Tanytarsus iriolemeus Sasa et Suzuki, 2000

Giłka, Wojciech & Gadawski, Piotr, 2022, Tanytarsini (Diptera: Chironomidae) collected during Polish expeditions to North Korea, Zootaxa 5214 (2), pp. 151-175 : 160

Tanytarsus iriolemeus Sasa et Suzuki, 2000

Tanytarsus iriolemeus Sasa et Suzuki, 2000: 20 (male, fig. 21 a–n; Japan).

( Fig. 6A–D )

Material examined. Kŭmgang-san, 28 June – 2 July 1981, 1 male; Myohyang-san, 22–25 June 1981, 2 males; leg. W. Krzemiński.

Remarks. The North Korean specimens fit well the original description of Tanytarsus iriolemeus ( Sasa & Suzuki 2000) except for one character crucial in species group concepts for Tanytarsus - the strong bristle-like median setae placed in a roundish field of the hypopygial anal tergite. This structure is omitted in the original description but present in the holotype specimen (slightly beyond the range of sharpness on the photo presented at NMNS website, 385:035). This character combined with the anal point elongate, bearing a few spinulae ( Fig. 6A, B ; cf. also Tanytarsus innarensis Brundin 1947 ), the superior volsella roundish, medially excavated, with a well-protruded posteromedian corner, the digitus long apically rounded ( Fig. 6C ), and the shape of the median volsella ( Fig. 6D ) may indicate that T. iriolemeus belongs to the verralli species group. In the analyses by Lin et al. (2018b), T. iriolemeus falls in the tamakutibasi cluster that together with the aterrimus + chinyensis + curticornis groups is sister to a clade comprising the Holarctic excavatus, recurvatus, and verralli groups.

Figures

FIGURE 6. Tanytarsus iriolemeus Sasa et Suzuki, 2000 (A–D) and T. oyamai Sasa, 1979 (E–H), males. A, F: anal tergite and anal point in dorsal view, variations; B: anal tergite, lateral view; C, G: superior volsella and digitus, variations; D, H: median volsella; E: hypopygium (F–H magnified × 1.5 relative to E).