Bradysia brevispina Tuomikoski, 1960

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 : 330-332

Bradysia brevispina Tuomikoski, 1960 ( figs 1–8 )

Material examined. Ukraine, Volyn Region: outskirts of Sokyrychi, Kivertsi National Park “Tsumanska Pushcha”, 50.87516 N, 025.51393 E, ca. 210 m a. s. l., hornbeam forest with an admixture of pine and old larches, 28.06.2017, 1 {, leg. A. Babytskiy (No. 225, UkrBIN-795922) .

D i s t r i b u t i o n: Austria, Bulgaria, Czech Republic, Denmark (mainland), Finland, French (mainland), Germany, Italy (mainland), Lithuania, Norway (mainland), Slovenia, Spain (mainland, Balearic Is.), Sweden, Switzerland, The Netherlands ( Menzel & Heller, 2013), Kazakhstan ( Sataeva, 2006), Ukraine (first record), and United Kingdom ( Menzel et al., 2006). Also known from Romania, northern European Russia (Gerbachevskaja- Pavluchenko, 1986), and West Siberia (Altai Region) ( Komarova, 2003).

Diagnosis. Eyes clearly hairy. Eye bridge consists of 2–3 rows of ommatidia (facets), on the side of the eye 12 facet rows present ( fig. 8 ). Maxillary palp dirty yellow, consists of 3 palpomeres. Basal palpomere with only 1 subapical, strong seta or with 1 extra short seta ( fig. 5 ). Sensory area dark, in deep pit, sharply framed on all circle. Flagellum 1.2 mm in length, the 4 th flagellomere 2.5 times as long as thick; the neck 1 / 8 – 1 / 7 of the body length ( fig. 6 ). The length of the longest setae 2 times exceeds the thickness of the flagellomere body ( fig. 6 ). Thorax and abdomen black. All setosity of notum (dorsal exoskeleton of the thorax) yellowish-white, including the longer notopleural and 2 long scutellar setae ( fig. 1 ). Abdomen quite long, sparsely and pale setose. Legs pale brown, but forelegs paler, yellowish. Spurs of t 2 and t 3 1.5 times as long as width of the end of tibiae. The length of femur 3 = 0.65 mm, tibia 3 = 0.80 mm, tarsus 3 = 0.75 mm, metatarsus 3 = 0.35 mm. Wing wide, 1.7 mm in length. Wing membrane glassy, with very weakly colored hind veins, c/w = 0.7–0.8, subcostal vein short, R 1 / R = 0.5, R 1 falling into C at the middle of the wing clearly in front of the base of M-fork; R 5 ventrally naked or almost naked, ends before the top of M 2 and roughly opposite the border between the 2 nd and 3 rd thirds of M 1; y naked or almost naked; M-fork almost equally wide, stM/M-fork = 1; stCuA weakened, stCuA/x = 0.5 ( fig. 7 ). Halter pale yellow ( fig. 1 ). Hypopygium dark, pretty narrow; ventral base of gonocoxites U-shaped, with short marginal setae in the proximal part, the rest of the margin glabrous ( fig. 2 ). Gonostylus elongate with short and strong, bluntly pointed apical tooth and subapical group of slightly curved hyaline spines, at least 2 times as long as tooth ( fig. 4 ) ( Tuomikoski, 1960).

Bradysia brevispina belongs to the large B. tilicola group contains 32 species, which differ from the other Bradysia by trapezoid, membranous or weakly sclerotized tegmen with flattened apex and small, roundish, dark sensory area of basal palpomere, located in a distinctly deep pit ( Menzel & Mohrig, 2000; Menzel & Heller, 2005). From the other species of this species group B. brevispina differs by dark thorax and abdomen, yellowwhite halteres and body setosity, the value of the 4 th flagellomere length/width index 2.5 and by the structure of hypopygium (U-shaped ventral base of gonocoxites and elongate gonostylus with short and strong, bluntly pointed apical tooth, and subapical group of slightly curved spines, at least 2 times as long as tooth).

Note. Tibial organ of t 1 in present specimen consists of 6 pale setae in comb-like row ( fig. 3 ). Studied male imago 1.8 mm in length, wing 1.3 mm in length and 0.6 mm in width, y bare ( fig. 7 ). Biometric indexes of studied specimen: width/length of wing = 0.46; stM/Mfork = 1.04–1.05; R 1 /R = 0.75–0.78; x/y = 1.36–1.38; stCuA/x = 0.65–0.67; c/w = 0.69–0.72. Length of spur/width of tibia: leg 1 = 1.46–1.51, leg 2 = 1.74; leg 3 = 1.25–1.40. Length of metatarsus/length of tibia: leg 1 = 0.50–0.51, leg 2 = 0.49, leg 3 = 0.50. Length of tibia 3/ length of thorax 0.73.

Figures

Figs 1–8. Bradysia brevispina, male: 1 — thorax, lateral view; 2 — hypopygium, ventral view; 3 — anterior apex of fore tibia (t 1) with tibial organ, lateral view; 4 — gonostylus, ventral view; 5 — maxillary palp, lateral view; 6 — fourth flagellomere, lateral view; 7 — wing; 8 — eye bridge, frontal view. Scale bars: 0.10 mm.