Chironomus lugubris Zetterstedt sensu Lundström

Saether, Ole A., 2004, The chironomids (Diptera, Chironomidae) described by Lundström (1915) from arctic Siberia, with a redescription of Derotanypus sibiricus (Kruglova & Chernovskii), Zootaxa 595, pp. 1-35 : 8-9

Chironomus lugubris Zetterstedt sensu Lundström

( Figs. 5, 8 )

? Chironomus lugubris Zetterstedt, 1850: 3490 .

Chironomus lugubris Zett. sensu Lundström (1915: 7) .

Total length 5.87–6.22 mm. Wing length 3.52–4.22 mm long. Total length/wing length 1.48–1.66. Wing length/length of profemur 2.45–2.65.

Head. AR 0.35–0.42. Flagellomere lengths (in m): 199–203, 131–143, 146–173, 105–116, 206–240. Dorsal interocular distance 116–135 m, ventral interocular distance 214– 244 m. Frontal tubercle ( Fig. 5 ) 15–38 m high, 15–17 m wide; with strong, conspicuous microtrichia, but in contrast to C. lundstroemi and C. trabicola no microtrichia have distinct bases. Temporal setae 29–47, consisting of 10–13 inner verticals, 11–18 outer verticals and 11–16 postorbitals. Clypeus with 32–55 setae. Tentorium 210–244 m long, 53–60 m wide; stipes 281–315 m long, 90–124 m wide. Palpomere lengths (in m): 75–94, 75–86, 274–311, 248–281, 428–443. Third palpomere with 5 lanceolate, 30 m long sensilla clavata.

Thorax. Antepronotal setae apparently absent. Acrostichals not observed, dorsocentrals 38–40, prealars 10–13, supraalars 1–2. Scutellum with about 40–50 setae.

Wing. VR 1.01–1.10. Brachiolum with 3–4 setae, R with 26–34, R1 with 49–67, R4+5 with 74–90 setae, other veins bare. Squama with 35–39 setae.

Legs. Scale of front tibia 49–75 m long, spurs of mid tibia 49 and 38–45 m long including combs, spurs of hind tibia 83–90 and 38–60 m long including combs. Width at apex of front to hind tibiae (in m) as 83–99, 98–101,105–113. Sensilla chaetica about 140–145 on ta1 of mid leg, about 125 on ta1 of hind leg. Lengths (in m) and proportions of legs:

Abdomen. Tergite VIII with about 50–70 setae. Sternite VIII with about 40–70 median setae.

Genitalia ( Fig. 8 ). Gonocoxite with 1–6 setae. Tergite IX with about 65–110 setae. Segment X with 13–18 setae. Cercus 184–225 µm long. Seminal capsule 154–165 µm long, 75 µm wide. Notum 244–259 µm long.

Remarks

Lundström recorded 2 males and 3 females of this species from Lake Ketalach. In the collection, however, there are four females (one without abdomen) and no male. Although Lundström (1910) had earlier reported C. lugubris from Finland, according to Lindeberg (1959) his material is not conspecific with Zetterstedt's type material. Zetterstedt's type series contained females. These should be analysed in the same detail as the Lundström females before conclusions can be drawn on whether or not they are conspecific.

Figures

FIGURES 1 – 10. Chironomus (Chironomus) spp., imagines, 1: C. lundstroemi sp. n., hypopygium, 2 – 6: frontal tubercles and frons, 2: C. lundstroemi sp. n., female, 3 – 4: C. trabicola Shobanov, Wülker & Kiknadze, female and male, 5: C.? lugubris Zetterstedt, female, 6: C. flavoviridis Lundström, female, 7 – 10: female genitalia, apodeme lobe (shown separately), dorsomesal and ventrolateral lobes, 7: C. lundstroemi sp. n., 8: C.? lugubris Zetterstedt, 9: C. flavoviridis Lundström, 10: C. trabicola Shobanov, Wülker & Kiknadze.