Middendorffinaia mongolica
Middendorffinaia mongolica, formerly Middendorffinaia shadini, is a species of unionid mussel endemic to South Primorye, Russia. Its specific name honours Russian zoologist Vladimir Zhadin. Middendorffinaia shadini inhabits the river Razdolnaya, its tributaries Rakovka, Olenevka, Komarovka and Kiparisovka, as well as rivers Artemovka, Barabashevka and some parts of the rivers Tesnaya and Gladkaya.