| Family | Scientific Name | Author | Year | Common Name |
| Ophichthidae | Quassiremus ascensionis | (Studer) | 1889 | Blackspotted Snake Eel |
Quassiremus ascensionis
Unique Characters: Quassiremus sp. (cf. ascensionis) – Potentially, an undescribed species related to the Blackspotted Snake Eel.
Similar Species: Blackspotted Snake Eel Quassiremus ascensionis. Tail tip a hard or fleshy finless point. Pectoral fins present. Gill openings unconstructed, inferior or lateral. Teeth pointed. Pectoral-fin base restricted, opposite upper half of gill openings. Pectoral fins rudimentary, much smaller than eye. Head and trunk slightly longer than tail. Dorsal-fin origin on or behind head.
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