Chironomus (Chironomus) circumdatus (Kieffer, 1916)

Yamamoto, Nao & Yamamoto, Masaru, 2018, Taxonomic information on some Japanese Chironomidae (Diptera) described by Dr. M. Sasa (†), Zootaxa 4514 (4), pp. 516-528 : 518-519

Chironomus (Chironomus) circumdatus (Kieffer, 1916)

( Figs. 7–9 )

Tendipes circumdatus Kieffer, 1916: 110 .

Chironomus circumdatus: Sasa (1978: 11)

Chironomus daitoefeus Sasa et Suzuki, 2001b: 66 . syn. n.

Specimens examined: Japan: Ryukus, Okinawa Pref., Minamiadaito Is., Hyotan-ike Pond , holotype ♂ of Chironomus daitoefeus , 29. iii. 2001, H. Suzuki, [specimen No. 412:094 (NSMT-I-Dip 5 433)] .

Chironomus circumdatus is characterized by the following combination of characters: AR 3.13-3.54; scutal vittae darkened on their outer and inner margins; distal ends of tarsomeres 1–4 and tarsomere 5 of all legs brown; LR 1 1.65-1.68; abdominal tergites 2–5 each with large oval spot on meson; superior volsella long, slender, nearly parallel-sided, strongly tapered at tip and strongly hooked ventrally. These characters are completely consistent with those of C. daitoefeus .

Figures

FIGURES 6–9. Two chironomid species, male imagines. 6, Smittia nudipennis (Goetghebuer) (holotype of Bryophaenocladius togatenuis Sasa et Okazawa), hypopygium; 7–9, Chironomus circumdatus Kieffer (holotype of Chironomus daitoefeus Sasa et Suzuki), mesonotum, dorsal aspect (7), hypopygium (8), superior volsella (9).