sirenidae

Like other members of the Sirenidae, the northern dwarf siren is aquatic and gilled throughout its life.

Siren is a genus of aquatic salamanders of the family Sirenidae.

The third suborder, Sirenoidea, contains the four species of sirens, which are in a single family, Sirenidae.

Habrosaurus is an extinct genus of prehistoric salamander, and the oldest known member of the family Sirenidae.

They are present on non-transforming salamander species such as the mudpuppy, as well as most members of the Proteidae and Sirenidae families, which naturally never metamorphose into an air-breathing form.