Demicryptochironomus (Demicryptochironomus) tamacutus (Sasa) Yan & Saether & Jin & Wang, 2008

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 : 11-12

Demicryptochironomus (Demicryptochironomus) tamacutus (Sasa) comb. n.

( Figs 19–21)

Cryptotendipes tamacutus Sasa, 1983: 6 ; Yan et al. (2005: 27).

Material examined. Holotype male ( NSM No. 67: 21), JAPAN: Tama River , Okutama, 26.vi.1981.

Diagnostic characters. The species is similar to Demicryptochironomus asamaprimus Sasa et Hirabayashi in having a sheet-shaped inferior volsella covered by microtrichia. It can be separated on the tuberclelike superior volsella.

Male ( Figs 19–21). As in Sasa (1983: 6) with the following corrections and additions: Brachiolum with 2 setae, R with 28 setae, R 1 with 22 setae, R 4+5 with 32 setae. Midleg without sensilla chaetica. Tergite IX with 28 setae. Laterosternite IX with 5 setae. Anal tergite bands V-shaped. Phallapodeme 105 µm long. Transverse sternapodeme 28 µm long. Superior volsella tubercle-like, with 2–3 setae. Inferior volsella reduced, sheetshaped, covered with microtrichia. Gonocoxite 155 µm long, inner margin with 8 strong setae. Gonostylus 178 µm long, swollen medially, tapering towards apex, inner margin with 12 setae. HR 0.87; HV 2.34.

Remarks. Yan et al. (2005) suggested that the species should be placed in Demicryptochironomus based on the original description and figures. Re-examination of the holotype revealed that the base of the gonostylus of Cryptotendipes tamacutus Sasa is lacking an inner expansion. Based on the tubercle-like superior volsella and the shape of the gonostylus the species is transferred to Demicryptochironomus as a new combination.

Distribution. The species is recorded from Japan.