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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