Cryptotendipes lenzi Zorina

Yan, Chuncai, Tang, Hongqu & Wang, Xinhua, 2005, A review of the genus Cryptotendipes Lenz (Diptera: Chironomidae) from China, Zootaxa 1086, pp. 1-24 : 4-6

Cryptotendipes lenzi Zorina ( Fig. 2 A–C)

Cryptotendipes lenzi Zorina, 2001: 31 .

Material examined: 9 males, CHINA: Xinjiang Autonomous Region, Habahe River, Baihualin Natural Conservation, 15–16.VII.2002, sweep net, H. Tang.

Diagnostic characters: The species is easily distinguished from other species of the genus by having the posterior margin of tergite IX with shoulders, the anal point without lateral setae, and a digitiform superior volsella with a longitudinal keel.

Male imago (n = 9, unless otherwise stated)

Total length 3.15–3.60, 3.34 mm. Wing length 1.66–1.96, 1.79 mm. Total length/wing length 1.71–1.97, 1.87. Wing length/length of profemur 2.24–2.33, 2.27.

Coloration: Thorax yellow or brown. Abdomen yellowish green or brown, femur apex of fore legs, tibiae and tarsi brown or dark brown, tarsi III–V of mid and hind legs dark brown, remainder of mid and hind legs yellowish green.

Head: AR 1.86–2.08, 2.00. Ultimate flagellomere 620–750, 671 µm long. Frontal tubercles absent. Temporal setae 5–12, 9 (7), including 1–4, 2 inner verticals, 2–5, 3 outer verticals and 1–5, 3 postorbitals. Clypeus with 6–10, 8 (7) setae. Tentorium 115–133, 115 (6) µm long, 20–30, 26 µm wide. Palpomere lengths (in µm): 32; 38; 110–130, 127; 112–135, 123; 187–195, 192. Palp segments 5th/3rd 1.34–1.77, 1.54 (3).

Thorax: Antepronotals with 1–2, 2 (5) setae, acrostichals 2–8, 6 (5), dorsocentrals 7–9, 8, prealars 2–4, 3 (8). Scutellum with 6–8, 7 setae.

Wing ( Fig. 2 A): VR 1.15–1.22, 1.18. R with 11–21, 15 setae, R1 with 9–15, 11 setae, R4+5 with 14–28, 18 setae. Brachiolum 2–3, 2 setae. Squama with 2–3, 3 setae. Anal lobe well developed.

Legs: Front tibia with 3 subapical setae, 82–90, 86 µm, 115–125, 120 µm, and 115–165,134 µm long, spurs of middle tibia 23–35, 27 µm and 30–49, 34 µm long, comb with 20–28, 24 teeth, 8–10 µm long; spurs of hind tibia 23–37, 31 µm, and 30–43, 38 µm long, comb with 30–45, 39 teeth, 8–12, 10 µm long. Sensilla chaetica absent. Lengths (in µm) and proportions of legs as in Table 2 .

Hypopygium ( Fig. 2 B, C): Tergite IX acutely constricted near shoulder­like posterior margin, with 14–18, 16 long setae on shoulder. Anal point 75–88, 86 µm long, 10–25, 14 µm wide at base, 5–8, 6 µm wide at apex, widest at base, tapering towards middle and parallel­sided in distal half, without setae, rounded at apex. Anal tergite bands Y­shaped. Laterosternite IX with 5–7, 6 setae. Phallapodeme 65–83, 75 µm long. Transverse sternapodeme 33–55, 47 µm long. Superior volsella highly developed, digitiform, bearing two long subapical setae at about distal 1/3, without microtrichia, with longitudinal “keel” and hyaline shelf at apex. Gonocoxite 100–110, 103 µm long. Gonostylus 166–200, 179 µm long, inner margin of gonostylus without distinct projection but with strong concavity inwards in middle. HR 0.52–0.65, 0.58; HV 1.65–2.00, 1.87.

Remarks: In the Chinese specimens, the superior volsella has a hyaline shelf at the apex.

Distribution: This species is distributed in the Palaearctic Region (Russian Far East). It was collected by sweep net and light trap in the northwest areas of China (Palaearctic China).

Figures

FIGURE 2. Cryptotendipes lenzi Zorina, 2001, Chinese specimen. A. Wing. B. Dorsal view of hypopygium. C. Ventral view of hypopygium.

Tables

TABLE 2. Lengths (µm) and proportion of legs of Cryptotendipes lenzi Zorina, male (n = 9).

	fe	ti	ta1	ta2	ta3	ta4	ta5	LR
p1	730­870, 790	550­650, 593	900­1070, 994	450­540, 504	350­430, 396	280­330, 308	90­150, 114	1.61­1.69, 1.66
p2	660­780, 731	550­680, 608	330­400, 357	170­210, 193	140­160, 148	80­100, 91	60­80, 66	0.52­0.62, 0.59
p3	790­990, 872	740­930, 881	490­620, 552	290­350, 316	210­300, 259	140­170, 150	70­100, 90	0.66­0.70, 0.68