Phlegethontiidae is a family of extinct aistopod tetrapodomorphs including the genera Phlegethontia and Sillerpeton.

Phlegethontiidae
Life restoration of Phlegethontia longissima
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Sarcopterygii
Clade: Tetrapodomorpha
Order: Aistopoda
Clade: Phlegethontioidea
Family: Phlegethontiidae
Cope, 1875