 A number of good complete and partial skeletons, some with feather impressions, are known of the type species, "Limnofregata azygosternon", and "L. hasegawai" is known from two skulls and most of one torso.Birds of the genus "Limnofregata" resembled modern frigatebirds, but had shorter less-hooked bills and longer legs, and longer slitlike nasal openings.They stood tall when on the ground and had a wingspan of about .