Medetera ambigua (Zetterstedt, 1843)

Kejval, Zbyněk & Pollet, Marc, 2023, The genus Medetera (Diptera: Dolichopodidae) in the Czech Republic with first records of twelve species, Zootaxa 5254 (1), pp. 69-93 : 71-72

Medetera ambigua (Zetterstedt, 1843)

Material examined. Bohemia: Kateřina (5840), Soos NNR, 50°09′02″N 12°24′15″E, 440 m, 5.vii.2021, 1 ♁ ( MCH) . Druztová, 2 km SW (6246), Berounka river env., 49°46′25″N 13°26′30″E, ca 295 m, Populus , 2.viii.2021, 2 ♀♀ ( MCH) . Rozvadov (6341), Diana NR, 49°38′2″N 12°34′42″E, 500–530 m, Alnus , 13.vii.2020, 1 ♀ ( MCH) . Železná (6341), Farský potok (stream) env., 49°35′53″N 12°34′40″E, 500 m, Populus , 5.vi.2021, 1 ♁ 1 ♀ ( MCH) . Horšovský Týn (6343), castle garden, 49°31′N 12°56′E, 370–400 m, Pinus 7.vii.2020, 5 ♁♁ 1 ♀ ( MCH) . Klenčí pod Čerchovem (6542), 49°25′47″N 12°48′12″E, 600 m, Picea , 15.vi.2022, 2 ♁♁ 2 ♀♀ ( MCH) . Nemanice, SW of (6542), Nemanický potok (stream) env., 49°25′41″N 12°42′38″E, ca 500 m, 2.ix.2021, 1 ♀ ( MCH) . Postřekov (6542), Postřekovské rybníky NR, 49°26′60″N 12°49′39″E, 400 m, Populus , 8.vii.2020, 2 ♁♁ 1 ♀ ( MCH) ; ditto, 18.vii.2020, 1 ♁ ( MCH) . Postřekov (6542), Škarmanka Mt. SE slope, 49°27′03″N 12°45′16″E, 840 m, Picea , 21.vii.2021, 1 ♀ ( MCH) . Vranov, 1 km SW (6542), 49°28′22″N 12°43′31″E, 800 m, Picea , 22.vi.2020, 2 ♁♁ 4 ♀♀ ( MCH) . Domažlice (6543), garden in town, 49°26′14″N 12°55′14″E, 420 m, Picea , 24.viii.2021, 1 ♀ ( MCH) . Slatina (6545), Bělýšov, 49°27′08″N 13°12′06″E, 650–690 m, Pinus , 8.vi.2022, 1 ♁ 1 ♀ ( MCH) . Pec (6642), 49°23′04″N 12°49′30″E, 650 m, Picea , 4.vii.2020, 4 ♁♁ 6 ♀♀ ( MCH) . Pec (6642), Čerchovské hvozdy NNR, top of ridge, 49°22′49″N 12°47′43″E, 750–1025 m, Picea , 5.vii.2020, 4 ♁♁ 6 ♀♀ ( MCH) . Pec, 3 km SW (6642), Malinová hora, 49°23′24.5″N 12°46′52″E, 850 m, Picea , 8.vii.2021, 2 ♁♁ ( MCH) . Hamry, 2.5 km W (6744), Ostrý potok (stream) valley, 49°12′37″N 13°07′14″E, 850–1000 m, 16.vi.2022, 2 ♁♁ 1 ♀ ( MCH) . Hamry, 2.5 km S (6844), Bílý potok (stream) valley, 49°11′49″N 13°09′19″E, 760–780 m, 26.vi.2022, 1 ♀ ( MCH) ; ditto, 49°11′17″N 13°09′33″E, 930– 1000 m, Picea , 2.vii.2022, 2 ♀♀ ( MCH) . Javorná, 3 km S (6845), Starý Brunst, 49°11′27″N 13°18′23″E, Křemelná stream env., 935 m, 3.vii.2022, 1 ♁ ( MCH) . Špičák (6845), Čertovo jezero (lake) env., 49°10′N 13°11′E, 1030–1100 m, NW slopes above, Picea , 23.vi.2022, 1 ♁ ( MCH) . Železná Ruda (6845), Svarožná stream valley, 49°08′60″N 13°10′43″E, 900–1000 m, Picea , 23.vi.2022, 3 ♁♁ 5 ♀♀ ( MCH) . Železná Ruda, 5 km NE (6845), Nový Brunst env., 49°10′23″N 13°16′18″E, 970 m, Picea , 3.vii.2022, 1 ♀ ( MCH) . Železná Ruda (6845), Debrník, 49°07′19″N 13°14′09″E, 800 m, Picea , 2.viii.2021, 4 ♁♁ 5 ♀♀ ( MCH) . Prášily, 4 km NE (6846), Šerlův Dvůr, 49°8′18″N 13°23′30″E, 820 m, Pinus , 11.viii.2021, 4 ♁♁ 3 ♀♀ ( MCH) . Modrava, 4 km NW (6946), Javoří Pila env., 49°02′N 13°27′E, 1040 m, 12.viii.2021, 1 ♁ 2 ♀♀ ( MCH) . Horská Kvilda, 2 km W (6947), slope above Hamerský potok (stream), 49°03′33″N 13°31′36″E, 960–980 m, Picea , 4.vii.2021, 4 ♁♁ 10 ♀♀ ( MCH) . Horská Kvilda, 2 km W (6947), slope of Antýgl Mt. , 49°02′50″N 13°32′03″E, ca 1200 m, Picea , 24.viii.2021, 1 ♁ ( MCH) .

Moravia: Bělá (6074), 49°58′39″N 18°8′49″E, 280 m, 12.vii.2022, 1 ♁ ( MCH) . Hodonín (7168), Pánov NM, 48°53′09″N 17°08′18″E, 200 m, sandy steppe, Populus , 9.vii.2022, 2 ♁♁ ( MCH) .

Distribution. European species, rather widespread, including the European part of Russia and Ukraine.

Status in CZ. Previously known from only three historical records from Bohemia: Aš, Cetviny ( Kowarz 1877, 1884) and Františkovy Lázně ( Vimmer 1913). New records (also the first for Moravia) hereby confirm its presence after more than 100 years.

Ecology. Exclusively on tree trunks, mainly on spruce (see also Pollet et al. 2011) in sunny sites (margins of forests, clearings), widespread from lowlands to mountains (ca 290–1200 m a.s.l.).

Remarks. The key by Negrobov & Naglis (2016) is misleading for this species as it mentions the halter being pale, whereas in reality, it is often distinctly dark in M. ambigua .