Fig. 28 in A taxonomic revision of the Palaearctic members of the Formica rufa group (Hymenoptera: Formicidae) - the famous mound-building red wood ants

Fig. 28: Classification by three variants of NC-clustering of 225 nest samples of workers of Formica lugubris (black bars) and 76 nest samples of Formica pratensis (grey bars). The mean error of three analyses is 0.2%. Ten phenotypic characters were considered. The small, well separated sub-branch in the F. lugubris cluster represents Fennoscandian nest samples containing exclusively Hippie morph workers.