aspidorhynchidæ

from The Century Dictionary.

• In Günther's system of classification, a family of lepidosteoid fishes with an elongated body covered with ganoid scales, a series of enlarged scales along the sides, jaws prolonged into a beak, the vertebral column homocercal, the fins furnished with fulcra, and the dorsal fin opposite the anal. The species are extinct; they lived during the Mesozoic epoch.