Polypedilum (Uresipedilum) dissimilum Yamamoto & Yamamoto, 2015, sp. nov

Polypedilum (Uresipedilum) dissimilum sp. nov. (Figs. 7���10) Type material. Holotype male (No. OPU-NY 501). Japan, Hokkaido, Monbetsu-gun, Kamiyubetsu, 9. ix. 2008, Y. Yamaguchi. Diagnosis. The species resembles P. convictum (Walker, 1856) in general appearance and the structure of the male hypopygium. However, it is easily distinguished by having a IX tergum with T-shaped tergal band which is unique to species. Etymology. From Latin dissimilis, differ, referring to shape of tergal band differing from any other member of subgenus Uresipedilum. Male (n= 1). Total length 2.8 mm. Wing 1.6 mm long. 0.5 mm wide; wing length / wing width 3.20. Coloration. Predominantly pale yellow except lateral vittae of scutum, medioanepisternum II and preepisternum II pale brown. Head. Temporal setae 12. AR 1.58. Palpomere lengths (in ��m): 40, 40, 112, 100, 176; palpomeres with 1, 4, 13, 11, 9 setae, respectively. Clypeus with 11 setae. Cibarial pump 40 ��m long, weakly developed. Thorax. Lateral antepronotal seta absent; dorsocentrals 12 including no humerals, uniserial; acrostichals 10, biserial, beginning just behind antepronotum; prealars 5, uniserial; supraalars 0. Scutellum with 15 setae, biserial. Wing (Fig. 7). VR 1.21. Brachiolum with 1 median seta; with 8 basal, 3 median, 11 subapical sensilla campaniformia. R, R 1 and R 4 + 5 with 18, 13, 22 setae, respectively. Legs (Figs. 8���9). Fore tibia with apical rounded scale without spine. Fore, mid and hind coxae with 3, 6, 3 setae, respectively; fore, mid and hind trochanters with 8, 5, 8 marginal setae, respectively. Lengths and proportions of legs as in Table 2. Hypopygium (Fig. 10). Tergum IX with T-shaped tergal band and with 2 median setae. Anal point long and slender, slightly constricted at middle, with rounded apex. Superior volsella with basal portion wide and its outer portion slightly produced posteriorly, bearing microtrichia on dorsolaterally, and with 1 long setae on its outer portion of posterior margin, with bare short projection. Inferior volsella rather wide and strongly constricted at outer margin of apical 1 / 4, not reaching the tip of anal point, with 17 setae on apical 1 / 3 of which the apical one is long and extending posteriorly. Sternapodeme narrow, without anterolateral projection, with anterior margin nearly 1 / 4 as wide as gonocoxite width. Gonocoxite with 5 uniserially arranged setae on its inner margin. Gonostylus long, lunate, with 8 setae on inner margin of apical 2 / 3. Distribution. Japan (Hokkaido).
Published as part of Yamamoto, Nao & Yamamoto, Masaru, 2015, A revised subgeneric position for Polypedilum (Probolum) simantokeleum, with description of a new Uresipedilum species in Japan (Diptera: Chironomidae), pp. 439-445 in Zootaxa 3999 (3) on page 442, DOI: 10.11646/zootaxa.3999.3.9, http://zenodo.org/record/232832