Cercyon (Cercyon) symbion Shatrovskiy, 1989

Sazhnev, A. S., 2018, New records of water beetles (Coleoptera: Helophoridae, Hydrophilidae, Hydraenidae) from Commander Islands, Far Eastern Entomologist 365, pp. 26-30 : 27-28

Cercyon (Cercyon) symbion Shatrovskiy, 1989

Figs 4–7

MATERIAL EXAMINED. Russia: Kamchatka krai, Aleutsky District, Commander

Islands, Bering Island, cove Buyan, coast of Bering Sea, under decomposing seaweed, 25–

26.VII 2012, 5♂, 9♀ (coll. A.S. Sazhnev); same locality, 21.VIII 2013, 2♂, 7♀ (coll. A.S.

Sazhnev).

NOTES. This species is recorded from Kamchatka krai for the first time. All specimens of Cercyon symbion were collected at a distance of 2–10 meters from water edge line ( Fig. 7 )

on the shore of Bering Sea under decomposing seaweed ( Laminaria , Fucus ), logs, and stones together with Creophilus maxillosus (Linnaeus, 1758) , Psammostiba sp. , Adota sp. ,

Aleochara nubis (Staphylinidae) , Lyrosoma sp. (Agyrtidae) , Hypnoidus sp. (Elateridae) , and

Diptera larvae.

DISTRIBUTION. Russian Far East (Sakhalin Oblast’, Primorsky krai, Kamchatka krai),

Japan (Ryndevich, 2001; Ôhara & Jia, 2006; Fikáček et al., 2015).

5 – penis; 6 – genital segment; 7 – habitat on Bering Island (cove Buyan coast of Bering Sea).

Family Hydraenidae Mulsant, 1844

NOTES. This family is recorded from Commander Islands for the first time.

Figures

Figs 4–7. Cercyon symbion. 4–6 –male genitalia, dorsal view: 4 – tegmen with parameres;