selachostomi

from The Century Dictionary.

• A superfamily of ganoid fishes, of the order Chondrostei, or an order of the class Chondrostei, containing sturgeon-like fishes which have the maxillary and interopercle obsolete and have teeth, or the family Polyodontidæ: thus distinguished from Glaniostomi. See Polyodontidæ, and cut under paddle-fish.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) A division of ganoid fishes which includes the paddlefish, in which the mouth is armed with small teeth.