Cladoselachii

Cladoselachii

[‚klad·ō·sə′lāk·ē‚ī]

(paleontology)

An order of extinct elasmobranch fishes including the oldest and most primitive of sharks.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.