Definitions

1. noun

A genus of extinct aquatic tetrapods, characterized by gills and a fish-like body, from the Early Permian period.

“Fossils of the branchiosaur have provided valuable insights into the evolution of amphibians during the Early Permian period.”

2. noun

The first tetrapod to have evolved from fish-like ancestors, characterized by gill slits.

“The branchiosaur is often cited as a prime example of the transition from aquatic to terrestrial life forms.”