(Synaphobranchus dolichorhynchus)
Synaphobranchus dolichorhynchus is an eel in the family Synaphobranchidae (cutthroat eels). It was described by Einar Hagbart Martin Lea in 1913, originally under the genus Leptocephalus. It is a marine, subtropical eel which is known solely from larval specimens discovered in the northern Atlantic Ocean. It is known to dwell at a depth range of 100 to 150 metres (330 to 490 ft).