to about two-thirds of gonostylus. Inner gonostylus elongate, sclerotized with bifid tip, outer branch longer with setose apex, inner branch rounded. Paramere long and narrow with needle-like apex that is turned downwards at a straight angle; very apex usually not visible in exactly dorsal view, thus in slide-mounted specimens only preapical part, that is rounded or with small apical notch, is visible. Aedeagus very long, narrows towards distal end, that is curved downwards.

Female: unknown.

Elevation range in Korea: Altitudes from more than 1,100 m to more than 1,800 m.

Period of activity in Korea: Adults are active and flying from late June through middle of July.

Habitats: Unknown in Korea, margins of streams in the Far East of Russia ( Savchenko, 1983).

General distribution: Eastern Kazakhstan, North Korea, distribution in the Far East of Russia needs confir- mation.

Examined material ( Fig. 6B ): holotype (as Limnophila (Prionolabis) clavaria ), male (antenna, wing, hind leg and genitalia slide mounted), North Korea, Kankyo Nando , Puksu Pyaksan, Toorisani, alt. 6,000 ft. [1,829 m], June 22, 1939, A. M. Yankovsky ( USNM); 2 males (pinned) , North Korea, Seren Mts. , alt. 3,800 ft. [1,158 m], July 10, 1938, A. M. Yankovsky ( USNM) .

Figures

Fig. 3. Prionolabis clavaria (Alexander, 1950), male. A. antenna. B. wing. C. male genitalia in glycerol, dorsal view. D. male geni- talia slide-mounted, dorsal view, holotype. Scale bars: 0.5 mm (A, C, D), 1.0 mm (B).

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