Palaeonisciformes
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Palaeonisciformes
[¦pāl·ē·ō‚nis·ə′fȯr·mēz] (paleontology)
A large extinct order of chondrostean fishes including the earliest known and most primitive ray-finned forms.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.