Dodatak:Popis mahovnjaka, R
Ra uredi
- Ragionula
- Ralepria
- Ramipora
- Ramphonotus
- Raxifabia
- Raymondcia
Re uredi
†Realeksella Goryunova 1993 uredi
- Realeksella optata Gorjunova, 1993
Animalia → Bryozoa → Stenolaemata → Cystoporata
- Reciprocus
- Rectonychocella
- Reginella
- Reginelloides
- Reptadeonella
- Reptotubigera
- Retelepralia
- Reteporella
- Reteporellina
- Retevirgula
- Retiflustra
- Reussia
- Reussina
- Reussinella
- Reussirella
Rh uredi
- Rhabdozoidae
- Rhabdozoum
- Rhamphosmittina
- Rhamphostomella
- Rhinoporidae
- Rhynchozoon
Ri uredi
- Richbunea
- Riscodopa
Ro uredi
- Robertsonidra
- Robertsonidridae
- Rodinopora
- Rogicka
- Romancheina
- Romancheinidae
- Rosseliana
- Rosulapelta
Ru uredi
†Ruzhencevia Kiseleva, 1982 uredi
- †Ruzhencevia incrustata Morozova 1970
- †Ruzhencevia nevolinae Kiseleva 1982