| Nominal Species (n = 18) | Present allocation (n = 8) | Ref. |
|---|---|---|
| Perna acutirostris Dunker, 1869 | Isognomon nucleus | 3477 |
| Perna bicolor Adams, 1845 | Isognomon bicolor | 83435 |
| Perna dentifera Krauss, 1848 | Isognomon nucleus | 3477 |
| Parviperna francisensis Cotton & Godfrey, 1938 | Isognomon nucleus | 3477 |
| Perna incisa Conrad, 1837 | Isognomon incisum | 93550 |
| Isognomon janus Carpenter, 1857 | Isognomon janus | 19 |
| Perna lobata Reeve, 1858 | Isognomon nucleus | 3477 |
| Isognomon marsupialis Roding, 1798 | Isognomon marsupialis | 75831 |
| Perna nana Gould, 1850 | Isognomon nucleus | 3477 |
| Perna pectinata Reeve, 1858 | Isognomon nucleus | 3477 |
| Parviperna perexigua Iredale, 1939 | Isognomon nucleus | 3477 |
| Perna planorbis Dufo, 1840 | Isognomon nucleus | 3477 |
| Perna quadrangularis Reeve, 1858 | Isognomon nucleus | 3477 |
| Perna radiatus Anton, 1838 | Isognomon radiatus | 83435 |
| Perna rupella Dufo, 1840 | Isognomon nucleus | 3477 |
| Perna sulcata Lamarck, 1819 | Isognomon perna | 348 |
| Isognomon vulselloides Macsotay & Campos, 2001 | Isognomon vulselloides | 83435 |
| Isognomon vuselloides Macsotay & Villarroel, 2001 | Isognomon bicolor | 3477 |