Formica rufa, also known as the red wood ant, southern wood ant, or horse ant, is a boreal member of the Formica rufa group of ants, and is the type species for . The Formica rufa group is a subgeneric group within the genus Formica, first proposed by William Morton Wheeler. This group contains the mound-building . 01/07/2018 - This is the Formica rufa rufa of Gösswald (1941). Average worker size of this form is generally large and samples are usually conspicuously . With large mounds Formica rufa claim gigantic territories. They are famous for their aggressive behavior and happily shoots formic acid at its enemies! Formica rufa is one of four British species of 'wood ant' and is confined to England and Wales. There is some indication that there has been a contraction of the . 1996. Formica rufa. The IUCN Red List of Threatened Species 1996: e.T8645A12924924. http://dx.doi.org/10.2305/IUCN.UK.1996.RLTS.T8645A12924924.en. Current subspecies: nominal plus Formica rufa angusticeps, Formica rufa brevisetosa, Formica rufa constricta, Formica rufa obscurata, Formica rufa . Formica rufa, also known as the red wood ant, southern wood ant, or horse ant, is a boreal member of the Formica rufa group of ants, and is the type species for .