| Species | Name Used |
|---|---|
| Didemnum candidum Savigny, 1816 | Didemnum candidum (p. 627 ) |
| Didemnum chilense Ärrnbäck, 1929 | Didemnum chilense (p. 627 ) |
| Didemnum densum (Nott, 1892) | Polysyncraton densum (p. 627 ) |
| Didemnum lambitum Michaelsen, 1924 | Didemnum lambitum (p. 627 ) |
| Didemnum lithostrotum Brewin, 1956 | Polysyncraton lithostrotum (p. 627 ) |
| Didemnum maculatum (Nott, 1892) | Didemnum maculatum (p. 627 ) |
| Didemnum niveum (Nott, 1892) | Didemnum niveum (p. 627 ) |
| Didemnum studeri Hartmeyer, 1911 | Didemnum studeri (p. 627 ) |
| Didemnum tuberatum (Nott, 1892) | Didemnum tuberatum (p. 627 ) |
| Didemnum vexillum Romanov, 1989 | Didemnum vexillum (p. 625 ) |
| Polysyncraton mortenseni (Michaelsen, 1924) | Polysyncraton mortensi (p. 627 ) |