Tokunagaia kurodeea (Sasa)

Liu, Yuedan & Wang, Xinhua, 2006, Tokunagaia Saether from China (Diptera: Chironomidae: Orthocladiinae), Zootaxa 1183, pp. 43-56 : 47-53

Tokunagaia kurodeea (Sasa)

( Figs. 4–6 )

Hydrobaenus kurodeeus Sasa, 1996: 19 , fig. A2.

Tokunagaia kurodeea (Sasa) ; Yamamoto 2004: 106.

Material examined

CHINA: Sichuan Province, Garzê County, Yajiang County , (30°02’N, 101°01’E), 2830 m a.s.l., 2 males, 14.vi.1996, light trap, X. Wang ; Yunnan Province, Dali City, Zhonghe , (26°10’N, 101°25’E), 2300 m a.s.l., 1 male, 22.v.1996, light trap, X. Wang .

Distribution Previously only recorded from Japan. The Chinese specimens were collected in light traps in the Sichuan and Yunnan Provinces in Southwest China (Oriental Region).

Tokunagaia quadrulata new species

( Figs. 7–9 )

Type material

Holotype male. CHINA: Sichuan Province, Litang County, Cogsum , (29°42’N, 100°22’E), 4170 m a.s.l., 11.vi.1996, sweep net, X. Wang (BDN no.11484) . Paratypes: 6 males as holotype.

Etymology From Latin, quadrula, square and – atus, provided with, referring to the quadrangular inferior volsella.

Diagnostic characters

The new species is similar to T. obriaini Hayes and Mürray , but can be separated by having an AR of 0.50–0.69, compared to AR of 1.07–1.57 in T. obriaini , and tergite IX with 8–10 long setae, compared to 11–17, 14 long setae in T. obriaini . It can be differentiated from another similar species, T. rectangularis (Goetghebuer) , by having a prominent crista dorsalis.

Description

Male (n = 7)

Total length 2.20–2.78, 2.45 mm. Wing length 2.05–2.23, 2.15 mm. Total length/wing length 1.07–1.28, 1.14. Wing length/length of profemur 2.33–2.59, 2.45. Coloration [slide mounted material]: head dark brown, thorax brown with dark brown vittae, wings light brown, abdominal segments and legs light brown.

Head. AR 0.50–0.69, 0.55. Temporal setae 4–7, 5; including 1–3, 2 inner verticals, 1–3, 2 outer verticals, and 1–3, 2 postorbitals. Clypeus with 3–4, 3 setae. Tentorium 128–153, 139 µm long. Palpomere lengths (in µm): 35–44, 38; 33–48, 44; 90–103, 96; 83–100, 91; 138–151, 143.

Thorax. Antepronotum with 1–5, 3 setae; acrostichals 3–11, 9; dorsocentrals 4–6, 5. Scutellum with 1–5, 3 setae.

Wing ( Fig. 7 ). Anal lobe rounded. VR 1.07–1.11, 1.09. R 2+3 ends 1/3 distance between R 1 and R 4+5. Costal extension 25–45, 29 µm long. Brachiolum with 1–2, 1 setae; R with 2–3, 3 setae; R 4+5 with 1–3, 2 setae; remaining veins bare. Squama with 4–6, 5 setae.

Legs. Spur of front tibia 35–43, 39 µm long, without denticles. Spurs of mid tibia 11–30, 21 µm and 11–30, 23 µm long; of hind tibia 45–50, 47 µm and 18–20, 19 µm long; all with weak denticles. Hind tibial comb with 9–12, 11 setae. Two pseudospurs present on ta 1 and ta 2 of mid and hind legs. Lengths and proportions of legs as in Table 2.

Hypopygium ( Fig. 8 ). Tergite IX with 8–10, 8 long setae. Phallapodeme with swollen apex, 51–86, 66 µm long; transverse sternapodeme straight, 77–105, 97 µm long, with oral projection. Virga 8–10, 9 µm long, composed of cluster of 4–6, 5 spines. Gonocoxite 155–226, 172 µm long; inferior volsella rectangular, with more than 10 long setae. Gonostylus ( Fig. 9 ), 85–98, 92 µm long; with long crista dorsalis apically; megaseta 5–10, 7 µm long. HR 1.52–2.37, 1.84; HV 2.45–2.92, 2.65.

Female and immatures: Unknown.

Distribution The specimens were collected with sweep net in a subtropical mountain area in the Sichuan Province in South China (Oriental Region).

Tokunagaia rectangularis (Goetghebuer)

Orthocladius rectangularis Goetghebuer, 1940: 61 .

Eukiefferiella oestbyi Saether, 1968: 462 , fig. 26.

