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Lepidosiren, lep-i-do-sī′ren, n. one of the Amazon mud-fishes or Dipnoi.

These plates serve to ally them with the Ganoids, as their jaws do with Lepidosiren.

This fish resembles the Lepidosiren in many essential points of structure; but its fins have lateral rays, and are consequently of some breadth, though of peculiar form, and its mouth is armed with flat, pavement-like teeth, wherewith it browses on aquatic grasses.

Whilst Amphioxus at the lower end of the class of fishes connects these with the soft-bodied animals, or Mollusca, at the upper end of the Pisces, we have the Lepidosiren, or mud-fish.

Dip�noi, mud-fishes or lung-fishes, an ancient order now represented by three genera—Neoceratodus, Protopterus, and Lepidosiren.