leptolepidæ

from The Century Dictionary.

• A family of extinct amioid fishes, typified by the genus Leptolepis, with the vertebræ ossified, the tail homocercal, the scales cycloid, the fins without fulcra, the dorsal fin short, and teeth in bands mostly minute, but some developed as canines in front. The family flourished in Liassic and Oölitic epochs.