Fig. 21 in A phylogenetic analyis of ant morphology (Hymenoptera: Formicidae) with special reference to the poneromoprh subfamilies

Fig. 21. Mesosoma showing different degrees of thoracic fusion, left lateral view. A. Nothomyrmecia macrops. B. Myrmica americana. C. Proceratium croceum. Note that the boundaries of notal and tergal plates in B–C can be inferred only relative to the position of the spiracles. Abbreviations: a, posterolateral margins of pronotum; Eps2, mesepisternum; N1, pronotum; N2, mesonotum; N3, metanotum; Pl2, mesopleuron; Pl3, metapleuron; Pl3G, metapleural gland opening; Sp2, mesothoracic spiracle; Sp3, metathoracic spiracle; ISp, propodeal spiracle; spl, spiracle lobe; IT, propodeum.