Paratanytarsus inopertus ( Walker 1856 )

Wang, Xinhua & Guo, Yuhong, 2005, Paratanytarsus Thienemann & Bause from China (Diptera: Chironomidae: Tanytarsini), Zootaxa 940, pp. 1-15 : 4-5

Paratanytarsus inopertus ( Walker 1856) ( Fig. 2 )

Chironomus inopertus Walker 1856: 164

Tanytarsus (Tanytarsus) inopertus ( Walker 1856) . Edwards 1929: 410 (Fig. 14d) Tanytarsus scirpeti Goetghebuer 1936: 139 . Synonymy by Reiss & Fittaku (1971) Tanytarsus humphriesae Goetghebuer 1937a: 510 . Synonymy by Brundin (1949) Tanytarsus nigriviridellus Goetghebuer 1942: 5

Paratanytarsus inopertus (Walker) Albu 1980: 267 (Fig. 180), Goetghebuer 1937b: 119, Brundin

1947: 77 (Figs. 116, 116a), Pinder 1978: 148 (Figs. 71 c, 179D), Sasa & Kamimura 1987: 22

(Plate V–k)

Material examined: 4 males (BDN 0 5091, 20231, 20232, 20233), CHINA: Inner Mongolia, Wuliangsu Lake, (40º55'N, 108º50'E), 1. v. 1982. 2 males, CHINA: Beijing City, Huairou County (39º55'N, 116º24'E). (BDN 0 6645, 06644). 15. x. 1994, X. Wang.

Diagnostic characters: Superior volsella roughly square with straight median margin. Digitus with pointed apex. Median volsella with normal apical setae at 90º to volsella. Apex of inferior volsella not branched into 2 lobes.

Male imago (n = 6)

Total length 2.92–3.36, 3.17 mm; wing length (n = 4) 1.60–2.00, 1.81 mm. Total length/wing length 1.60–2.00, 1.76; wing length/length of profemur 2.29–2.41, 2.33. Ground coloration yellow, thorax with brown vittae, legs and wing brown, abdominal tergites I–V brown, VI–VIII yellowish green.

Head: Frontal tubercles prominent, cylindrical, about 8–15, 13 µm high. AR 1.13– 1.32, 1.22; ultimate flagellomere 472–584, 536 µm long. Temporal setae (n = 5) including 5–7, 6 inner verticals, 2–6, 4 outer verticals and 0–5, 3 postorbitals. Clypeus with 12–17, 15 setae. Tentorium (n = 3) 120–136, 127 µm long, width 20–36, 30 µm. Palpomere lengths (n = 5) (in µm): 24–34, 29; 34–50, 41; 102–120, 108; 108–120, 112; 167–214, 191.

Wing: (n = 4) VR 1.09–1.24, 1.17 and Cu length 696–1000, 868 µm.

Thorax: Acrostichals 14–18, 16; dorsocentrals 11–14, 13; scutellars 7–8, 8; prealars 0–2, 1.

Legs: Front tibial spur about 10 µm long. The spurs of middle tibia are 20–22, 21 and 14–18, 16 µm, of hind tibia 20–26, 22 and 18–24, 20 µm long. The combs of middle tibia composed of 14–16, 15 and 9–15, 12 teeth, of hind tibia 18–20, 19 and 12–16, 14 teeth. Lengths (in µm) and proportion of legs are given in Table 2.

fe ti ta1 ta2

P1 696–728 504–536 720–730 368–384 P2 704–736 570–608 336–350 184–208 P3 816–848 760–800 504–544 320–336

ta3 ta4 ta5 LR

P1 320–328 230–240 110–112 1.36–1.43 P2 152–168 96–104 64–72 0.58–0.59 P3 280–360 176 80–96 0.66–0.68

Hypopygium ( Fig. 2 ): Anal tergite bands narrowly separated in the middle and extend almost to base of anal point. Anal tergite with 3 or 4 long setae mesally between anal tergite bands. Anal point broad, about 28–38, 34 µm long, with 1 pair of anal crests and 6–11, 9 basal setae. Phallapodeme 60–70, 56 µm long. Transverse sternapodeme 26–50, 36 µm long, with oral projections. Gonocoxite 106–150, 130 µm long. Superior volsella roughly square, with 5–7, 6 dorsal and 2–4, 3 inner surface setae, and 1 setae at base arising on ventral side. Digitus tapering to sharply pointed apex and extending past superior volsella about 10 µm. Median volsella about 36–54, 45 µm long, its lateral margin without setae, inner margin with about 5–9, 7 setae and apical half with bundles of lamellae at 90º to volsella. Inferior volsella 70–82, 77 µm long, with about 12–19, 16 apical setae. Gonostylus 124–147, 130 µm long. HR 0.79–1.11, 1.00; HV 2.18–2.58, 2.39.

Remarks: According to Sasa & Kamimura (1987) and Edwards 1929, the color of this species is variable. The coloration of the specimen from China is different from that of other specimens described previously.

Distribution: This species is widely distributed in Europe and Asia and is also recorded from North Africa, thus having a Palaearctic distribution.

Figures

FIGURES 1 – 4. 1. Hypopygium of Paratanytarsus dissimilis (Johansen). 2. Hypopygium of Paratanytarsus inopertus (Walker). 3. Hypopygium of Paratanytarsus paralauterborni sp. n. 4. Hypopygium of sp. A.