Dodatak:Popis vrpčara, O
Ob
uredi- Obnemertes
- Obnemertes Korotkevich, 1960
- Obuergeria
- Obuergeria
Oe
uredi- Oerstedia
- Oerstedia Quatrefages, 1846
- Oerstediidae
- Oerstediidae
Ol
uredi- Oligodendrorhynchus Fernández−Álvarez & Anadón, 2012
Om
uredi- Omatoplea maculosa (Montagu, 1808)
- Omatoplea rosea
Animalia → Nemertea → Nemertea incertae sedis
- Ommatoplea Ehrenberg, 1831
Op
uredi- Ophionemertes Verrill, 1874
Ot
uredi- Otoloxorrhochma
- Otonemertes
- Otonemertes
- Ototyphlonemertes
- Ototyphlonemertes Diesing, 1863
- Ototyphlonemertidae
- Ototyphlonemertidae
Ov
uredi- Ovicides Shields, 2001
Ox
uredi- Oxypolella
- Oxypolella Bergendal, 1902
- Oxypolia
- Oxypolia Punnett, 1901