Table 1.

Information on sampling sites. Only M. pygmeaus which was used for genetic analysis as an outgroup was collected in the Yakovleva inlet.

Collection sites	Water area	Year	Coordinates
Korga-Islet in the Levina inlet, vicinities of Sredniy Island	Kandakaksha Bay, White Sea	2018	66°18′04.09″N 33°27′27.02″E
Yakovleva inlet, vicinities of Sredniy Island	Kandakaksha Bay, White Sea	2018	66°18′50.01″N 33°50′20.06″E
Vicinities of Dalnie Zeletsy	Barents Sea	2017	69°06′56″N 36°04′10″E
Vicinities of Kiberg	Varanger Fjord, Barents Sea	2017	70°17′07″N 30°59′53″E
Vicinities of Tromsø	Norwegian Sea	2018	69°40′58″N 18°56′34″E