Polypedilum (Uresipedilum) dissimilum, Yamamoto, Nao & Yamamoto, Masaru, 2015

Yamamoto, Nao & Yamamoto, Masaru, 2015, A revised subgeneric position for Polypedilum (Probolum) simantokeleum, with description of a new Uresipedilum species in Japan (Diptera: Chironomidae), Zootaxa 3999 (3), pp. 439-445 : 442

publication ID	https://doi.org/ 10.11646/zootaxa.3999.3.9
publication LSID	lsid:zoobank.org:pub:400990AC-B38E-4F28-B525-BD05093796C1
DOI	https://doi.org/10.5281/zenodo.5618509
persistent identifier	https://treatment.plazi.org/id/C13087D3-FF86-6022-37A8-FEC29042F97A
treatment provided by	Plazi
scientific name	Polypedilum (Uresipedilum) dissimilum
status	sp. nov.

Treatment

Polypedilum (Uresipedilum) dissimilum View in CoL sp. nov.

( Figs. 7–10 View FIGURES 7 – 10 )

Type material. Holotype male (No. OPU-NY501). 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 Μm): 40, 40, 112, 100, 176; palpomeres with 1, 4, 13, 11, 9 setae, respectively. Clypeus with 11 setae. Cibarial pump 40Μm 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 View FIGURES 7 – 10 ). VR 1.21. Brachiolum with 1 median seta; with 8 basal, 3 median, 11 subapical sensilla campaniformia. R, R1 and R4+5 with 18, 13, 22 setae, respectively.

Legs ( Figs. 8–9 View FIGURES 7 – 10 ). 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 View TABLE 2 .

Hypopygium ( Fig. 10 View FIGURES 7 – 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).