Forelius pusillus is a species of ant in the genus Forelius. Described by Santschi in 1922, the species is endemic to South America.Cuezzo, F. 2000. Revisión del género Forelius (Hymenoptera: Formicidae: Dolichoderinae). Sociobiology 35: 197-275 (page 263, Raised to species and senior synonym of tucumanus)
Behaviour Forelius pusillus is noted to perform "pre-emptive defensive self-sacrifice", where a group of ants leave the security of the nest after sealing the entrance from the outside each evening.
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