Chaetocladius piger (Goetghebuer)

(Fig. 18)

Dactylocladius piger Goetghebuer, 1913: 157, Figs. 8–9.

Chaetocladius piger (Goetghebuer); Goetghebuer 1940 -50: 62 (as subgenus of Orthocladius); Pankratova 1970: 234; Caldwell

1997: 118; Langton & Pinder 2007: 34, Fig. 143, A; Ashe & O’Connor 2012: 174. Hydrobaenus (Chaetocladius) stamfordi Johannsen, 1947: 171; Cranston et al. 1989: 267, Fig. 9.13, A. Chaetocladius oliveri S ӕther, 1969: 93.

Remarks. Chaetocladius piger, known from many sites in the Palaearctic and Nearctic regions, but is recorded for the first time for the Amur River basin and for the Russian Far East. The male from our material fits the description of this species and has following main features. Total length 3.9 mm. Wing length 2.32 mm. Total length/wing length 1.68. AR 1.54. Thorax brown. Acrostichals 19, dorsocentrals 9, prealars 6, scutellum with 11 setae. LR1 0.67. Hypopygium as in Fig. 18. Anal point length 48 µm. Gonostylus length 116 µm.

Material. 1 adult male, Russian Far East, Jewish Autonomous Region, Obluchie District, Lopatinskyi Spring of Bidzhan River basin (Amur River basin), N 48°37' 810'' , E 131°39'114'', 7. IV. 2014, leg. E. Makarchenko. Distribution. Holarctic species.