Chironomus (Chironomus) claggi Tokunaga, 1964

Yamamoto, Nao & Yamamoto, Masaru, 2018, Taxonomic information on some Japanese Chironomidae (Diptera) described by Dr. M. Sasa (†), Zootaxa 4514 (4), pp. 516-528 : 519

Chironomus (Chironomus) claggi Tokunaga, 1964

( Figs. 10–14 )

Chironomus claggi Tokunaga, 1964: 563 ; Sasa & Suzuki, 1997: 319.

Chironomus simantobeceus Sasa, Suzuki et Sakai, 1998: 49 . syn. n.

Specimens examined: Japan: Tokyo Metropolitan, Bonin Isles , Chichijima Is., ♂,? 14. iv. 1996; [specimen No. 307:04]; Bonin Isles, Chichijima Is., ♂, 14. iv. 1996 [specimen No. 307: 04] and Hahajima Is., ♂, 20. iv. 1996, H. Suzuki [specimen No. 308: 02] ; Kochi Pref., Nakamura, Shimanto River (near mouth), holotype ♂ of Chironomus simantobeceus , 25. v. 1998, M. Sasa [specimen No. 360:01 (NSMT-I-Dip-5222)] .

Chironomus claggi superficially resembles C. flaviplumus Tokunaga and C. yoshimatusi Martin et Sublette , but is well-separable from both these species in having much slender superior volsellae. Although the species also resembles C. cirucumdatus in the shape of the superior volsella, and the uniformly coloured scutal vittae in the former. The morphological features of C. simantobeceus are quite identical with those of C. claggi described by Tokunaga (1964). Furthermore, we observed many pseudospurs on mid and hind tarsomeres in specimen named C. simantobeceus in Sasa, Suzuki and Sakai (1998) .

This is the first record of the species from one of the main Japanese islands, Shikoku.

Figures

FIGURES 10–18. Chironomus spp., male imagines. 10–14, Chironomus claggi Tokunaga, superior volsellae (10–11, specimens identified as C. claggi by Sasa & Suzuki, specimen No. 308:02; 11, specimen No. 307:04; 12–14, holotype of Chironomus simantobeceus Sasa, Suzuki et Sakai); 12, superior volsella; 13, tarsomere 1 of mid leg; 14, tarsomere 2 of mid leg. 15–17, Chironomus riparius Meigen (holotype of Chironomus ginzanbeceus Sasa et Suzuki), 15, abdominal tergites, 16, anal point, lateral aspect, 17, superior volsella, dorsal aspect. 18, Chironomus yoshimatsui Martin et Sublette (holotype of Chironomus echizensis Sasa, superior volsella, dorsal aspect).