Paratanytarsus

Wang, Xinhua & Guo, Yuhong, 2005, Paratanytarsus Thienemann & Bause from China (Diptera: Chironomidae: Tanytarsini), Zootaxa 940, pp. 1-15 : 7-8

Paratanytarsus sp. A ( Fig. 4 )

Material examined: 1 male (BDN 06672), CHINA: Beijing City, Huairou County, (39º55'N, 116º24'E), 15. x. 1994, X. Wang.

Diagnostic characters: Median tergite setae of anal tergite not divided into 2 groups. Superior volsella roughly trapezoidal. Apical lobes of inferior volsella dilated. Inferior volsella divided into 2 lobes. Lamellae of median volsella curved.

Male imago (n = 1)

Total length 3.66 mm; wing length 2.16 mm. Total length/wing length 1.69; wing length/length of profemur 2.40. Thorax dark brown; abdomen yellowish brown; head pale and antenna; wing and legs brown; eyes black.

Head: AR 1.29. Ultimate flagellomere 620 µm long. Temporal setae 12 including 5 inner verticals, 5 outer verticals and 2 postorbitals. Clypeus with 15 setae. Tentorium 140 µm long, width 42 µm. Palpomere lengths (in µm): 32; 58; 132; 122; 206.

Wing: VR 1.12 and Cu length 1000 µm.

Thorax: Acrostichals 2; dorsocentrals 7; scutellars 5; prealars 1.

Legs: Front tibial spur 20 µm long. Spurs of middle tibia 24 and 23 µm, of hind tibia 30 and 20 µm long. Combs of middle tibia composed of 18 and 15 teeth, of hind tibia 30 and 20 teeth. Lengths (in µm) and proportion of legs are given in Table 4.

fe ti ta1 ta2 ta3 ta4 ta5 LR P1 900 490 1000 512 390 304 144 2.04 P2 880 740 424 256 208 128 90 0.57 P3 1104 976 664 410 304 200 110 0.68 Hypopygium ( Fig. 4 ): Anal tergite bands narrowly separated in middle, extending to anal crest. Anal tergite with 3 long median tergite setae between anal tergite bands. Anal point broad, 32µm long, with pair of anal crests and 6 basal setae, about 2 between crests and 2 lateral to each. Phallapodeme 44 µm long. Transverse sternapodeme 22 µm long, with oral projections. Gonocoxite 164 µm long. Superior volsella roughly trapezoidal, with 6 dorsal and 3 inner surface setae, and 1 seta at base arising on ventral side. Digitus extending beyond superior volsella, about 12 µm long and gradually tapering to rounded apex. Median volsella 90 µm long, its lateral margin without lamellae, inner margin with about 7–9 setiform lamellae and apical half with bundles of spatulate lamellae at about 60º to volsella. Inferior volsella 108µm long, distal part divided into 2 lobes and with about 20 apical setae. Gonostylus 168µm long. HR 0.98; HV 2.18.

Remarks: Among the known species of the genus, this species resembles P. tenuis (Meigen) in the hypopygium. However, it can be separated from the latter by having only one group of middle setae and no lateral teeth on the anal tergite and by the inferior volsella less deeply divided into two lobes. The lamellae of the median volsella are curved in this species. The present species was sufficiently unique to justify a new species of Paratanytarsus . However, as we have only one male specimen, we temporarily treat it as an unnamed species.

Distribution: This species is known only from Beijing City (Palaearctic Region).

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.