| Rank | Scientific name | Taxonomic status |
|---|---|---|
| family | Amphioxididae | accepted |
| family | Branchiostomatidae | accepted |
| family | Epigonichthyidae | accepted |
Leptocardii. GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via biodiversity.aq on 2019-11-15.