Mannerheimia yasudai Watanabe, 1990

Fig. 16, 27–28; Map 10.

Mannerheimia yasudai Watanabe, 1990: 86 (type locality: Japan, Hokkaido, Mt. Kurodake on Daisetsu Mts.)

MATERIAL. 1 ♀: Saratovskaya River – Tyatina River, shore near Ploskogornyi Cape, 44°15´56´´N 146°08´37´´E, 21– 24.07.2014, Yu.N. Sundukov leg. (MSPU) ; 1 ♂, 1 ♀: environs of Tretyakovo, litter, near stream, 18– 21.07.1990, S.A. Kurbatov leg. (CS) ; 1 ♀: Ozyornyi kordon, 21– 28.07.2011, S.A. Kurbatov leg. (RCPQ) .

DISTRIBUTION. Russia: southern Kurile Islands (Kunashir: Map 10). — Japan (Hokkaido).

BIONOMICS. Specimens were collected on the banks of streams and rivers with cold water, more frequently in the thermal zone (Fig. 16).

REMARKS. In the present study we provide figures of the aedeagus (Figs 27–28), including the internal sac. The species is recorded from Russia and Kunashir for the first time.