An ampithoid species, previously known as A.tarasovi in Korea, is assigned as a new species, A.changbaensissp. nov. based on the reexamination of the holotype of A.tarasovi. The new species shows different morphological characteristics compared to A.tarasovi, especially in male gnathopods 1 and 2. The type material of A.tarasovi is redescribed and illustrated here and a key to the Korean species of Ampithoe is provided.