Paedogobius

Paedogobius kimurai is a species of goby from the subfamily Gobionellinae, and the only member of the monotypic genus Paedogobius. It is native to marine and brackish waters of inner bays in Japan, Thailand and Australia. Its English language common names include wide-gape paedomorphic goby and babyface goby. Its Japanese language common name is shirasukiba-haze.

This fish is a protogynous hermaphrodite, undergoing a form of sequential hermaphroditism in which females change sex to male. It is a diandric species, one in which there are two types of male, the primary male that is born male, and the secondary male that is born female but later becomes male.