45 Species in Family Diazonidae
| Scientific Name | Author | English Name |
|---|---|---|
| Atriolum bucinum | Kott, 2001 | |
| Atriolum eversum | Kott, 2001 | |
| Atriolum glauerti | (Michaelsen, 1930) | |
| Atriolum lilium | Kott, 2001 | |
| Atriolum marinense | Kott, 2001 | Orange tubular ascidian |
| Atriolum marsupialis | Monniot, 1989 | |
| Atriolum robustum | Kott, 1983 | Robust sea squirt |
| Atriolum tubiporum | Kott, 2001 | |
| Diazona labyrinthea | Monniot & Monniot, 1996 | |
| Diazona pedunculata | Monniot, & Monniot, 2001 | |
| Diazona tenera | Monniot & Monniot, 1996 | |
| Diazona textura | Monniot, 1987 | |
| Diazona violacea | Savigny, 1816 | Football sea squirt |
| Diazona angulata | Monniot & Monniot, 1996 | |
| Diazona carnosa | Monniot & Monniot, 1996 | |
| Diazona chinensis | (Tokioka, 1955) | |
| Diazona formosa | Monniot & Monniot, 1996 | |
| Diazona fungia | Monniot, & Monniot, 2001 | |
| Diazona geayi | Caullery, 1914 | |
| Diazona gigantea | (Sluiter, 1919) | |
| Pseudodiazona abyssa | Monniot & Monniot, 1974 | |
| Pseudodiazona claviformis | (Kott, 1963) | |
| Rhopalaea abdominalis | (Sluiter, 1898) | Reef tunicate |
| Rhopalaea birkelandi | Tokioka, 1971 | |
| Rhopalaea circula | Monniot, & Monniot, 2001 | |
| Rhopalaea cloneyi | Vazquez & Young, 1996 | |
| Rhopalaea crassa | (Herdman, 1880) | Blue yellow ringed sea squirt |
| Rhopalaea defecta | (Sluiter, 1904) | |
| Rhopalaea desme | Monniot & Monniot, 2003 | |
| Rhopalaea flemingi | (Herdman, 1880) | |
| Rhopalaea fusca | (Herdman, 1880) | |
| Rhopalaea hartmeyeri | Salfi, 1927 | |
| Rhopalaea idoneta | Shenkar, 2013 | |
| Rhopalaea macrothorax | Tokioka, 1953 | |
| Rhopalaea meridionalis | Kott, 2006 | |
| Rhopalaea neapolitana | Philippia, 1843 | |
| Rhopalaea orientalis | Pérès, 1958 | |
| Rhopalaea perlucida | Monniot, 1997 | |
| Rhopalaea piru | Monniot & Monniot, 1987 | |
| Rhopalaea respiciens | Monniot, 1991 | |
| Rhopalaea sagamiana | Oka, 1927 | |
| Rhopalaea tenuis | (Sluiter, 1904) | |
| Tylobranchion antarcticum | Herdman, 1902 | |
| Tylobranchion nordgaardi | (Hartmeyer, 1922) | |
| Tylobranchion speciosum | Herdman, 1886 |