Eukiefferiella rectangularis (Goetghebuer) ; Brundin 1956: 89, fig. 51; Lehmann 1972: 382 –384, figs. 56­60.

Tokunagaia rectangularis (Goetghebuer) ; Halvorsen and Saether 1987: 179, fig. 1B.

Material examined CHINA: Liaoning Province, Fushun County, Duhe, Gezidong , (40°48’N, 120°12’E), 251 m a.s.l., 3 males, 29.iv.1994, light trap, X. Wang .

Distribution

The species is widespread in Europe and the Russian Far East. The Chinese specimens were collected in a light trap in the Liaoning Province in Northeast China (Palaearctic Region).

Tokunagaia spinosa new species

( Figs. 10–12 )

Type material

Holotype male. CHINA: Guizhou Province, Fanjing Mountain Natural Conservation Area, Huguo Temple , (27°55’N, 108°41’E), 1300 m a.s.l., 2.viii.2001, light trap, R. Zhang (BDN no. 14695) . Paratypes: 2 males as holotype; 1 male, Yunnan Province, Dali City , Diancangshan Mountain, Qingbixi, (25°58’N, 99°52’E), 2370 m a.s.l., 23.v.1996, light trap, B. Wang.

Etymology From Latin, spinosus, thorny, referring to the pseudospurs on ta 1 –ta 3 of mid and hind legs.

Diagnostic characters

The male differs from other known species of the genus by having pseudospurs on ta 1 –ta 3 of mid and hind legs, tergite IX with 15–19 median setae, digitiform inferior volsella and well developed crista dorsalis.

Description

Male (n = 4)

Total length 3.49–3.58, 3.53 mm. Wing length 1.65–1.88, 1.75 mm. Total length/wing length 1.90–2.14, 2.02. Wing length/length of profemur 2.20–2.21, 2.21. Coloration [slide mounted material]: head black, thorax dark brown with black vittae, wings light brown, abdominal segments and legs dark brown.

Head. AR 0.91–1.03, 0.95. Temporal setae 9–11, 10; including 3 inner verticals, 3–4, 3 outer verticals, and 3–4, 4 postorbitals. Clypeus with 9–13, 10 setae. Tentorium 184–193, 190 µm long. Palpomere lengths (in µm): 33–35, 34; 45–48, 47; 130–138, 134; 140–147, 143; 192–200, 196.

Thorax. Antepronotum with 1–3, 2 lateral setae; acrostichals 7–9, 8; dorsocentrals 13–14, 14; prealars 4–6, 5. Scutellum with 8–16, 12 setae.

Wing ( Fig. 10 ). Anal lobe protruding. VR 0.96–0.98, 0.97. R 2+3 ends 1/2 distance between R 1 and R 4+5. Costal extension 36–55, 47 µm long. R with 14–16, 15 setae; R 1 with 2–3, 3 setae; R 4+5 with 0–1, 1 setae; remaining veins bare. Squama with 8–18, 11 setae.

Legs. Spur of front tibia 68–75 (2) µm long, without denticles. Spurs of mid tibia 33–40, 37 µm and 28–33, 30 µm long; of hind tibia 68–74, 70 µm and 15–33, 22 µm long; all with weak denticles. Hind tibial comb with 12–17, 14 setae. Two pseudospurs present on ta 1 –ta 3 of mid and hind legs. Lengths and proportions of legs as in Table 3.

Hypopygium ( Fig. 11 ). Tergite IX with 15–19, 17 long setae. Phallapodeme hooked, 58–69, 64 µm long; transverse sternapodeme 95–105, 100 µm long, with oral projections. Virga 9–12, 10 µm long, composed of cluster of 8–11, 10 spines. Gonocoxite 200–243, 223 µm long; inferior volsella digitiform, with 15–18, 16 long setae. Gonostylus ( Fig. 12 ), strongly curved, 90–98, 94 µm long, with crista dorsalis; megaseta 8–13, 10 µm long. HR 2.22–2.56, 2.36; HV 3.56–3.92, 3.75.

Female and immatures: Unknown.

Distribution The specimens were collected in light traps in Guizhou and Yunnan Provinces in Southwest China (Oriental Region).

Figures

FIGURES 1–6. Tokunagaia fasciata new species (Holotype) (1–3), and Tokunagaia kurodeea (Sasa) (Chinese specimen no. 11484) (4–6). 1 & 4, wing. 2 & 5, hypopygium. 3 & 6, gonostylus.

FIGURES 7–12. Tokunagaia quadrulata new species (Holotype) (7–9), and Tokunagaia spinosa new species (Holotype) (8–12). 7 & 10, wing. 8 & 11, hypopygium. 9 & 12, gonostylus.