| Family | Scientific Name | Author | Year | Common Name |
| Ophichthidae | Callechelys springeri | (Ginsburg) | 1951 | Ridgefin Eel |
All Callechelys Species: Tail tip a hard or fleshy finless point. Gill openings inferior, parallel or converging forward, isthmus narrower than gill opening length, unconstricted. Dorsal fin present, generally elevated, its origin on nape above supraoccipital. Pectoral fins absent; anal fin present. Median groove on underside of snout extends to and beyond anterior nostril bases. Vomerine and intermaxillary teeth present.
Callechelys springeri
Unique Characteristics: Body elongate, its depth 1.7-2.2% total length; head 5.6-7.1% total length. Jaw teeth fewer, 4 or 5 on each maxilla, 9-11 on each mandible. Dorsal spots of large individuals coalesced into dark saddles.
Similar Species:
Callechelys guineensis, Shorttail Snake Eel
Shorttail Snake Eel, Callechelys guineensis. Body elongate, its depth 1.7-2.2% total length; head 5.6-7.1% total length. Jaw teeth fewer, 4 or 5 on each maxilla, 9-11 on each mandible. Dorsal spots of large individuals not coalesced into saddles.
Callechelys muraena, Blotched Snake Eel
Blotched Snake Eel, Callechelys muraena. Body moderately elongate, its depth 2.6-3.7% total length; head 7.0-8.8% total length. Jaw teeth numerous, 7-11 on each maxilla, 11-17 on each mandible.
References:
Jordan, D.S. and B.M. Davis. 1892. A preliminary review of the Apodal fishes, or eels, inhabiting the waters of America and Europe. United States Commission of Fish And Fisheries. Part XVI. Report of the Commissioner for 1888 (July 1, 1888 to June 30, 1889). Washington, DC, Government Printing Office. pp. 581-677
McCosker, J.E. A revision of the Snake-eel genus Callechelys (Anguilliformes: Ophichthidae) with the description of two new Indo-Pacific species and a new callechelyin genus. Proceedings of the Califormia Academy of Sciences, 50(7):185-215, 14 figs., 1 pl, 4 tables.