Coelacanthidae

Coelacanthidae is an extinct family of coelacanths found in freshwater and marine strata throughout the world, originating during the Permian, and finally dying out during the Jurassic.

Coelacanthus, from Ancient Greek κοῖλος (koîlos), meaning "hollow", and ἄκανθα (ákantha), meaning "spine", is a genus of extinct marine coelacanths known from the late Permian period. It was the first genus of coelacanths described, about a century before the discovery of the extant coelacanth Latimeria. The order Coelacanthiformes is named after it.