| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Clavelinidae | Sea Squirt | Clavelina coerulea | |
| Diazonidae | Sea Squirt | Diazona violacea | |
| Didemnidae | Sea Squirt | Didemnum molle | |
| Euherdmaniidae | Sea Squirt | Euherdmania claviformis | |
| Holozoidae | Sea Squirt | Sycozoa arborescens | |
| Placentelidae | Sea Squirt | Placentela crystallina | |
| Polycitoridae | Sea Squirt | Archidistoma aggregatum | |
| Polyclinidae | Sea Squirt | Aplidium californicum | |
| Protopolyclinidae | Sea Squirt | Monniotus spica | |
| Pseudodistomidae | Sea Squirt | Pseudodistoma crucigaster | |
| Ritterellidae | Sea Squirt | Ritterella pulchra | |
| Stomozoidae | Sea Squirt | Stomozoa gigantea | |
| Vitrumidae | Sea Squirt | Vitrum mjoebergi | |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Agneziidae | Sea Squirt | Agnezia glaciata |  |
| Ascidiidae | Sea Squirt | Phallusia mammillata |  |
| Cionidae | Sea Squirt | Ciona savignyi |  |
| Corellidae | Sea Squirt | Corella inflata |  |
| Dimeatidae | Sea Squirt | Dimeatus attenuatus |  |
| Hypobythiidae | Sea Squirt | Hypobythius calycodes |  |
| Octacnemidae | Sea Squirt | Megalodicopia hians |  |
| Perophoridae | Sea Squirt | Ecteinascidia turbinate |  |
| Plurellidae | Sea Squirt | Plurella kottae |  |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Molgulidae | Sea Squirt | Molgula manhattensis |  |
| Pyuridae | Sea Squirt | Microcosmus sabatieri |  |
| Styelidae | Sea Squirt | Polycarpa aurata |  |