Cerchysius subplanus (Dalman, 1820)

Cerchysius subplanus (Dalman, 1820) View in CoL

Figs 6, 7

Material examined. 33 ♀♀, 10 ♂♂: IRAN, West-Azarbaijan Province , Naqadeh, Solduz Wetland, 37º02′ N, 45º35′ E, 1277 m a.s.l., 21 July 2020, 29 April 2021, Y. Karimpour leg., ex Calamagrostis epigejos GoogleMaps .

Diagnosis (abstracted from Mercet 1921). Female ( Fig. 6B): head and pronotum metallic blue, mesoscutum and scutellum greenish-golden, and gaster black-violet with a strongly shining golden-green basal tergite ( Figs 6B, 7A– E); fore wings hyaline or slightly infuscate medially, with very short marginal fringe ( Fig. 7F,H); ovipositor black, two-thirds length of gaster ( Fig. 7C); antennal structure diagnostic: scape elongate, equal to first three funicular segments combined; Fu 1 elongate, nearly 3× as long as broad; clava large, depressed, as long as the preceding three funicular segments combined ( Fig. 6D).

Male ( Fig. 6A): resembles female in general coloration but differ by having a golden-greenish vertex and frons, and the tegula whitish basally ( Fig. 6A); antennal structure diagnostic: entirely yellow with brownish markings on scape and pedicel; funicular segments elongate, with Fu 1 distinctly longer, apical segments nearly as long as basal segments; clava slightly larger than the preceding funicular segment ( Fig. 6C).

Distribution. IRAN: West Azarbaijan Province ( Salimi et al. 2025). EXTRALIMITAL: Central Asia, Europe, former USSR, India, Mongolia, North Korea, China, Russia, Thailand, Transcaucasus, Turkey ( UCD Community 2023).

Biological association. Multiple species of Diptera , representing various families were collected from laboratory-maintained plant specimens and submitted to taxonomic specialists for identification. Some species of Eriococcidae and Pseudococcidae ( Hemiptera ) and Chamaemyiidae ( Diptera ) associated with plants of the Fagaceae and Poaceae families plants are documented hosts ( UCD Community 2023). Given the presence of Diptera , such as leafminers ( Liriomyza : Agromyzidae ), aphid flies ( Chamaemyiidae ), gall-makers ( Lasioptera calamagrostidis : Cecidomyiidae ), and grass flies ( Chlorops : Chloropidae ), among the herbivores of Calamagrostis , it is likely that the host of this parasitoid belongs to one of this Diptera .