Demicryptochironomus (Demicryptochironomus) ginzancedeus Sasa et Suzuki, 2001

Yan, Chuncai, Saether, Ole A., Jin, Zhaohui & Wang, Xinhua, 2008, Three new species of the Harnischia complex from the Sino-Indian Region, with a review of Demicryptochironomus Lenz (Diptera: Chironomidae), Zootaxa 1968, pp. 1-22 : 7

Demicryptochironomus (Demicryptochironomus) ginzancedeus Sasa et Suzuki

( Figs 7–12)

Demicryptochironomus ginzancedeus Sasa et Suzuki, 2001: 11 .

Parachironomus inageheus Sasa, Kitami et Suzuki 2002: 6 . Syn. n.

Material examined. Holotype male of Demicryptochironomus ginzancedeus Sasa et Suzuki ( NSM No. 403: 10), JAPAN: Hokkaido, Ginzan , 2.ix.2000, light trap, H. Suzuki . Holotype male of Parachironomus inageheus Sasa, Kitami et Suzuki ( NSM No. 402: 63), JAPAN: Inawashiro Lake , 21.ix.2000, light trap, K. Kitami .

Diagnostic characters. The species is easily distinguished from other known species of the genus by having inferior volsella with bare caudal projection with 1–3 setae; digitiform superior volsella with 2 setae, and prominent frontal tubercles.

Male ( Figs 7–9). As in Sasa and Suzuki (2001: 11) with the following corrections and additions: Frontal tubercles absent. R with 22 setae, R 1 with 21 setae, R 4+5 with 32 setae. Midleg without sensilla chaetica. Tergite IX with 41 setae. Laterosternite IX with 7 setae. Anal tergite bands V-shaped. Phallapodeme 130 µm long. Transverse sternapodeme 45 µm long. Superior volsella digitiform, with 2 setae. Inferior volsella covered with microtrichia in basal 1/2, with bare caudal projection with 1–3 long setae. Gonocoxite 150 µm long, inner margin with 7 strong setae. Gonostylus 200 µm long, swollen basally, tapering towards apex, inner margin with 11 setae. HR 0.75; HV 2.43.

Remarks. We also re-examined the holotype male of Parachironomus inageheus Sasa, Kitami et Suzuki. The description of the male is as in Sasa et al. (2002: 6) with the following corrections and additions: R with 27 setae, R 1 with 22 setae, R 4+5 with 35 setae. Mid ta 1 with 2 sensilla chaetica. Tergite IX with 29 setae. Laterosternite IX with 5 setae. Anal tergite bands V-shaped. Phallapodeme 87 µm long. Transverse sternapodeme 41 µm long. Superior volsella digitiform, with 1 apical seta and 1 subapical seta. Inferior volsella covered with microtrichia in basal 1/2, with bare caudal projection with 1–2 long setae. Gonocoxite 145 µm long, inner margin with 5 strong setae. Gonostylus 210 µm long, swollen basally, tapering towards apex, inner margin wiht 17 setae. HR 0.69; HV 2.30. Wing and hypopygium as in Figs 10–12.

Parachironomus inageheus Sasa, Kitami et Suzuki should be transferred to Demicryptochironomus . Parachironomus species have a distinct preapical tooth and conspicuous setal pits on the superior volsella, while P. inageheus is lacking both. The species is identical to Demicryptochironomus ginzancedeus Sasa et Suzuki in most characters except for the presence of frontal tubercles and sensilla chaetica on midleg. We consider this as intraspecific variation and thus place Parachironomus inageheus as a junior synonym of Demicryptochironomus ginzancedeus Sasa et Suzuki.

Distribution. The species is recorded from Japan.