The Japanese sea lion (Zalophus japonicus) (Japanese: ニホンアシカ, romanized: Nihon ashika, Korean:강치, 바다사자) was an aquatic mammal that became extinct in the 1970s. ... Japanese sea lion Extinct (1970s) (IUCN 3.1) Scientific classification Kingdom:Animalia Phylum:Chordata 13 more rows