Bradysia lobata Hondru, 1968

Babytskiy, A. I., Rubanovska, N. V. & Bezsmertna, O. O., 2022, New Records Of Sciarid Species (Diptera, Sciaridae) From Ukraine. Iv, Zoodiversity 56 (6), pp. 435-446 : 438-439

Bradysia lobata Hondru, 1968 ( figs 4–9 )

M a t e r i a l e x a m i n e d. Ukraine, Ternopil Region: outskirts of Luchka, “Zapust” tract of Mykulyntsi forestry, 49.40547° N, 25.61313° E, ca. 350 m a. s. l., oak-hornbeam forest, old road on the bottom of wet ravine, sweeping, 07.05.2017, 1 Ơ (A. Babytskiy) (No. 185, UkrBIN-795882) .

D i s t r i b u t i o n: Europe: Czech Republic, Germany, Ireland, Norway, Romania, Sweden, Ukraine (first record), United Kingdom ( Gerbachevskaja-Pavluchenko, 1986; Heller & Menzel, 2017; GBIF, 2022 b; this study).

Diagnosis. Male adults reach 2.5–3.0 mm in length. Head black. Compound eyes black haired. Eye bridge ( fig. 9 ) untypically narrowed in the middle, almost interrupted without any facets and only with thin sclerotized strip connecting the eye bridges between the antennal scapuses. The ends of eye bridges near the constriction consist of 2 rows of ommatidia. Maxillary palpus yellowish-brown, 3-segmented, segments very short. Basal palpal segment spherical with sensory pit. Middle palpal segment bell-shaping, smaller than the 1st segment, with 4–5 setae. Terminal palpal segment small and elongated, with 5–6 setae. Antennae brown, 1.5– 1.9 mm long. Flagellomeres with dense upward curving setae and short necks. The 4th flagellomere is 2.0–2.6 times as long as wide, length/width of 4th flagellomere of Ukrainian specimen ( fig. 6 ) is 2.6, with a basal node index of 2.33. Body dark brown. Thorax. Notum setose. Posterior pronotum bare. Anterior pronotum with 4–6 setae. Scutum with short and weak acrostichal and dorsocentral setae. Scutellum with 3 thin setae. Wing is 2.3–2.8 mm long and 0.8–1.1 mm wide, width/length of wing = 0.37–0.39. Membrane yellowish-brown, without macrotrichia. Anterior and posterior veins distinct; stM longer than M 2, stM/M-fork of Ukrainian specimen = 0.76–0.80; R > R 1 , R 1 / R = 0.88–0.91; R 1 with 6–7 macrotrichia, falls into C well before the base of M-fork; x = 3.0 y, x/y of Ukrainian specimen = 2.05–2.22, both bare; stCuA = 0.66 x, stCuA/x of Ukrainian specimen = 0.90–1.00; c = 0.80 w, c/w of Ukrainian specimen = 0.70. Halter yellowish-brown with 2 rows of 6–8 black setae. Legs brown, not clearly paler than thorax and abdomen. Forefemur = 0.6–0.7 mm; foretibia = 0.6–0.9 mm; foremetatarsus = 0.3–0.4 mm; foretarsus = 0.7–0.8 mm; midfe- mur = 0.7–0.8 mm; midtibia = 0.7–1.0 mm; midmetatarsus = 0.3–0.5 mm; midtarsus = 0.7–0.9 mm; hindfemur = 0.7–1.0 mm; hindtibia = 0.9–1.2 mm; hindmetatarsus = 0.4– 0.5 mm; hindtarsus = 0.8–1.0 mm. Tibial organ of p 1 ( fig. 8 ) with comb-like row of 5– 6 bristles. Length of spur/width of tibia: p 1 = 1.24, p 2 = 1.20–1.31, p 3 = 1.12–1.36. Length of metatarsus/length of tibia: p 1 = 0.48, p 2 = 0.45–0.46, p 3 = 0.43. Tarsal claws without teeth. Hypopygium ( fig. 4 ). Sclerotized parts black to dark brown, membranous parts light brown to dark yellow. Intergonocoxal area with a large tongue-shaped basal lobe reaching a half of gonocoxite length. Basal lobe ( fig. 7 ) setose laterally and apically, with only scattered setae ventrally. Gonocoxite well developed, longer than gonostylus, covered with dense, dark setae. Gonostylus ( fig. 5 ) relatively short, beak-shaped, with narrow apical tooth slightly longer than subapical spines. Tegmen triangular, with narrow truncated apex ( Hondru, 1968) .

Bradysia lobata belongs to the cognominal species group containing 7 Palaearctic species which differ from the other groups of Bradysia in basal lobe, which overlaps the inner margin of gonocoxites. Basal lobe of these species is weaker sclerotized and additionally covered with finer bristles on the lobe surface, at least over apex. In addition, the gonostylar tooth is narrow, slightly longer than subapical spines ( Menzel & Mohrig, 2000). Bradysia lobata differs from related species of the group by a very large intercoxal lobe and a specific structure of the eye bridge (see above).

Figures

Figs 4–9. Bradysia lobata Ơ: 4 — hypopygium, ventral view; 5 — gonostylus, ventral view; 6 — fourth flagellomere, lateral view; 7 — basal lobe, ventral view; 8 — anterior apex of fore tibia (p1) with tibial organ, prolateral view; 9 — eye bridge, dorsal view. Scale 0.1 mm.