| Reference no. | Description | Year | Name Used | Page |
|---|---|---|---|---|
| 56903 | Sousa, L.M. and L.H. Rapp Py-Daniel, 2005. Description of two new species of Physopyxis and redescription of P. lyra (Siluriformes: Doradidae). Neotrop. Ichthyol. 3(4):625-636. | 2005 | Physopyxis cristata | --> |
| 56787 | Eschmeyer, W.N. (ed.), 2006. Catalog of fishes. Updated database version of April 2006. Database dump. Catalog databases as made available to FishBase in April 2006. | 2006 | Physopyxis cristata | --> |