| Scientific Name | TSN | Taxon Author | Common Name | Name Source | Usage | Reason (ITIS) | Taxon Rank |
|---|
| Cephalochordata | 999017548 | | | | public | mtsn | Subphylum |
| Cephalochordata | 159679 | | amphioxus (common) lancelets amphioxus anfioxo cefalocordado amphioxus lancelets | ITIS | valid | | Class |
| Hemichordata | 999017469 | | | | public | mtsn | Subphylum |
| Tunicata | 203347 | Lamarck, 1816 | sea squirts tunicates ascidies tuniciers | ITIS | valid | | Subphylum |
| Urochordata | 999017482 | | | | public | mtsn | Subphylum |
| Vertebrata | 331030 | | vertebrado vertébrés vertebrates | ITIS | valid | | Subphylum |
