Ophichthus tetratrema

Ophichthus tetratrema is an eel in the family Ophichthidae (worm/snake eels). It was described by John E. McCosker and Richard Heinrich Rosenblatt in 1998. It is a marine, deep water-dwelling eel which is known from the eastern Pacific Ocean, including Costa Rica and Ecuador. It dwells at a depth range of 700 to 1000 m. Females can reach a total length of 55.6 cm.

The species epithet "tetratrema" means "four holed" in Greek, and is treated as a noun in apposition. It refers to the four preopercular pores on the eel.