Libnotes (Libnotes) jirisana, Podenas, Sigitas, 2016

Podenas, Sigitas, 2016, The crane fly genus Libnotes Westwood, 1876 (Diptera: Limoniidae) for Korea including two new species and an identification key, Zootaxa 4158 (1), pp. 126-136 : 133-135

Libnotes (Libnotes) jirisana n. sp.

Figures 10 •–14

Diagnosis. Small, body length 9–10 mm, if compared with other species of Libnotes (Libnotes) . Dark brown species with intensely darkened wings patterned with three dark spots at frontal margin and darkening along cord and along distal margin of discal cell. Entire pleuron dark brown. Wing with long radial sector. Leg uniformly yellow without any dark rings, only tip of tarsus darkened. Abdomen semi-polished, grayish brown. Male genitalia with large triangle shaped inner gonostylus bearing two long appendages, one of them, rostral appendage long and narrow with strong subbasal spine; inner gonostylus sinuous with hook-shaped tip. Ovipositor with slightly sinuous cercus, having no additional tooth at apex.

Description. General body coloration grayish brown ( Fig. 11 ). Body length of male 9.31 mm, female 10.30 mm. Wing length of male 9.64 mm, that of female 11.10 mm.

Head gray because of dense pruinosity, covered with medium-long brown setae. Dorso ventral area slightly darker than remainder of vertex. Anterior vertex very narrow, area right above bases of antennae light silvery gray. Eyes large, ventrally and dorsally nearly reaching each other. Length of male antennae 2.10 mm, nearly reaching wing base, if bent backwards. Antenna of female ( Fig. 10 ) 2.05 mm long, reaching to about base of wing, if bent backwards. Scape nearly cylindrical, 2.4 times as long as wide, dark brown, except lighter basal part, covered with gray pruinosity. Segment covered with few short delicate setae. Pedicel narrow at base, getting wider distally, twice as short as scape, dark brown and bearing few strong setae. Flagellum 12-segmented, uniformly dark brown. Apical pedicels of flagellomeres very short in female, but rather distinct in male. Eight basal segments oval, decreasing in width towards distal end of antenna, remaining segments elongate. Apical flagellomere 1.2 times as long as preceding segment, uniformly wide along entire length in female, nearly twice as long as preceding segment and slightly widened at about one-third of its length in male. Most verticils shorter than respective segments, just single verticil on dorsal surface distinctly longer, that on 1–3 segments 1.2 times as long as segment itself, longest verticils on segments 4–10 twice as long as respective segment. Verticils dark brown. Whitish pubescence, covering segments dense. Rostrum brown, with blackish dorso-proximal area. Palpus dark brown, short, just slightly exceeding length of rostrum, two basal palpomeres elongate, two terminal segments very short, oval. Palpomeres covered with short, adjacent brown setae. Labella dark brown.

Thorax dark brown, covered with sparse gray pruinosity. Cervical sclerites dark brown. Pronotum large, dark brown, just posterior margin lighter. Mesonotal prescutum dark brown with blackish median stripe. Scutal lobe dark brown. Scutellum dark brown with narrowly yellowish posterior margin. Ground color of mediotergite dark brown, but sclerite looks grayish because of gray pruinosity. Pleuron semi-polished, entirely dark brown, covered with sparse gray pruinosity. Wing ( Fig. 11 ) tinged with blackish. Costal area yellow. Cloudy brownish spots surround base of Rs, distal ends of Sc and R1, at cord and at distal end of discal cell. Veins of costal field yellow, remaining veins grayish to brownish, but dark brown in darkened areas. Venation: Sc long, Sc1 reaching wing margin far beyond branching point of Rs, Sc2 beyond tip of Sc1 tip. Rs medium-long, just slightly arched. Vein R2 transverse, starting at same point as R1. R1 short and oblique. Both branches of Rs long and parallel to each other, distal ends distinctly bent posteriorly. Cross-vein r-m distinct, at base of discal cell. Discal cell very long, slightly widened distally, four times as long as wide. Basal deflection of CuA1 more than twice its own length beyond branching point of M, at about two-fifths of discal cell‘s length. First anal vein nearly straight, second anal vein slightly arched before middle, distal part straight. Anal angle comparatively small, medium-wide. Length of male halter 1.23 mm, that of female 1.24 mm. Stem of halter and basal part of knob yellow, distal part of knob brownish yellow. Fore coxa dark brown proximally and yellow distally, middle coxa grayish brown dorsally and yellow distally, posterior grayish brown, just distal part narrowly yellowish. Distal margin of all trochanters narrowly dark brown. Entire femur yellow without any darker rings. Tibia obscure yellow, just very tip indistinctly brownish. Basal tarsomeres gradually turning from yellow at base of first segment to dark brown at very apex of third segment, fourth and fifth tarsomeres entirely dark brown. Leg covered with short adjacent brown setae. Male femur II: 7.91 mm long, III: 7.96 mm; tibiae II: 8.51 mm, III: 8.75 mm; tarsus II: 7.42 mm, III: 6.39 mm long. Female femur II: 8.65 mm long; tibiae II: 8.60 mm, III: 8.90 mm; tarsus II: 8.55 mm, III: 6.63 mm long. Claw black, with subbasal spine.

