porphyrioninæ

from The Century Dictionary.

• A subfamily of paludieole or ralliform wading birds of the family Rallidæ, represented by the genus Porphyrio, having the bill stout, with the base of the culmen mounting on the forehead as a frontal shield, the legs long and strong, and the toes margined; the purple gallinules, usually retained in Gallinulinæ.