The Sailfin snake-eel (Letharchus rosenblatti) also known as the Black sailfin eel in Mexico,[2]) is an eel in the family Ophichthidae (worm/snake eels).

[4] It is a marine, tropical eel which is known from the eastern central and southeastern Pacific Ocean, including Colombia, Ecuador, Costa Rica, Panama and Mexico.

[5] It dwells at a depth range of 0 to 17 metres (0 to 56 ft), and inhabits sand sediments.

Males can reach a maximum total length of 31 centimetres (12 in).

[3] Due to a lack of known major threats and lack of observed population decline, the IUCN redlist currently lists the Sailfin snake-eel as Least Concern.