| Nominal Species (n = 25) | Present allocation (n = 24) | Ref. |
|---|---|---|
| Ptychodera australiensis Hill, 1895 | Balanoglossus australiensis | 1456 |
| Ptychodera bahamensis Spengel, 1893 | Ptychodera bahamensis | 19 |
| Balanoglossus biminiensis Willey, 1899 | Balanoglossus gigas | 3477 |
| Balanoglossus carnosus Müller, 1893 | Balanoglossus carnosus | 19 |
| Ptychodera ceylonica unspecified | Ptychodera ceylonica | 19 |
| Balanoglossus clavigerus delle Chiaje, 1829 | Balanoglossus clavigerus | 19 |
| Glossobalanus crozieri van der Horst, 1924 | Glossobalanus crozieri | 19 |
| Glossobalanus elongatus Spengel, 1904 | Glossobalanus elongatus | 19 |
| Ptychodera erythrea Spengel | Ptychodera erythrea | 19 |
| Ptychodera flava Eschscholtz, 1825 | Ptychodera flava | 19 |
| Balanoglossus gigas Müller, 1893 | Balanoglossus gigas | 19 |
| Ptychodera hedleyi Hill, 1897 | Glossobalanus hedleyi | 1456 |
| Balanoglossus hydrocephalus Kuwano, 1902 | Balanoglossus hydrocephalus | 19 |
| Glossobalanus indicus Rao, 1955 | Glossobalanus indicus | 19 |
| Balanoglossus jamaicensis Willey, 1899 | Balanoglossus jamaicensis | 3477 |
| Glossobalanus marginatus Meek, 1922 | Glossobalanus marginatus | 19 |
| Glossobalanus minutus Kowalevsky, 1866 | Glossobalanus minutus | 19 |
| Balanoglossus misakiensis Kuwano, 1902 | Balanoglossus misakiensis | 19 |
| Glossobalanus mortenseni van der Horst, 1932 | Glossobalanus mortenseni | 19 |
| Balanoglossus occidentalis Ritter, 1902 | Balanoglossus occidentalis | 19 |
| Ptychodera pelsarti Dakin, 1916 | Ptychodera pelsarti | 19 |
| Balanoglossus proterogonius Belichov, 1928 | Balanoglossus proterogonius | 19 |
| Balanoglossus salmoneus Belichov, 1928 | Balanoglossus salmoneus | 19 |
| Balanoglossus stephensoni van der Horst, 1937 | Balanoglossus stephensoni | 19 |
| Balanoglossus studiosorum van der Horst | Balanoglossus studiosorum | 19 |