Protomognathus americanus is a species of ant that is 2-3 mm in size and the sole member of the genus Protomognathus. It is endemic to the northeastern United States and adjacent Canadian regions.  P. americanus is a species of slave-maker ant. They do not forage for food, but instead 'scout workers' from the colony seek out nearby host colonies of ants, steal larvae and bring them back to their own colony. A small P. americanus colony could consist of a queen, two to five workers and thirty to sixty slaves.
- Social Insects Specialist Group 1996. Protomognathus americanus. 2006 IUCN Red List of Threatened Species. Downloaded on 10 August 2007.
- BBC, Slave-making ants target the strong not the weak 2010
- Animal Behaviour. Slave-making ants prefer larger, better defended host colonies.
- Media related to Protomognathus americanus at Wikimedia Commons
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