From Warhammer 40k - Lexicanum
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'''Gaunts''' are the basic unit of any [[Tyranid]] swarm. They are smaller and less physically powerful than most other Tyranid organisms, but they are extraordinarily adaptable and always attack in large numbers. They are a fully mutable species, and some are grown with extra wings, adrenaline/venom sacs and even bizarre bio-weapon symbiotes, including the dreaded [[Spike Rifle]]. The most often seen species of the Gaunt are the [[
Termagaunt]] and [[Hormagaunt]]. The Termagaunt carries a ranged weapon symbiote, while the Hormagaunt is the basic assault troop.