''Ogilbia galapagosensis'', the Galapagos cuskeel, is a species of fish in the family

Bythitidae The viviparous brotulas form a family, the Bythitidae, of ophidiiform fishes. They are known as viviparous brotulas as they generally viviparity, bear live young, although there are indications that some species (at least ''Didymothallus crinicep ...

. It is only known from four

brackish Brackish water, sometimes termed brack water, is water occurring in a natural environment that has more salinity than freshwater, but not as much as seawater. It may result from mixing seawater (salt water) and fresh water together, as in estuari ...

-water cave systems on

Santa Cruz Island Santa Cruz Island (Spanish: ''Isla Santa Cruz'', Chumash: ''Limuw'') is located off the southwestern coast of Ventura, California, United States. It is the largest island in California and largest of the eight islands in the Channel Islands a ...

, Galápagos, Ecuador. Although usually called a

cavefish Cavefish or cave fish is a generic term for fresh and brackish water fish adapted to life in caves and other underground habitats. Related terms are subterranean fish, troglomorphic fish, troglobitic fish, stygobitic fish, phreatic fish and hypog ...

, it has been argued that this label is inaccurate, as the places it inhabit also can be described as lagoon crevices.

References

Bythitidae Cave fish Endemic fauna of the Galápagos Islands Taxonomy articles created by Polbot Fish described in 1965 {{Bythitidae-stub