lepidosiren

From these primitive fishes were evolved higher fishes of the ganoid type and others of the type of Lepidosiren (Dipneusta).

Lepidosiren paradoxa was discovered by Natterer in 1837 in tributaries of the Amazon.

When the water disappears the Lepidosiren burrows down into the mud, closing its gill-openings, but breathing through the mouth.

Six pairs of branchial arches occur in Protopterus; Ceratodus and Lepidosiren have five, like most other fish.

No; but from an organ similar in character and position to the air-bladder of a ceratodus, or a lepidosiren.