Pseudomyrmex spinicola is a species of red myrmecophyte-inhabiting neotropical ants which are found only in Nicaragua and Costa Rica.

[citation needed] P. spinicola are the more aggressive among a number of A. collinsii-inhabiting species that engage in a classic case of mutualism.

In return, the ants actively defend the tree from herbivory and often from competing plants nearby, clearing the forest floor of other seedlings.

[3] The smallest eggs will be found in the queen's chamber, before being redistributed to other larger thorns to be nursed through early life stages.

[citation needed] The symbiotic ants living on this tree become alarmed at tissue disruption of the plant’s leaves by herbivores like the scarab, Pelidnota punctulate.