Geranomyia semjina, Podenas, Sigitas, 2016

Podenas, Sigitas, 2016, New Geranomyia crane flies (Diptera: Limoniidae) from Korea and Kunashir Island, Zootaxa 4121 (5), pp. 555-565 : 556-557

Geranomyia semjina n. sp.

Figures 1–6

Etymology. Species is named after the name of the river Seomjin-gang, where it was collected for the first time ( Fig. 16 ).

Material examined. Type specimens, Holotype, two paratypes, all males.

Holotype, male (pinned). SOUTH KOREA, Jeollanam-do, Gurye-gun, Toji-myeon, Naeseo-ri, Jirisan National Park, Piagol valley, N35.26590, E127.58096, alt. 446 m, 2015.07.0 1 (3), coll. S. Podenas, at light.

Paratypes: male (preserved in ethanol, wing slide-mounted, genitalia in microvial filled with glycerol and pinned). SOUTH KOREA, Gyeongsangnam-do province, Hadong, Seomjin-gang (river), N35.06170, E127.74463, alt. 33 m, 2012.04.27, coll. S. Podenas; male (preserved in ethanol, genitalia in microvial filled with glycerol and pinned). SOUTH KOREA, Jeollanam-do, Gurye-gun, Toji-myeon, Naeseo-ri, Jirisan National Park, Piagol valley, N35.26590, E127.58096, alt. 446 m, 2015.06.28 (3), coll. S. Podenas, at light.

Diagnosis. Distinguished from other species in the genus by male genitalia. Inner gonostylus has big rostral prolongation, that bears two long spines, the longest starts from large tubercle, base of which is so wide, that nearly covers whole length of rostral prolongation, shorter spine starts from separate smaller tubercle. Penis simple, elongate. Wing unpatterned, except distinct oval stigma. Radial sector of wing nearly straight, vein r-m very short, nearly missing.

Description ( Figs. 1–6 ). Adult, male (N =3). Body dorsally dark brown, ventrally yellowish brown ( Fig. 1 ). Body length 6.3–9.3 mm. Wing length 6.7–8.2 mm. Head: dorsally dark brown, posterior margin narrowly yellowish, covered with scarce erect brown setae. Vertex medium wide, wider than length of antennal pedicel, narrower than length of scape. Head ventrally yellow. Length of antenna 1.20–1.35 mm. Scape cylindrical, brown, dorsally bearing few short erect dark setae. Pedicel rounded, same color as scape, dorsally bearing few short erect dark setae. Flagellum 12-segmented, brown. All flagellomeres oval and similar in length, apical flagellomere distinctly shorter than preceding segment. Verticils very short, distinctly shorter than respective segments. Very short dark brown pubescence, covering segments. Rostrum brown dorsally, yellowish brown laterally, pale ventrally, reaching approximately to middle of second flagellar segment. Mouth parts grayish brown, covered with short erect brownish setae. Rostrum with mouth parts 2.9 mm long. Palpus two-segmented. Basal segment yellow, long, narrow, distal end slightly widened, darkened. Distal segment wider than preceding, distinctly shorter, elongate-oval, slightly arched, blackish, covered with erect blackish setae. Thorax: yellowish brown. Cervical sclerite blackened. Pronotum dark brown dorsally, yellowish laterally. Ground color of mesonotal prescutum yellowish brown, three distinct brown longitudinal stripes confluent posteriorly. Frontally prescutal stripes dark brown. Pseudosutural fovea yellowish brown. Scutal lobes brown, posteriorly yellowish. Scutellum brown with narrow yellowish median line, laterally and posteriorly pale. Mediotergite brown with narrow yellowish median line, not reach posterior margin. Pleuron yellowish, with brownish katepisternum and small dark brown spot behind prothoracical spiracle. Wing ( Fig. 2 ) brownish, subcostal cell yellowish. Stigma distinct, brown, ovalshaped. Most veins brown, veins at wing base pale. Venation: Sc1 long, reaching approximately to middle of Rs, Sc2 slightly before Sc1 tip. Rs nearly straight, slightly arched at base. Both branches of Rs nearly parallel to each other, slightly diverging at wing margin. Vein r-m very short, R4+5 nearly reaches M1. Discal cell comparatively wide, slightly more than twice as long as wide. Free end of M1+2 1.2 times as long as its basal part forming frontal margin of discal cell. Basal deflection of CuA1 at branching point of M. Both anal veins long, A1 nearly straight, A2 slightly sinuous. Anal angle medium-sized, posterior margin widely rounded. Halter 0.8–1.0 mm long, pale, knob slightly infuscated. Coxae brownish at base, yellow distally. Trochanters yellow, distal margin narrowly rimmed with black. Femur with swollen distal part, yellow with narrowly pale base and subterminal brown ring, apex yellow. Tibia yellowish brown with darkened distal end. Basal tarsomere yellowish brown at base, brown distally. Distal tarsomeres dark brown. Leg covered with short, dense black setae. Femur I: 5.1–5.5 mm, III: 6.0– 6.8 mm; tibiae I: 6.1–7.1 mm, II: 5.8 mm, III: 6.3–6.9 mm; tarsus I: 4.8–5.1 mm, III: 3.8–4.4 mm. Abdomen: tergites brown, laterally and posteriorly yellowish. Distal tergites dark brown. Sternites uniformly yellow. Lateral membrane between tergite and sternite blackish. Male terminalia ( Figs. 3, 4 ) with dark brown ninth tergite and gonocoxite, inner gonostylus light brown. Posterior margin of ninth tergite widely concave, lateral parts slightly raised, covered with dense short brown setae. Gonocoxite elongate, bearing large ventro-mesal lobe ( Fig. 5 ). Distal part of lobe oval, covered with long erect setae. Outer gonostylus strongly sclerotized, darkened, long, narrow, distinctly arched. Inner gonostylus egg-shaped, slightly shorter than gonocoxite, with large rostral prolongation, with large tubercle on posterior margin. Basal part of tubercle nearly covered whole length of rostral prolongation. Tubercle ending with long and slightly arched apical spine. Another straight, somewhat shorter spine at separate smaller tubercle at base of large one. Both spines at nearly right angle to each other, thus, when vieved directly from above ( Fig. 3 ), dorsal spine looks distinctly shorter than caudal, but they look nearly similar, when pressed under the cover glass in slide-mounted specimen ( Fig. 4 ). Tip of rostral prolongation slightly curved frontally and covered with small setae. Paramere wide at base, distal part extended into narrow lobe. Penis ( Fig. 6 ) long and narrow, distal end slightly curved downwards.

