A review of the Japanese Cryptochironomus Kieffer, 1918 (Diptera, Chironomidae) Author Yan, Chuncai Author Liu, Ting Author Cao, Wei Author Zhao, Guangjun Author Liu, Wenbin text ZooKeys 2018 771 139 155 http://dx.doi.org/10.3897/zookeys.771.24220 journal article http://dx.doi.org/10.3897/zookeys.771.24220 1313-2970-771-139 E0070C6D62DE4AE1B87D86AC63BEC27B Cryptochironomus tamayoroi Sasa & Ichimori, 1983 Cryptochironomus tamayoroi Sasa & Ichimori, 1983: 102; Sasa and Kawai 1987 : 61 Material examined. Japan. Holotype, ♂ (No. 74: 01), Tama River, at the Yoroi Bridge, at Yoroi-bashi, Japan. 11. iii. 1982. Diagnostic characters. AR 2.56. Frontal tubercles present; tergite IX bearing three setae, posterior margin tapering. Anal point parallel-sided. Anal tergite bands "V" -shaped. Superior volsella about twice as long as wide, with four long setae; inferior volsella extending well beyond posterior margin of superior volsella. Gonostylus wider at base and tapering towards apex, with one single apical seta. Distribution. Japan.