Bradysia angustoocularis Mohrig & Krivosheina, 1989

Babytskiy, A. I., Bezsmertna, O. O., Moroz, M. S., Pavliuk, S. D. & Honcharenko, B. V., 2020, New Records Of Bradysia Species (Diptera, Sciaridae) From Ukraine, Zoodiversity 54 (4), pp. 329-340 : 335-337

Bradysia angustoocularis Mohrig & Krivosheina, 1989 ( figs 28–37 )

= Bradysia luteocoxa Mohrig & Krivosheina, 1989

Material examined. Ukraine, Volyn Region, Turiisk , 51.079814 N, 024.530391 E, ca. 190 m a. s. l., country yard of private house, near the living trunk of Juglans regia L. with the remains of a rotten branch, collected with aspirator, 03.05.2015, 2 {, leg. A. Babytskiy (No. 154-5, UkrBIN-795853-4) ; Ukraine, Volyn Region, Turiisk , 51.079814 N, 024.530391 E, ca. 190 m a.s.l., wet weather, country yard of private house, near the living trunk of J. regia in the remains of a rotten branch, collected with aspirator, 01.05.2015, 4 {, 1}, leg. A. Babytskiy (No. 156-7, UkrBIN-795855-6) ; Ukraine, Volyn Region, Turiisk , 51.079814 N, 024.530391 E, ca. 190 m a. s. l., country yard of private house, near the living trunk of J. regia with the leavings of the rotten branch, collected with aspirator, 04.05.2015, 2 {, 2}, leg. A. Babytskiy (No. 161, UkrBIN-795860) ; Ukraine, Volyn Region, Turiisk , 51.079814 N, 024.530391 E, ca. 190 m a. s. l., country yard of private house, near the living trunk of J. regia in the remains of rotten branch, collected with aspirator, 02.05.2015, 1 {, leg. A. Babytskiy (No. 163, UkrBIN-795862) .

Distribution: Germany ( Menzel & Heller, 2013), Finland ( Roskov et al., 2019), Kyrgyzstan ( Mohrig et al., 1989a), United Kingdom ( Menzel et al., 2006), Ukraine (first record).

Diagnosis. Male imagoes reach 2.5–4 mm in length ( fig. 28 ). Eye bridge narrow, consists of 2 facet rows ( fig. 37 ). Face very wide — the distance from the eye bridge to ocelli large. Antenna long, flagellomeres with a sharply neck and dense, pale and pressed setae; the length/width of the 4 th flagellomere 2.6 ( fig. 31 ). Maxillary palp consists of 3 palpomeres; basal palpomere with a slightly deepened sensory pit and one external seta (sometimes with another shorter seta); p 2 and p 3 strong, almost equal in length or p 2 a bit shorter ( fig. 32 ). Thorax dark, gonocoxites and legs slightly paler. Mesonotum with fine pale setae, lateral and scutellar setae stronger ( fig. 30 ). Wing membrane bright; R 1 = 0.5 R; c = 0.5w; y = x, both naked or y with 1–2 macrotrichia; M-fork narrow; posterior wing veins well developed ( fig. 36 ). Halter bright ( figs 28–30 ). Tarsal claws without teeth. Hypopygium massive; outer side of gonocoxite with long setae, inner side shortly setose ( fig. 35 ); gonostylus compact, with a big claw-like tooth on the tip, 1–2 spines located behind the tooth, on dorsal side of gonostylus, and subapical group of 4–5 slightly curved dark spines ( fig. 35 ); tegmen broadly rounded, apically cut, with large field of fine teeth; aedeagus short (Mohrig, Krivosheina, & Mamaev, 1989 a, b).

Bradysia angustoocularis belongs to the large B. fungicola group and contains 33 species, which differ from the other Bradysia by distinctly paler gonocoxites, legs and halteres than thorax, inner sides of the gonocoxite cleavage without basal differentiation, at least basal part of distal flagellomeres with scarred and often transverse wrinkled surface, necks of basal flagellomeres usually unicolourous dark, apical segments very often with bicoloured bands (with paler base and slightly smoky ring along apical margin), apex of gonostylus with relatively dense setae, with or without short, claw-like apical tooth ( Menzel & Mohrig, 2000). Bradysia angustoocularis a large and dark species, well recognizable by the strikingly wide face with a narrow eye bridge, the construction of the gonostyli and the fine body setosity ( Mohrig et al., 1989 a). Bradysia angustoocularis similar to B. praemonticola Mohrig & Krivosheina, 1989 , but differs from it by the stubby gonostyli, shorter flagellomeres, darker thorax and paler halteres ( Mohrig et al., 1989 b).

Note. The body length of studied imagoes reach from 2.3–2.7 mm (males) to 3.1– 3.3 mm (females). Wing of male 1.8–2.1 mm long and 0.8–0.9 mm wide; y naked or bears 1–2 macrotrichia. Tibial organs of t 1 in present specimens consist of ca. 4 setae in comblike row ( fig. 33 ). Biometric indexes of studied specimens: width/length of wing = 0.42– 0.48; stM/M-fork = 1.00–1.07; R 1 /R = 0.52–0.63; x/y = 1.04–1.33; stCuA/x = 0.33–0.60; c/w = 0.63–0.72. Length of spur/width of tibia: leg 1 = 1.08–1.38, leg 2 = 1.27–1.54; leg 3 = 1.21–1.58. Length of metatarsus/length of tibia: leg 1 = 0.52–0.60, leg 2 = 0.50–0.54, leg 3 = 0.45–0.48. Length of tibia 3/length of thorax 1.06–1.17.

Figures

Figs 28–37. Bradysia angustoocularis, imagoes: 28 — habitus of male, lateral view (terminalia removed, see fig. 34); 29 — habitus of female, lateral view; 30 — thorax, lateral view; 31 — fourth flagellomere, lateral view; 32 — maxillary palp, lateral view; 33 — anterior apex of fore tibia (t) with tibial organ, lateral view; 34 — 1 hypopygium, ventral view; 35 — gonostylus, ventral view; 36 — wing, dorsal view; 37 — eye bridge, frontal view. Scale bars: 28–29 — 1.0 mm; 30–37 — 0.10 mm.