| Family | Scientific Name | Author | Year | Common Name |
| Ophichthidae | Gordiichthys leibyi | McCosker and Böhlke | 1984 | String Eel |
All Gordiichthys — Tail tip a hard or fleshy finless point. Gill opening midlateral to entirely ventral, unconstructed. Dorsal fin arises behind nape. Pectoral fins absent or vestigial; median fins reduced or absent. Coloration without large spots. Gill openings low lateral, crescentic. Head pores reduced, 2 preopercular pores. Pectoral fins absent
Gordiichthys leibyi
Unique Characters: Anterior nostrils not tubular, partly set off from underside of snout by a groove. Body depth 80-91 times in total length. Lateral-line pores 161-166.
Similar Species:
Irksome Eel
Gordiichthys ergodes
Horsehair Eel
Gordiichthys irretitus
Gordiichthys ergodes. Anterior nostrils within a short tube that extends noticeably beneath underside of snout.
Horsehair Eel Gordiichthys irretitus. Anterior nostrils not tubular, partly set off from underside of snout by a groove. Body depth 100-128 times in total length. Lateral-line pores 186-189.
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