Thermobiotes is a monospecific genus marine ray-finned fish belonging to the family Synaphobranchidae, the cutthroat eels. Its only species is Thermobiotes mytilogeiton which is a species of deep-water eel and is so far known only from the Vai Lili hydrothermal vent area in the western central Pacific Ocean at a depth of 1,750 m (5,740 ft).

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