Large serpentine predators that live in the caves of the primitive planet Hanon IV, where one kills members of the stranded Voyager crew in Basics.
The Hanonian land eel is a large, snake-like carnivore native to Hanon IV, seen in the second part of the Voyager story Basics. It lives in cave systems and drags its prey underground.
After the Kazon under Seska and Culluh capture Voyager, they maroon the crew on this harsh, volcanic planet without equipment. While gathering supplies near a cave mouth, the engineer Hogan is seized and killed by one of the creatures. The crew later take refuge in the same caves and lose another of their number before escaping.
Hogan's remains have a longer history. In the episode Distant Origin a Voth scientist finds his bones on the planet and, noticing how closely human genetics resemble his own, sets out to track down Voyager.