| Family | Scientific Name | Author | Year | Common Name |
| Ophichthidae | Pseudomyrophis nimius | Böhlke | 1960 | Elongate Worm Eel |
Pseudomyrophis nimius
Unique Characters: Tail tip flexible, caudal-fin rays not conspicuous, confluent with dorsal and anal fins. Gill opening midlateral, an opening constricted. Posterior nostril before eye, above upper lip and not covered by a flap. Pectoral fins present, but may be reduced to small, barely noticeable flaps in posterodorsal corner of gill opening. Body extremely elongate, its depth 1-1.5% of total length; head 5.2-6.1% of total length. Dorsal-fin origin behind midtrunk.
Similar Species: Diminutive Worm Eel Pseudomyrophis fugesae. Tail tip flexible, caudal-fin rays not conspicuous, confluent with dorsal and anal fins. Gill opening midlateral, an opening constricted. Posterior nostril before eye, above upper lip and not covered by a flap. Pectoral fins present, but may be reduced to small, barely noticeable flaps in posterodorsal corner of gill opening. Body elongate, its depth at or greater than 1.5% total length; head length greater than 6.9% total length. Dorsal-fin origin about at midtrunk.
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