Spiny-eel - Notacanthus chemnitzii, or the Snub-nosed spiny eel, is a member of the family Notacanthidae, the deep-sea spiny eels, which are not true eels .
Spiny-back eel - The spiny-back eel, Notacanthus sexspinis, is a deep-sea spiny eel of the genus Notacanthus, found in all the southern hemisphere oceans, in depths between 500 and 1,000 m.