Petalichthyida


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Petalichthyida

[‚ped·ə·lik′thē·ə·də]
(paleontology)
A small order of extinct dorsoventrally flattened fishes belonging to the class Placodermi; the external armor is in two shields of large plates.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.