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