Ichthyapus ophioneus
| Family | Scientific Name | Author | Year | Common Name |
| Ophichthidae | Ichthyapus ophioneus | (Evermann & Marsh) | 1900 | Surf Eel |
Unique Characteristics: Tail tip a hard or fleshy finless point. Gill openings entirely ventral or nearly so, unconstricted. All fins absent. Coloration without large spots. Head pores developed, 3 or 4 preopercular pores present. Anterior nostril a hole, not tubular; posterior nostril opening inside mouth, with or without a flap. Eye minute (FAO 2002).
Similar Species: None
Reference: Evermann, B. W. and M. C. Marsh. 1900. The fishes of Porto Rico. Bulletin of the U. S. Fish Commission, Volume 20 (part 1): 49-350, plates 1-49.