|Muddy arrowtooth eel, Ilyophis brunneus.
From plate 43 of Oceanic Ichthyology by George Brown Goode and Tarleton Hoffman Bean, published 1896.
J. Y. Johnson, 1862
Cutthroat eels are a family, Synaphobranchidae, of eels, the only member of the suborder Synaphobranchoidei. They are found worldwide in temperate and tropical seas.
Cutthroat eels range from 23 to 160 cm (9.1 to 63.0 in) in length. They are bottom-dwelling fish, found in deep waters down to about 3,700 m (12,100 ft). They are distinguished by the presence of telescopic eyes in the larvae.