Identification keys available for Family Rajidae
| Key | Title |
| 49 | Key to the rays and skates (Rajidae) of Europe. |
| 115 | Key to the species of hardnose skates (Rajidae) occuring in the Western Central Pacific. |
| 700 | Key to subgenera and species of skates (Rajidae) from China. |
| 802 | Key to the species of Rajidae from Argentina and Uruguay. |
| 887 | Key to species of skates (Rajidae) occurring in the Western Central Atlantic. |
| 1526 | Key to species of Dipturus in the western North Pacific. |