Abdominal segments semi-polished. Basal tergite dark brown, remaining tergites grayish-yellowish brown with narrowly yellowish posterior margins. Sternites somewhat lighter, than corresponding tergites, but generally coloration is very similar, just sixth and especially seventh sternites darker. Tergites and sternites covered with short, adjacent yellowish setae. Male genitalia ( Figs. 12, 13 ) with brown gonocoxite and yellowish inner gonostylus. Ninth tergite simple, posterior margin slightly emarginate at middle. Gonocoxite slightly elongate, wider at base, narrower at apex, almost conical, with large elongate, blunt-apexed, setose ventro-mesal lobe. Outer gonostylus narrow, sclerotized, sinuous, distal part hook-shaped. Inner gonostylus very large, distinctly extended posteriorly, covered with strong setae. Rostral prolongation very long and narrow, bearing subbasal strong spine. Second elongate lobe is approximately at middle of gonostylus, bearing four long setae dorsally at base and single setae at apex, which protrudes at right angle to prolongation. Very strong black spine is distally on ventral side of prolongation. Paramere pale, smoothly narrowing towards distal end, very tip blackened. Penis wide at base, getting narrower distally, elongate, tip with two rounded lobes. Ninth sternite simple. Ovipositor ( Fig. 14 ) brown with dark brown markings at base of cercus and hypogynial valve. Cercus slightly sinuous, without subapical tooth. Hypogynial valve wedge-shaped, wide at base, turning distinctly narrower toward acute tip; long, nearly reaching tip of cercus.

Elevation range. Both specimens were collected at about 450 m altitude.

Period of activity. Adults are flying only at the beginning of July.

Habitat. Forest covered steep slopes of mountainous stream. Despite crane flies intensely collected with net and at light for nine days in the area, adults of Libnotes jirisana n. sp. were captured only at light.

Examined material.

Holotype, male (in ethanol), South Korea, Jeollanam-do, Gurye-gun, Toji-myeon, Naeseo-ri , Piagol valley , N35.26590, E127.58096, alt. 446 m, 2015.07.0 2 (4), V. Podeniene, at light.

Paratype, Female (pinned). South Korea, Jeollanam-do, Gurye-gun, Toji-myeon , Naeseo-ri , Piagol valley , N35.26590, E127.58096, alt. 446 m, 2015.07.0 1 (3), S. Podenas, at light.

Etymology. Species is named after Jiri mountains (Jirisan in Korean), where it was collected.

Discussion. Because of the dark coloration, L. jirisana n. sp. differs from all Korean Libnotes (Libnotes) and most other species, belonging to that subgenus, and more resembles the darkly colored Libnotes (Afrolimonia) . Identification key for Chinese Libnotes ( Men, 2015) can not be used for L. jirisana n. sp. from the very beginning, because no Chinese species has a uniformly darkened pleuron, at most with blackened or infuscated areas. L. jirisana n. sp. has an unusually long (for subgenus) radial sector of wing, thus it more resembles that of Afrolimonia . Other features, like the long vein Sc, the distal position of basal deflection of CuA1, and the strongly arched distal veins clearly show that this species belongs to the nominate subgenus. The only regional dark colored species comparable with L. jirisana n. sp. is L. undulata Matsumura, 1916 , but it has a pleuron patterned with lighter areas, the radial sector is very short, the position of R2 is basal to he apex of R1, when these veins are at same level in Libnotes jirisana n. sp. Distinctly shaped inner gonostylus of L. jirisana n. sp. resembles that of L. amatrix ( Alexander, 1922) , but it has distinctly longer lobe at the middle of the gonostylus, and a more extended distal part of the gonostylus in L. jirisana n. sp. In general, because of the wing venation, the structure of the male genitalia, the cercus of the ovipositor and body coloration, L. jirisana n. sp. is unique among all Libnotes s. str.

Figures

FIGURES 10 – 14. Libnotes (Libnotes) jirisana n. sp. 10: Antenna of female; 11: General view of female, lateral view; 12: Male genitalia, dorsal view; 13. Male genitalia, ventral view; 14: Ovipositor, lateral view.