Identification keys available for Family Cynoglossidae
| Key | Title |
| 402 | Key to the species of tonguesoles (Cynoglossidae) occuring in the Western Central Pacific. |
| 728 | Key to the species of Paraplagusia from China. |
| 729 | Key to the species of Cynoglossus from China. |
| 730 | Key to the species of Symphurus from China. |
| 1104 | Key to the species of tonguefishes and tongue soles (Cynoglossidae) occurring in the Western Central Atlantic. |
| 1738 | Key to the shallow-water species of the genus Symphurus Rafinesque 1810 (Pleuronectiformes: Cynoglossidae) from the Indo-Pacific, 10 spp. as of 2021. |
| 1739 | Key to the species-group Cynoglossus ogilbyi Norman, 1926 (Pleuronectiformes: Cynoglossidae), 6 spp. as of 2021. |
| 1744 | Key to all species of the species-group Cynoglossus carpenteri Alcock 1889 (Pleuronectiformes: Cynoglossidae), 6 spp. as of 2019. |