Diamesa amplexivirilia Hansen, 1976

Krasheninnikov, Andrey B., Makarchenko, Eugenyi A., Semenchenko, Alexander A., Gavrilo, Maria V. & Vshivkova, Kristina A., 2020, Morphological description and DNA barcoding of some Diamesinae (Diptera Chironomidae) from the Severnaya Zemlya Archipelago and the Vaigach Island (Russian Arctic), Zootaxa 4802 (3), pp. 587-600 : 592

Diamesa amplexivirilia Hansen

( Fig. 11 )

Diamesa amplexivirilia Hansen in Hansen & Cook, 1976: 53 ; Makarchenko 1980: 86, 1981:108, 1985: 77, 2006: 261, 473, 614; Ashe & O’Connor 2009: 270.

Material examined. 1 adult male, RUSSIA: Severnaya Zemlya Archipelago , Bolshevik Island , Mikoyan Bay, Chernaya River, N 79,207 68, E 102,310 9. 01.IX.2019, leg. A. Krasheninnikov.

Adult male (n = 1). Total length 2.4 mm. Wing length 2.24 mm. Total length/wing length 1.07. Wing length/ length of profemur 2.73.

Сolouration. Head, thorax, legs and hypopygium dark brown; abdomen brown to dark brown; wing veins yel- lowish brown.

Head. Eyes hairy, microtrichia visible along lateral eye margin when head is viewed from front. Temporal setae 11, including 8 verticals and 3 preoculars. Clypeus with 5 setae. Antenna with 8 flagellomeres and reduced plume of setae 24–48 μm long; number of setae in flagellomeres 1–7, respectively 2–3: 2: 1–2: 1–2: 2: 2: 4. Flagellomeres 1–8 length (μm): 76, 36, 28, 24, 24, 24, 24, 96–104; terminal flagellomere with 3 subapical setae, 12–16 μm long and with 3 setae basally, 32–36 μm long; pedicel with 3 setae; AR 0.41–0.44. Antennal length/palpal length 1.18–1.21. Palpomeres lengths (in μm): 32; 40; 72; 60; 78. Palpomere 3 in distal part with sensilla capitata with diameter 16 μm. Palpomeres 1–5 length/head width 0.69.

Thorax. Antepronotum with 3–4 ventrolateral setae. Dorsocentrals 10, prealars 4, scutellars 7 (in one row).

Wing. R with 6 setae, R 1 with 8 setae; R 4+5 with 5 setae in distal part. Costa extension 49 μm long. RM length/ MCu length 2.33. Brachiolum with 1–2 setae. Anal lobe well developed, rounded. Squama with 14–15 setae. VR 0.93.

Legs. Spur of fore tibia 32 μm long; spurs of mid tibia 32 μm long; of hind tibia 44 μm and 32 μm long. Hind tibial comb with 9 setae. Lengths and proportions of leg segments as in Table 3.

Hypopygium ( Fig. 11 ). Tergite IX with 4–5 setae (from one side), 8–12 μm long and with slender anal point 52 μm long, which directed somewhat to nearly ventrad. Laterosternite IX with dorsolateral region greatly produced along side of gonocoxite and with 5–9 setae, 16–20 μm long. Basal plate fairly well developed, slightly produced disto-medially, with numerous microtrichia ventrally. Medial field scarcely developed, with short setae. Basimedial setal cluster absent. Gonostylus broadest in basal 0.4, then abruptly narrowing, with megaseta and about 3–4 terminal teeth. Transverse sternapodeme 68 μm long, triangular, with rounded apex. HR 1.65.

Comments. The morphological description of the D. amplexivirilia from the of Severnaya Zemlya Archipelago is similar to that of males from other regions of the Holarctic. We noted earlier that this species is closely related to D. alpina Tokunaga and D. davisi Edwards ( Makarchenko 1980) , as well as to the species D. saetheri Willassen and D. serratosioi Willassen ( Makarchenko 1985) . The obtained barcoding data (see below) confirm a close similarity of D. amplexivirilia with the last two species.

Distribution. Holarctic arcto-alpine species, known from mountains of Kolyma River upper stream, Arctic regions of Eurasia and Canada ( Ashe & O’Connor 2009).

Figures

FIGURES 8–12. Diamesa urvantsevi sp. nov. (8–10), D. amplexivirilia Hansen (11) and Pseudokiefferiella sp. (12), males. 8, 10–12, hypopygium in dorsal view; 9, “anal point”. ap—“anal point”.