Stempellinella edwardsi Spies et Saether 2004

Stempellinella edwardsi Spies et Saether, 2004

Figs 41–46.

Tanytarsus (Stempellina) minor Edwards, 1929: 420; Goetghebuer 1937 –1954; Brundin 1947, 1948; Langton 1991; Cranston et al. 1989: 489, Fig. 10.63 A, B; Langton & Visser 2003.

Tanytarsus (Stempellina) minusculus Edwards, 1929: 417.

Stempellinella edwardsi Spies et Saether, 2004: 65; Stempellinella sp. 1 Makarchenko et Orel, 2023: 145.

Material examined. RUSSIA: AMUR REGION, Zeya reservoir, stream near the Shirokovskaya River, 02.vii.2013, 5 males, leg. T. Tiunova; Zeya reservoir, 63 km (right side of the reservoir), 06.vii.2013, 24 males, leg. T. Tiunova; MAGADAN REGION, Big Darpir Lake (eastern shore), 05.viii.2018, 1 male, leg. E. Khamenkova; SAKHALIN REGION, Sakhalin Island, Chaivo Bay, Sandy Lake, 28.viii.2001, 1 male, leg. T. Tiunova; Noglinsky district, Noglinsky district, the vicinity of the village of Val, Rybnoye Lake, 3–5.viii.2003, 10 males, leg. E. Makarchenko; Okhinsky district, a lake 15 km east of Piltun village, 6–7.viii.2003, 1 male, leg. E. Makarchenko.

Diagnosis. Male: yellowish brown coloured species, with wing 1.10–1.46 mm long. AR 1.06–1.37; ultimate flagellomere 336–400 μm; length of 2–4 flagellomeres of maxillary palpomeres 279–315 μm; frontal tubercles conical, 12–18 μm long. LR PI 1.26–1.53; combs of mid and hind tibiae with 2 spurs. T-shaped anal tergite band; 1–2 lateral setae present; anal point with 25–45 small spinulae at base; 3–5 small median tergite setae close to anal point; superior volsella oval; median volsella strongly curved, without microtrichia, with simple lamellae, stem 30–39 μm long.

Redescription. Adult male (n=6). General colour yellowish brown. Total length 1.5–1.7 mm; total length/wing length 1.15–1.35.

Head (Fig. 41). Frontal tubercles conical, 12–16 μm long. Temporal setae 3–8. Clypeus with 7–14 setae. Maxillary palp yellowish, 279–315 μm long; lengths of last 4 palpal segments (μm): 21–33, 69–87, 78–90, 102–111. Palp length/head width 1.20–1.37. Scapus brown, flagellomeres (1–10) dark-brown, 616–720 μm long. AR 1.20–1.37. Ultimate flagellomere 336–400 μm long. Antenna length/palp length 2.17–2.39.

Thorax. Ground colour of scutum yellowish, mesonotal strips brown or dark brown. Ac 9–12, Dc 7–8, Pa 1. Scutellum yellowish or yellowish brown, with 6–10 setae. Postnotum dark brown. Wing (Fig. 42) length 1.26–1.46 mm. R, R 1 with 35–41 setae, R 4+5 with 18–25 setae, Cu 1 with 10–12 setae, M 3+4 with 13–20 setae, Cu with 9–18 setae, An with 14–22 setae. VR 1.36–1.58.

Legs (Table 6). Legs yellowish. Fore tibia with 12–15 mm long spur; terminal combs of Ti 2 and Ti 3 with spurs, 15 μm long. BR 1 3.0, BR 2 2.9–5.0, BR 3 6.4. Sensilla chaetica on Ta 1 P 2 absent.

Abdomen. Yellowish brown.

Hypopygium (Figs 43–46). Anal tergite bands T-type; 3–5 median setae at anal point base; 1–2 lateral setae; small microtrichia-free areas present on each side of anal point base. Anal point 30–39 μm long, wide at about apical 1/3, apically thin and pointed; 25–45 small spinulae between anal crests; 8–10 lateral setae at anal point base. Gonocoxite 84–99 μm long; with 5–6 setae along inner margin. Width of transverse sternapodeme 45–54 μm. Phallapodeme 66 μm long. Superior volsella oval, 30–36 μm long, with 3–4 dorsal (sometimes situated on tubercle) and 3 median setae, without microtrichia. Digitus absent. Stem of median volsella 30–39 μm long, total length 60–69 μm, median volsella strongly curved posteriorly with simple lamellae, microtrichia absent. Inferior volsella 60–72 mm long, apically club-shaped, with 9–12 distal setae. Gonostylus 51–60 μm long, with 4–5 setae in apical part and 1 apical seta. HR 1.40–1.76.

Female, pupa and larva described by Ekrem 2007: 1407, Figs 13, 14.

Remarks. When comparing the morphometric data of males described in Ekrem (2007) and our data, no significant differences were found (see Table 2).

Distribution. Widely distributed in Europe, Eastern Palearctic and Nearctic (Saether & Spies 2004).