Adelphomyia macrotrichiata ( Alexander, 1923 )

Podenas, Sigitas, Park, Sun-Jae & Bae, Changhwan, 2024, Adelphomyia crane flies (Diptera, Limoniidae) of Korea with identification key for all Palaearctic species, ZooKeys 1217, pp. 47-78 : 47-78

Adelphomyia macrotrichiata ( Alexander, 1923)

Figs 22 , 23

Limnophila (Lasiomastix) macrotrichiata Alexander, 1923: 65–66.

Limnophila (Adelphomyia) macrotrichiata : Alexander 1940 a: 49, 75, pl. 1, fig. 7.

Adelphomyia macrotrichiata : Savchenko 1983: 52–53; Oosterbroek 2024.

Type material examined.

Japan • Holotype ♂; wing and genitalia slide-mounted; Hokkaido, Teshio ; 3 July 1916; T. Issiki leg.; USNM .

Other examined material.

(all these specimens are A. punctum but misidentified as A. macrotrichiata ). North Korea • 1 ♂ (wing and genitalia slide-mounted); Ompo ; alt. 37 m; 15 June 1937; A. M. Yankovsky leg.; C. P. Alexander det.; USNM • 1 ♀ (pinned); Ompo ; alt. 61 m; 20 May 1938; A. M. Yankovsky leg.; C. P. Alexander det.; USNM • 1 ♀ (pinned); Ompo ; alt. 61 m; 24 May 1938; A. M. Yankovsky leg.; C. P. Alexander det.; USNM • 1 ex. (pinned, wing and tip of abdomen missing); Ompo ; alt. 61 m; 28 May 1938; A. M. Yankovsky leg.; C. P. Alexander det.; USNM • 1 ♂ (pinned); Ompo ; alt. 152 m; 28 May 1938; A. M. Yankovsky leg.; C. P. Alexander det.; USNM • 1 ♂ (pinned); Ompo ; alt. 91 m; 29 May 1938; A. M. Yankovsky leg.; C. P. Alexander det.; USNM • 2 ♀ (pinned); Ompo ; alt. 122 m; 29 May 1938; A. M. Yankovsky leg.; C. P. Alexander det.; USNM .

Redescription.

Body semi-polished brownish yellow with darker abdomen. Male body length 5.5–6.8 mm, female 7.7–9.2 mm, male wing length 6.2–9.1 mm, female 7.6–8.5 mm.

Head. Pale bluish grey because of dense pruinosity, covered with long, semi-erect, brownish yellow setae. Eyes widely separated in both sexes, distance between eyes at base of antenna exceeds length of scape. Antenna rather long, approximately reaching to base of halter if bent backwards. Male antenna 1.4 mm long, that of female 1.1–1.6 mm. Scape elongate, nearly cylindrical, obscure yellow, turning brownish towards apex, covered with sparse greyish pruinosity. Pedicel obscure yellow to brown, depending on specimen, wider distally. Few basal flagellomeres yellow to greyish yellow, distal flagellomeres greyish brown. Basal flagellomeres oval, distal segment spindle-shaped. Rostrum brownish, sparsely dusted with grey dorsally, palpus brown.

Thorax. Pronotum pale grey, covered with short erect yellow setae, postpronotum obscure yellow. Presutural scutum semi-polished, uniformly brownish yellow medially, yellowish along frontal and lateral margins, without stripes. Scutal lobe brownish yellow with paler margins. Area between scutal lobes yellow. Scutellum greyish yellow. Mediotergite greyish with yellowish lateral and posterior margins. Pleuron pale brown, sparsely covered with bluish grey pruinosity. Wing (Fig. 22 ) semi-translucent, yellowish. Stigma oval, pale brown. Indistinct darker areas surround cord, distal margin of discal cell and m-cu. Veins pale brown, yellowish at wing base. Venation: Sc comparatively long, reaching costal vein slightly before branching point of Rs, sc-r ~ 3 × its own length from tip of Sc. Rs long, slightly arched at base. Free end of R 1 longitudinal, R 2 oblique, 2.8 × its own length from tip of R 1. R 3 and R 4 slightly arched and diverging towards wing margin, cell r 3 with short stem, veins R 4 and R 5 converging towards wing margin. Cross-vein r-m distinct, at base of discal cell. Discal cell 2.2 × as long as wide. Cell m 1 2.2 × as long as its stem. Cross-vein m-cu slightly before middle of discal cell. Anal vein distinctly arched at wing margin, ending beyond base of Rs. Anal angle widely rounded. Distal radial and medial wing cells with abundant macrotrichiae, covering mostly distal half of each cell, and missing or nearly missing on basal half. Length of male halter 1.0 mm, of female 0.9–1.2 mm. Halter pale, base, and knob slightly infuscate. Coxae obscure yellow, dusted with grey, fore coxa brownish at base. Trochanters pale yellow. Femur pale yellow with slightly darkened brownish apex, tibia yellow with slightly infuscate tip, first tarsomere yellowish brown at base, brown at distal half, remaining tarsomeres brown to dark brown. Male femur I: 4.1–4.4 mm long, II: 5.2 mm, III: 4.3 mm, tibia I: 4.4–5.3 mm, II: 3.8 mm, III: 4.2 mm, tarsus I: 4.5–5.4 mm, II: 4.4 mm, III: 3.9 mm. Female femur I: 4.0– 4.5 mm long, II: 4.4 mm, III: 4.6 mm, tibia I: 4.4–4.5 mm, II: 3.7 mm, III: 5.0 mm, tarsus I: 4.0– 4.7 mm, II: 4.1 mm, III: 4.2 mm. Claw simple, black, without spines.

