Neozavrelia fengchengensis Wang, Wang, 1996

Orel, Oksana V., 2021, Revision of the genus Neozavrelia Goetghebuer, Thienemann, 1941 (Diptera Chironomidae) from Eastern Siberia and the Russian Far East, with the description of new species, Zootaxa 4938 (3), pp. 251-297 : 254-257

Neozavrelia fengchengensis Wang, Wang, 1996

( Figs 1–8 )

Neozavrelia fengchengensis Wang, Wang, 1996: 121 , Fig. 1 ; Guo & Wang 2005: 189; Makarchenko et al. 2005: 414; Orel 2016: 193.

Material examined. 10 males, RUSSIA, PRIMORYE TERRITORY, Olginsky district, Milogradovka River 12 km above of Listvennoe Village , 13.vi.1998, leg. T. Tiunova ; 22 males, Partisan district, basin of the Partizanskaya River near of Lozovy Klyuch Village , 29.iv.2004, leg. T. Vshivkova ; 27 males, Ussuriysk district, basin of the Razdolnaya River, Krounovka River above the hunting base, 21.vii.2004, leg. T. Arephina ; 1 male, KHABAROVSK TERRITORY, Khor River, Potopilikha channel, 3 km from Georgievka Village , 14.vii.2005, leg. T. Tiunova ; 7 males, AMUR REGION, Bureya River below of Kulikovka Village , 22.viii.2004, leg. T. Tiunova ; 6 males, basin of Zeya River, Tu River , 10.ix.2007, leg. T. Tiunova ; 25 males, CHITA REGION, Chornaya River, 500 m below the bridge of the Khabarovsk-Chita highway, 26.vii.2005, leg. T. Tiunova ; 10 males, Nercha River above the Znamenka Village , 27.vii.2005, leg. T. Tiunova .

Description. Adult male (n=7). Total length 2.3–2.6 mm; wing length 1.6–1.7 mm. Total length/wing length 1.08–1.27.

Colouration. Ground colour of thorax, scutellum, maxillary palpomeres and abdomen brown; halters yellowish; antenna, scutal stripes, median band on distal half of mesonotum and postnotum, legs dark brown.

Head ( Figs 1–3 ). Frontal tubercles very small, about 2 μm in diameter ( Fig. 1 ). Temporal setae 8–13. Clypeus with 16–21 setae. Antenna with 10 flagellomeres, 806–845 μm long; ultimate flagellomere 312–390 μm ( Fig. 3 ). AR 0.82–0.88. Maxillary palpomeres 2–4 combined 380–410 μm long, their individual lengths (in μm): 40–50: 75–85: 100: 165–175 ( Fig. 2 ). Antenna length/palp length 2.06–2.19.

Thorax. Acrostichals 10–13, dorsocentrals 6–8, prealars 1. Scutellum with 7–8 setae.

Wing width 0.49–0.51 mm ( Fig. 4 ). VR 1.13–1.21. R with 5–9 setae, R 1 without setae, R 4+5 with 2–3 apical setae, M 1+2 with 18–27 setae, M, Cu 1, An without setae. Cell r 2+3, r 4+5, m 1+2 with setae. Brachiolum with 1 seta.

3+4

Legs (see Table 1). Apical curved tibial spur of fore leg 30 μm long. Combs of mid and hind tibiae separated; each comb bears straight or slightly curved spur, 24–30 μm (mid tibia) to 41–51 μm long (hind tibia). Basitarsus of mid leg with 2–5 sensilla chaetica.

Hypopygium ( Figs 5–8 ). Anal tergite with posterolateral lobes 12 μm long; anterior margin triangular-shaped. The anal point narrow, parallel-sided, expanded medially, dorsally cover with several small spinulae and bearing 16–18 lateral setae on each side of anal point, 30–32 μm long and 10 μm wide on dorsal view. Gonocoxite 120–130 μm long, along the inner margin with 4–6 setae. The width of the transverse sternapodema 46 µm. Superior volsella oval-shaped (32–34 μm long, 20 μm wide), bearing 2–3 strong apical and 6–8 fine dorsal setae, microtrichia present. Digitus 20 μm long and base of digitus triangular, 20 μm long. Stem of median volsella 26–30 μm long, bearing slender lamelliform setae; total length of median volsella 60 μm. Inferior volsella foot-shaped apically in lateral view, 84–90 μm long, with 15–18 setae. Gonostylus 90–100 μm long and expanded at about median. HR 1.20–1.44.

Pupa and larva unknown.

Remarks. When comparing males from different regions of East Asia, slight morphological differences were revealed (see Table 2). Chinese specimens turned out to be slightly larger than the Far Eastern and South Korean ones. In Far Eastern males, the 4th segment of the maxillary palp is much longer than the 3rd, whereas in Chinese and South Korean males, the 3rd and 4th segments are the same length. The AR value ranges from 0.75 (Southern Korea) to 1 ( Chine).

The male of N. fengchengensis Wang, Wang differs from all known species in the following combination of characters: the number of setae on the veins of the wings (R with 5–9 setae, R 1 without setae, R 4+5 with 2–3 apical setae, M 1+2 with 18–27 setae, M 3+4, Cu 1, An without setae), anal point narrow and expanded medially, digitus protrudes beyond the edge of the superior volsella and is located on a separate lobe, superior volsella dorsally covered with microtrichia, inferior volsella foot-shaped laterally.

Distribution. Chine, South Korea, Russian Far East (Primorye and Khabarovsk Territory, Amur Region) and East Siberia (Chita Region).

Figures

FIGURES 1–8. The male of Neozavrelia fengchengensis Wang, Wang. 1—frontal tubercles; 2—maxilar palp and clypeus; 3—antenna; 4—apical part of wing; 5, 6—total view of hypopygium; 7, 8—lateral view of hypopygium. Scale bar 50 μm.