Neozavrelia yakuefea ( Sasa, Suzuki, 2000 )

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 : 289-293

Neozavrelia yakuefea ( Sasa, Suzuki, 2000)

( Figs 120–131 )

Cladotanytarsus yakuefeus Sasa, Suzuki, 2000: 60 , Fig. 12 a–k

Neozavrelia yakuefea ( Sasa, Suzuki, 2000) , Giłka 2012: 39

Tanytarsus ginzanlemeus Sasa, Suzuki, 2001: 19 , Fig. 21 a–k, syn. nov.

Material examined. 1 male, RUSSIA, PRIMORYE TERRITORY, Ussuri region, Krounovka River , 21.vii.2004 , leg. T. Vshivkova; 2 mature pupae, same data, Samarga River, 100 m above the mouth of the Puha River , 30.vii.2006, leg. O. Zorina ; 2 mature pupae, KHABAROVSK TERRITORY, Amur district, Amur River basin, Shokma River, Dirga River tributary, railway bridge, N 49003’12.7, E 135007’40.5, 31.viii.2010 , leg. T. Tyunova ; 1 male, AMUR REGION, basin of the Bureysky Reservoir, Kuzmichiha River , 9 km from the estuary, 21.vii.2005, leg. E. Makarchenko ; 1 male, same data, Sinal River , 27.vi.2013, leg. O. Zorina.

Description. Adult male (n=3) pale yellow. Total length 1.7–1.9 mm; wing length 1.3–1.4 mm. Total length/ wing length 1.21–1.46.

Head ( Figs 120 , 123–124 ). Frontal tubercles absent, frontal lobes swollen. Temporal setae 7–9. Clypeus with 12–15 setae. Antenna with 10 flagellomeres, 640–760 μm long; ultimate flagellomere 184–320 μm, swollen apically. AR 0.40–0.73. Maxillary palpomeres 2–4 combined 401–449 μm long, their individual lengths (in μm): 41–51: 82–88: 105–119: 170–190. Antenna length/palp length 1.60–1.83.

Thorax. Acrostichals 10–12, dorsocentrals 5–8, prealars 1. Scutellum with 4–9 setae.

Wing width 0.44–0.46 mm. VR 1.31–1.46. R with 9–17, R 1 with 3–7, R 4+5 with 5–7, M 1+2 with 16–25, M 3+4 with 5–16, Cu 1 with 0–2 setae. Cell r 2+3, r 4+5, m 1+2 with setae. Brachiolum with 1 seta.

Legs (see Table 17). Apical curved tibial spur of fore leg 31–41 μm long. Combs of mid and hind tibiae separated; each comb bears straight or slightly curved spur, 20–27 μm (mid tibia) to 24–37 μm long (hind tibia). Basitarsus of mid leg without sensilla chaetica.

Hypopygium ( Figs 121 , 125–126 ). Anal tergite with V-shaped bands and posterolateral lobes 17 μm long in dorsal view; anterior margin straight. The anal point stout, parallel-sided, rounded apically, dorsally cover with several small spinulae and bearing 7–9 lateral setae on each side of anal point, 27–34 μm long and 17 μm wide on dorsal view. Gonocoxite 119–122 μm long, along the inner margin with 4–5 setae. The width of the transverse sternapodema 41–51 µm. Superior volsella oval-shaped (34–51 μm long, 14 μm wide), bearing 2–3 strong apical and 4–5 fine dorsal setae, microtrichia absent. Digitus 24–34 μm long and 10 μm wide. Stem of median volsella straight and parallel-sided, 24–37 μm long, bearing slender lamelliform setae; total length of median volsella 51–58 μm. Inferior volsella curved and rounded apically, 102–119 μm long, with 12–15 setae. Gonostylus straight, 78–88 μm long and expanded at about proximal 1/3 (27–41 μm). HR 1.39–1.52.

Pupa (n=2, male, female).

