Rh. dorsalis, [185], [227]

Rhinophrys, [167]

Rhombophryne, [225], [227]

Rhynchocephali, [292]

Rhynchosaurus, [292]

Rhytidosteus, [83]

Ribs, of Urodela, [14];

of Anura, [21];

of Microsauri, [288];

of Sphenodon, [297];