larva, [515];

relations with other Dipnoi, [518], [519];

P. aethiopicus, [512];

P. annectens, [509], [512];

P. dolloi, [512]

Protosphyraena, [502]

Protospondyli, [497]

Protostigmata, [59]

Protosyngnathidae, [631], [628]

Protosyngnathus sumatrensis, [632]