Geographic distribution of the lamprey genus Lethenteron in Eurasia based strictly on the examination of type material of Petromyzon marinus camtschaticus (●), Petromyzon kessleri (■), Lampetra japonica septentrionalis (▲) and ZIN material identified by Berg (1931) as Lampetra japonica japonica (○), La. j. kessleri (□), and La. j. septentrionalis (∆). Note that the easternmost record of La. j. kessleri from the Anadyr Estuary has been re-identified as Le. camtschaticum.