''Formica fossaceps'' is a species of ant in the genus '' Formica'' (wood ants, mound ants, and field ants), in the family Formicidae.Sharkey M.J. (2007). ''Hylogeny and Classification of Hymenoptera''."Phylogenetic relationships among superfamilies of Hymenoptera", Sharkey M.J., Carpenter J.M., Vilhelmsen L., et al. 2012. ''Cladistics'' 28(1): 80-112. This species is a member of the ''Formica rufa'' species group.

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