Boreoheptagyia sasai Makarchenko et Endo 2008, sp. n.

• Main Authors: Makarchenko, Eugenyi A., Endo, Kazuo, Wu, Jingyang, Wang, Xinhua
• Format: Other/Unknown Material
• Language: unknown
• Published: 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Diptera; Chironomidae; Boreoheptagyia; Boreoheptagyia sasai; Kolyma; Seta; Magadan; Olen’; kolyma river
• Online Access: https://zenodo.org/record/5126518; https://doi.org/10.5281/zenodo.5126518

Boreoheptagyia sasai Makarchenko et Endo, sp. n. (Figs 26–33) Boreoheptagyia brevitarsis (Tokunaga) sensu Makarchenko (1981: 89, 1985: 38, 2006: 259). Type material. Holotype male, RUSSIA: North-Eastern Russia, Ten'kinsky County, Magadan Region, Kolyma River Basin, Vlastnyi Peak not far from Sibit-Tyellah Village, Olen' Stream, 1.100–1.300 m a.s.l., 11–27.vii.1977, E. Makarchenko & S. Kocharina (IBSS FEBRAS). Paratypes: 11 males, 4 females as holotype. 2 males, JAPAN: Hokkaido, Shintoku, Yutomuraushi River, 700 m a.s.l., Malaise trap, 11–21.vi.1999, K. Endo; 1 male, same as previous except 21.vi–2.vii.1999, Malaise trap, K. Endo; 1 male, 1 female, Hokkaido, Obihiro, Opirineppu River, 620 m a.s.l., 5–15.vi.2000, Malaise trap, K. Endo; 2 males, same as previous except 13.ix–1.x.1999, K. Endo; 1 male, same as previous except 5–15.vi.2000, Malaise trap, K. Endo. Etymology. Named in honor and memory of the famous Japanese chironomidologist and colleague Prof. Manabu Sasa. Diagnostic characters. The male is well separated from other species of the genus by the presence of setae on mesanepisternum II and preepisternum, and by the field of small spinules distal of transverse sternapodeme (Figs 30, 32). Male (n = 9) Total length 2.4–2.7 mm. Wing length 1.61–2.13 mm. Total length / wing length 1.17–1.29. Coloration. Head, thorax and legs brown to dark brown, abdomen grayish to yellowish. Head. Temporal setae includes 6–7 postorbitals, 30–31 outer verticals, and 26–31 inner verticals. Clypeus with 11–12 setae. Antenna with 13 flagellomeres, antennal plume reduced, pedicel with 4 setae. Lengths (in µm) of flagellomeres 2–13: 17–29, 25–34, 31–42, 35–46, 39–42, 34–46, 36–46, 38–55, 38–42, 38–46, 34–42, 88–101. Number of setae on flagellomeres 2–13 as: 4–5, 6, 8, 9–10, 8–9, 9–10, 8, 8–9, 8, 8, 7–8, 4. Subapical seta of terminal flagellomere 11–15 µm long. AR 0.11–0.20. Lengths (in µm) of palpomeres 1–5: 27–30, 63– 80, 101–109, 92–118, 160–193. Antennal length / palp length 1.35–1.40. Head width / palp length 1.04–1.16. ...