Dodatak:Popis mahovnjaka, O
Oa
uredi- Oanduella antiqua Männil, 1958
- Oanduella bassleri Männil, 1958
- Oanduella maennili Pushkin, 1976
Bryozoa → Stenolaemata → Cryptostomida → Stictoporellina → Stictoporellidae → Stictoporellinae
- Izvori za vrste[1]
Oanduellina Pushkin, 1977†
uredi- Oanduellina baltea Lavrentjeva, 1993
- Oanduellina bella Lavrentjeva, 1993
- Oanduellina distributa Lavrentjeva, 1993
- Oanduellina leuchtenbergi Pushkin, 1977
- Oanduellina maculata Pushkin, 1977
- Oanduellina porifera (Kopajevich, 1975)
- Oanduellina reticulata Pushkin, 1977
Bryozoa → Stenolaemata → Cryptostomida → Ptilodictyina → Ptilodictyidae → Virgatellinae
Od
uredi- Odontionella
- Odontoporella
Og
uredi- †Ogiva concamerata Waters 1881 [2]
- †Ogiva ellinorvoigtae Martha et al. 2015 [2]
- †Ogiva elongata Canu and Bassler 1935 [2]
- †Ogiva incompta Gordon and Taylor 1999 [2]
- †Ogiva promonturiorum Voigt 1924 [2]
Bryozoa → Gymnolaemata → Cheilostomata → Onychocellidae
- Ogivalia elegans (d'Orbigny, 1842) [3]
- Ogivalia sagittirostra Hayward & Winston, 1994 [3]
Bryozoa → Gymnolaemata → Cheilostomatida
- Ogivalina dimorpha (Canu, 1907) [4]
- Ogivalina dimorpha meridionalis (Canu, 1919) [4]
- Ogivalina elongata Canu & Bassler, 1920 [4]
- Ogivalina elongata minor Canu & Bassler, 1920 [4]
- Ogivalina eximipora Canu & Bassler, 1917 [4]
- Ogivalina gemellaroi Cipolla, 1921 [5]
- Ogivalina gemmellaroi Cipolla, 1921 [4]
- Ogivalina mutabilis Canu & Bassler, 1918 [4]
- Ogivalina parvula (Ulrich & Bassler, 1904) [4]
- Ogivalina ramiformis Kühn, 1930 [4]
Bryozoa → Gymnolaemata → Cheilostomatida → Calloporoidea → Calloporidae
Om
uredi- Omalosecosa
On
uredi- Onchoporella
- Onchoporoides
- Oncousoecia
- Oncousoeciidae
- Onychoblestrum
- Onychocella
- Onychocellidae
Op
uredi- Opaeophora
- Oppiphorina
Or
uredi- Orbipora
- Orbiporidae
- Orbituliporidae
- Orthoporidra
- Orthoporidroides
- Orthoscuticella
Os
uredi- Osburnea
- Oshurkovia
- Osthimosia
Ot
uredi- Otionellidae
- Otionellina