Placodermi
  盾皮綱; 盾皮魚綱
  Plac·o·der·mi n. pl.  Paleon. An extinct group of fishes, supposed to be ganoids. The body and head were covered with large bony plates. See Illust. under Pterichthys, and Coccosteus.
  ◄ ►
  Placodermi
       n : extinct group of bony-plated fishes with primitive jaws
           [syn: class Placodermi]