1. Primitive eel-like freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue
   "lamper eels attach themselves to fish and feed on their blood and tissues";
   - lamprey, lamprey eel

Derived forms: lamper eels

Type of: agnathan, jawless fish, jawless vertebrate

Part of: family Petromyzontidae, Petromyzontidae