Identification keys available for Family Ophidiidae
| Key | Title |
| 945 | Key to subfamilies of cusk-eels (Ophidiidae) occurring in the Western Central Atlantic. |
| 946 | Key to species of Brotulotaeniinae occurring in the Western Central Atlantic. |
| 947 | Key to tribes of Ophidiinae occurring in the Western Central Atlantic. |
| 948 | Key to the genera of Ophidiini occurring in the Western Central Atlantic. |
| 949 | Key to the species of Otophidium occurring in the Western Central Atlantic. |
| 1348 | Key to subfamilies of Ophidiidae of the world. |
| 1349 | Key to the species of Brotulotaenia of the world. |
| 1350 | Key to tribes of Ophidiinae of the world. |
| 1351 | Key to the genera of Lepophidiinae of the world. |
| 1352 | Key to species of Lepophidium. |
| 1353 | Key to the genera of Ophidiini of the world. |
| 1354 | Key to the genera of Neobythitinae. |
| 1355 | Key to species of Apagesoma. |
| 1356 | Key to species of Barathrites. |
| 1357 | Key to species of Barathrodemus. |
| 1358 | Key to species of Bassozetus. |
| 1359 | Key to species of Dicrolene. |
| 1360 | Key to species of Enchelybrotula. |
| 1361 | Key to species of Glyptophidium. |
| 1362 | Key to species of Hoplobrotula. |
| 1363 | Key to species of Lamprogrammus. |
| 1364 | Key to species of Leucicorus. |
| 1365 | Key to species of Luciobrotula. |
| 1366 | Key to species of Mastigopterus. |
| 1367 | Key to species of Monomitopus. |
| 1368 | Key to species of Neobythites occurring in West Atlantic Ocean. |
| 1369 | Key to species of Neobythites occurring in Western Indian Ocean. |
| 1370 | Key to species of Neobythites occurring in New Caledonia. |
| 1371 | Key to species of Petrotyx. |
| 1372 | Key to species of Porogadus occurring in West Atlantic. |
| 1373 | Key to species of Sirembo. |
| 1374 | Key to species of Spottobrotula. |