Female unknown.

Habitats. Holotype and one paratype were captured at light on margin of medium-sized mountainous stream with springs on slopes, covered by mixed forest ( Fig. 17 ). One paratype was collected by net at urbanized margin of large river. It was flying close to small drainage water pipe. Same location was visited twice in 2015, but river slope was improved ( Fig. 16 ), leaking water pipes covered with concrete and species was not found again.

Elevation. Altitudes from 30 to 450 m.

Period of activity. From end of April through beginning of July.

Distribution. Southern part of South Korea.

Discussion. Geranomyia semjina n. sp. has very distinct male genitalia, especially the inner gonostylus with two large spines on rostral prolongation. Typically species of Geranomyia have two closely positioned on same tubercle on rostral prolongation, some species with single long, curved spine. In G. semjina n. sp. both spines situated separately, the longest spine originated from large tubercle. In this respect, the male genitalia G. semjina n. sp. are different from that of all other Palearctic and Oriental Geranomyia . From other East-Palearctic species G. semjina n. sp. are separated by body coloration, wing pattern, and the details of the wing venation. These features are of secondary importance however; compare to the delineation in the range of variation within this species. More specimens need to be collected and studied in order to fully understand this species.

Figures

FIGURES 1 – 6. Geranomyia semjina n. sp. 1: General view of paratype from Piagol valley; 2: Wing; 3: Male genitalia of paratype from Hadong, postero-dorsal view; 4: Male genitalia of paratype from Piagol valley, dorsal view; 5: Gonocoxite with ventro-mesal lobe, ventral view; 6: Penis, lateral view. Abbreviations: arc, arculus; d, discal cell; gonx, gonocoxite; h, humeral vein; i gonst, inner gonostylus; p, penis; pm, paramere; o gonst, outer gonostylus; rost, rostral prolongation of inner gonostylus; tg 9, ninth tergite.

FIGURES 16 – 17. Collecting localities of Geranomyia in South Korea. 16: Seomjin-gang (river) margin at Hadong, where first specimen of G. semjina n. sp. was collected in 2012; 17: Type locality of G. piagola n. sp. and G. semjina n. sp., Piagol valley, Jirisan National Park.