Abdomen. Tergites brown, pregenital tergite dark brown. Four basal sternites yellow to pale yellow, remaining sternites brown, pregenital sternite darker. Male terminalia (Fig. 23 ) with base of ninth segment darker brown. Distal margin of ninth segment, gonocoxites and gonostyli yellow except blackened distal part of outer gonostylus. Epandrium with two apically blunt lobes at the middle of posterior margin and narrow U-shaped indentation between them. Gonocoxite distinctly wider at base, narrower beyond middle, without additional lobe. Outer gonostylus with long, narrow, slightly curved outer branch, and subbasal widening; widened part rounded, but not extended into separate lobe. Outer branch with sclerotised distal part and blackened apex, two small, apical, hook-shaped teeth at tip of outer margin. Inner gonostylus two-branched, outer branch long, narrow, blunt apex knob-shaped, inner branch short, narrow, reaching to approximately middle of outer branch. Aedeagus long, narrow, strongly curved ventrally, distal part at ~ 90 ° angle to basal part (clearly visible in lateral view). Paramere posteriorly narrow, rod-shaped. Ovipositor obscure yellow. Cercus very long, narrow, distal part slightly raised upwards. Hypogynial valve long, spine-shaped, apex reaching distinctly beyond middle of cercus.

Elevation range.

Unknown.

Period of activity.

Adults were collected only during first two weeks of July in Japan and the Far East of Russia.

Habitat.

Adults are flying among dense grassy vegetation along margins of streams and rivers surrounded by wet broad-leaved forests in South Primorye close to the border with Korea ( Savchenko 1983).

General distribution.

Species was described from Japan (Hokkaido Island), it is recorded from the Far East of Russia (Primorsky Kray).

Remarks.

Wing illustrated in Alexander (1940 a: pl. 1, fig. 7) does not belongs to the genus Adelphomyia or even to the subfamily Limnophilinae . Adelphomyia macrotrichiata wing venation is probably shown in pl. 1 fig. 15. Savchenko (1983: 52) wrote that macrotrichiae nearly completely cover distal radial and medial cells in the specimens from the Far East of Russia (in ‘ Key for identification of regional species’), while North Korean specimens have macrotrichiae mostly at distal half of each cell, basal half bare. Because of that character, North Korean specimens could be identified as A. punctum in Savchenko’s key for the Far Eastern Adelphomyia . Specimens from the Far East have trichiation more similar to the specimens from Japan and to holotype. Savchenko also mentions a large variability of wing venation, especially in the position of R 2, comparative length of cell m 1 and position of m-cu. Shape of A. macrotrichiata aedeagus is very different from that of A. punctum . Aedeagus of A. macrotrichiata is long and strongly curved with distal part at right angle to the basal part when aedeagus of A. punctum is short and nearly straight. Genitalia of all specimens on which was based the record of A. macrotrichiata from North Korea were examined and all of them were identified as A. punctum . No A. macrotrichiata was found in additional material from the same locality, and the species was not found among other Adelphomyia specimens from Korea. Based on this we delete A. macrotrichiata from Korean species list. On the other hand, A. macrotrichiata was found in the Far East of Russia close to the border with Korea and we expect this species at least in the northern part of the Peninsula.

Figures

Figures 22, 23. Adelphomyia macrotrichiata (Alexander, 1923), male, holotype 22 wing 23 genitalia, dorsal view.