Tanytarsus tamadecimus Sasa, 1980

Giłka, Wojciech & Gadawski, Piotr, 2022, Tanytarsini (Diptera: Chironomidae) collected during Polish expeditions to North Korea, Zootaxa 5214 (2), pp. 151-175 : 165

Tanytarsus tamadecimus Sasa, 1980

Tanytarsus tamadecimus Sasa, 1980: 26 (male, figs 28, 29; Japan).

( Fig. 8A–C )

Material examined. Hwangju, 18–19 June 1981, 2 males; Kŭmgang-san, 28 June – 2 July 1981, 3 males; Sokam, 8 July 1981, 1 male; leg. W. Krzemiński.

Remarks. The Korean specimens of Tanytarsus tamadecimus fit the original description, except for a couple of characters, possibly taken from specimens deformed before their illustrating. According to Sasa (1980), the digitus is “composed of a long spatulated dorsal process and a ventral hook-like process connected with each other”. In fact, at the Sasa’s illustrations the hook-like process looks so unusually (not known from any other species) as we assume it could be misidentified with a long darkly pigmented tubercle at the digitus base that was omitted in the original illustrations (cf. Sasa 1980, fig. 29B, F, G and Fig. 8B ). Character/shape overinterpretation seems to pertain also to the anal point and median volsella (cf. Sasa 1980, fig. 29D, E and Fig. 8A, C ), thus we attach illustrations of selected variations to supplement the description.

Tanytarsus tamadecimus and T. chinyensis are treated here as close relatives (see also remarks to T. chinyensis ). The concept of the chinyensis species group sensu Reiss and Fittkau (1971) was recently refuted and/or its species composition was suggested to be reduced ( Lin et al. 2018a, b); however, neither T. chinyensis nor T. tamadecimus have been included in the analyses. Consequently, we keep the chinyensis group, with the two species and T. cretensis Reiss, 1987 , plus T. tamagotoi Sasa, 1983 and T. simantoseteus Sasa, Suzuki et Sakai, 1998 , as it was suggested (op. cit.), plus a series of species by Sasa and co-authors: T. chuzesecundus Sasa, 1984 , T. inawaijeus Sasa, Kitami et Suzuki, 2000 , T. oyaberotundus Sasa, Kawai et Ueno, 1988 and T. tusimatkeleus Sasa et Suzuki, 1999 . Males of all the species have the broad thumb-like or spatulate digitus and the horn-like posteromedian corner of the superior volsella.

Figures

FIGURE 8. Tanytarsus tamadecimus Sasa, 1980 (A–C) and T. tamaundecimus Sasa, 1980 (D–F); males, hypopygial diagnostic structures. A, D: anal point, variations; B, E: superior volsella and digitus, variations; C, F: median volsella.