| Synonym | Author | CoL Status | Valid | Synonymy | Combination |
|---|---|---|---|---|---|
| Phascolosoma agassizii | Keferstein, 1866 | accepted name | Yes | senior synonym |
original combination |
| Phascolosoma agassizii agassizii | Keferstein, 1866 | accepted name | No | senior synonym |
original combination |
| Phascolosoma agassizii kurilense | (Satô, 1937) | accepted name | No | senior synonym |
change in rank |
| Phascolosoma formosense | (Satô, 1939) | synonym | No | junior synonym |
new combination |
| Phascolosoma glaucum | (Satô, 1930) | synonym | No | junior synonym |
new combination |
| Phascolosoma golikova | Murina, 1975 | synonym | No | junior synonym |
original combination |
| Phascolosoma japonicum | Grübe, 1877 | synonym | No | junior synonym |
original combination |
| Phascolosoma kurilense | (Satô, 1937) | synonym | No | senior synonym |
new combination |
| Phascolosoma lordi | Baird, 1868 | synonym | No | junior synonym |
original combination |
| Phascolosoma yezoense | (Ikeda, 1924) | synonym | No | junior synonym |
new combination |
| Phymosoma agassizii | (Keferstein, 1866) | synonym | No | senior synonym |
new combination |
| Phymosoma japonicum | (Grübe, 1877) | synonym | No | junior synonym |
new combination |
| Physcosoma formosense | Satô, 1939 | synonym | No | junior synonym |
original combination |
| Physcosoma glaucum | Satô, 1930 | synonym | No | junior synonym |
original combination |
| Physcosoma japonicum | (Grübe, 1877) | synonym | No | junior synonym |
new combination |
| Physcosoma kurilense | Satô, 1937 | synonym | No | senior synonym |
original combination |
| Physcosoma yezoense | Ikeda, 1924 | synonym | No | junior synonym |
original combination |