[1] The blind swamp eel was first described by the American ichthyologist Carl Leavitt Hubbs in 1938, the holotype having been collected two years earlier by A.S.Pearse.

[3] The blind swamp eel is an elongated, wormlike fish with no pigment, no scales and no visible eyes.

[4] The blind swamp eel is endemic to the Yucatán Peninsula in Mexico where it inhabits freshwater in sinkholes and limestone caves.

[2] The chief threats faced by this swamp eel is from pollution from untreated sewage and waste water which may seep into the aquifer, and from human disturbance.

[1] This is on the basis that the area occupied by this species is limited in extent, and the number of individuals is thought to have declined drastically over the last ten years, and is likely to continue doing so, due to a decrease in the quantity and quality of suitable habitat.