49693 Ponticola gorlap (Iljin, 1949) Gobiidae Gobies Gobiinae Gobiiformes Teleostei Caspian bighead goby Eurasia: Caspian Sea; in Volga upriver to Astrakhan until 1977, spreaded out to Lakes Ivankovskoje and Rybinskoje (2000); invaded Don drainage (Black Sea basin) through Volga-Don canal (first record in 1972). Abundant in Lake Tsimlyansk and lower Don.