Adelphomyia Bergroth 1891

Adelphomyia Bergroth, 1891 Adelphomyia Bergroth, 1891: 134; Savchenko and Krivolutskaya 1976: 57; Savchenko 1983: 49; Savchenko 1986: 273–275; Savchenko 1989: 76–79. Limnophila (Tricholimnophila) Alexander, 1928: 476–477. Limnophila (Adelphomyia): Alexander 1938: 324; Ishida 1959: 2. Type species. Adelphomyia helvetica Bergroth, 1891 (= punctum Meigen, 1818) (West and East Palaearctic). Type locality. Weissenburg, Canton Bern, Switzerland. Description. Medium-sized crane flies with body length 3.9–8.4 mm and wing length 5.5–8.8 mm. Colouration varies from pale yellow to dark brown or black (Figs 25, 40, 44). Head. Rounded posteriorly. Antenna with 14 - segmented flagellum. Flagellomeres slightly elongate or oval, covered with short pubescence, verticils variable, up to 2.5 × as long as respective segment. Thorax. Frontal margin of pronotum straight. Mesonotal prescutum with distinct tubercular pits and pseudosutural fovea. Katepisternum bare, without setae. Meron small. Middle and posterior coxae close to each other. Wing (Figs 1, 5, 9, 12, 15, 17, 22, 24, 27, 29, 34, 36, 38, 41, 45) comparatively wide, no pattern or with darkening surrounding only cross-veins except stigma. Arculus present, vein Sc reaching wing margin slightly before branching point of Rs, sc-r approximately its own length before tip of Sc. R 1 elongate, R 2 2–3 × its own length before tip of R 1. Radial sector long, cell r 3 long with short stem. Cell m 1 usually long, but sometimes missing completely (e. g., one wing of A. satsumicola (Alexander, 1930) holotype). Discal cell always present, usually elongate. Cross-vein m-cu far beyond branching point of M. Anal vein reaching wing margin at approximately same level as base of Rs. Anal angle wide. Distal wing cells always with macrotrichiae. Frontal tibia with single spur, tibiae of second and third pairs of legs with two spurs each. Abdomen. Tergites with two transverse indentations frontally. Male terminalia approximately as wide as rest abdominal segments. Epandrium (ninth tergum) with two small lobes at the middle of posterior margin. Gonocoxite simple: elongate with no additional lobes, two pairs of elongate, narrow gonostyles. According to Savchenko (1986) interbases are missing, still the structure is present (Figs 7, 20, 32, 43), in addition, Ribeiro (2008) showed the structure is clearly noticeable in Limnophilinae. Aedeagus long, narrow, one pair of elongate parameres, but length varies widely depending on species. Ovipositor (Figs 8, 21, 33, 46) with long, narrow cercus and hypogynial valve. Twenty-five species of Adelphomyia are known worldwide (Oosterbroek 2024), 13 of them occur in Oriental Region and 12 (one of them with two subspecies) in East Palaearctic. Only A. punctum (Meigen, 1818) has a wide distribution, occurring in East and West Palaearctic. List of Palaearctic Adelphomyia species (species from Korean Peninsula marked with asterisk) Adelphomyia acicularis acicularis (Alexander, 1954) (Figs 1–3) * Adelphomyia acicularis bidens Savchenko, 1983 (Figs 4–8) Adelphomyia biacus (Alexander, 1954) (Figs 9–11) Adelphomyia breviramus (Alexander, 1924) (Figs 12–14) Adelphomyia caesiella (Alexander, 1929) (Figs 15, 16) * Adelphomyia flavella (Alexander, 1920) (Figs 17–21) (*) Adelphomyia macrotrichiata (Alexander, 1923) (record from North Korea based on misidentification) (Figs 22, 23) Adelphomyia pilifer (Alexander, 1919) (Figs 24–26) Adelphomyia prionolaboides (Alexander, 1934) (Figs 27, 28) * Adelphomyia punctum (Meigen, 1818) (Figs 29–33) Adelphomyia saitamae (Alexander, 1920) (Figs 34, 35) Adelphomyia satsumicola (Alexander, 1930) (Figs 36, 37) Adelphomyia simplicistyla (Alexander, 1940 b) (Figs 38, 39) * Adelphomyia jejuana Podenas, sp. nov. (Figs 40 – 46) Key to Palaearctic species of the genus Adelphomyia