Answer: ganoids

AnswerCrossword Clue
ganoidsganoid fish
ganoids(of the scale of a fish) having a smooth, shiny surface of ganoin or a similar substance
ganoidsof or pertaining to the Ganoidei, a group of mostly extinct fishes characterized by hard, bony scales, the living species of which include the paddlefishes, sturgeons, and gars
ganoidsGANOID, a type of fish