Cephalothorax ( Figs 122 , 127–128 ). Cephalic tubercles weakly developed, frontal setae lost. Thoracic horn elongate, 280 μm long, 51 μm wide, without spines; base of thoracic horn oval-shaped 41 μm long, 17 μm wide. Antepronotals 2 (1 median 85 μm long and 1 lateral 85 μm long). Precorneals 3 (1st 85 μm long, 2nd 75 μm long, 3rd 51 μm long). Dorsocentrals 4 (51–68 μm long); distance between Dc2 and Dc3 190 μm. Prealar tubercles rounded. Wing sheath usually with a well-developed “nose”.

Abdomen 1.2–1.8 mm long ( Figs 129–131 ). Hook row 306–344 μm long with 95 spines on tergite II. Tergites II–VI with a pair of longitudinal rounded and oval patches of dark spines on anterior part and shagreen in the anterolateral corners. Length longitudinal patches on tergites II–VI (in μm): 68–71: 71–75: 85–92: 88–102: 119. Tergites VII–IX with a pair bands of pale shagreen in proximal part. Comb of segment VIII 51 μm wide, with dark 7–9 apical and 12–15 dorsal tooth. Anal segment 170 μm long and 170–204 μm wide, each anal lobe with dark strong spines on posterior third and 4–6 brown lamelliform setae. Conjunctives of II–VI segments with double setae sometimes one of them plumose. Segments II–VII with 2–3 simple L setae, VIII withouit seta, IX with 3 pair lamelliform setae dorsally.

Larva unknown.

Remarks. The males of N. yakuefea (Sasa, Suzuki) differ well from all known species of the genus Neozavrelia by the following combination of characters: body color is light yellow, the last segment of the antenna is short and apically widened, frontal tubercles are absent, sensilla chaetica on ta 1 P 2 are absent (except for N. paramushirica sp. nov.), the anterior margin of tergite IX is straight. When comparing photographs and the morphological description of males of N. yakuefea ( Sasa, Suzuki, 2000) and N. ginzanlemeus ( Sasa, Suzuki, 2001) (http://www. type.kahaku. go.jp/TypeDB/mediaDetail?cls=diptera&pkey=diptera-000888&lCls=m_diptera&lPkey=275801&detaillnkIdx=0) from Japan and the Russian Far East, we did not find significant differences (see Table 18). Therefore, we believe that Neozavrelia ginzanlemeus ( Sasa, Suzuki, 2001) is a junior synonym Neozavrelia yakuefea ( Sasa, Suzuki, 2000) .

The pupa of N. yakuefea (Sasa, Suzuki) is well distinguished by the elongated fusiform shape of the thoracic horn and the oval shape of its base, the presence of setae on the conjunctiva of segments II–VI, the presence of 4–6 setae on the anal lobe, and the presence of 95 hook-shaped spines on tergite II.

Distribution. Russian Far East (Primorye Territory, Amur Region), Japan.

Figures

FIGURES 120–122. Details of the structure of hypopygium the male of Neozavrelia yakuefea (Sasa, Suzuki, 2000). 120— maxillary palp; 121—total view of hypopygium, dorsal view; 122—thoracic horn. Scale bar 50 μm.

FIGURES 123–126. The male of Neozavrelia yakuefea (Sasa, Suzuki). 123—head and maxillary palps; 124—antenna; 125– 126— hypopygium. Scale bar 50 μm.

FIGURES 127–131. Details of the structure of pupa of Neozavrelia yakuefea (Sasa, Suzuki). 127—thorax; 128—thoracic horn; 129—tergites II–IX; 75—lateral setae on segments III–IV; 130— anal combs and tergite IX. Scale bar 50 μm.

FIGURES 9–22. Details of the structure of the male of Neozavrelia kedrovaya sp. nov. 9—maxilar palp; 10—total view of hypopygium; 11, 12—anal point; 13—superior volsella; 16–18—gonostylus and inferior volsella; 19–21—tergite IX, lateral view; 22—thoracic horn. Scale bar 50 μm.