♂ genitalia of Myrmica ruginodis (PMJ:Hex:2205), 3D reconstructions (A–D) and summary diagrams (E–H). Orthogonal caps at end of diagrammatic muscle lines signify origin; lack of caps, insertion. A dorsal view. B ventral view. C profile view. D sagittal cross-section. E ventral longitudinal muscles, profile view IX. F intrinsic dorsoventral muscles IX and sterno-coxal muscles IX, profile view. G tergo-coxal muscles IX, profile view. H coxo-penial muscles, sagittal cross-section. I coxo-stylar and coxo-lateropenital muscles, profile view. Abbreviations: ASVIII = abdominal sternite VIII; ASIX = abdominal sternite IX; ATIX = abdominal tergite IX; cer = cercus; cup = cupula; end = endophallic sclerite; gct = gonocoxital arm; gcx = gonocoxite; psc = penial sclerite; stl = gonostylus; vol = volsella; 8vpmm = ventral paramedial muscles VIII–IX; 8volm = ventral ortholateral muscles VIII–IX; 9dvim = dorsoventral intrinsic muscles IX; 9vcm1 = anteromedial sterno-coxal muscles; 9vcm2 = posteromedial sterno-coxal muscles; 9vcm3 = lateral sterno-coxal muscles; 9dcm1 = dorsal tergo-coxal muscles; 9dcm2 = dorsolateral tergo-coxal muscles; 9dcm3 = ventrolateral tergo-coxal muscles; 9dcm4 = ventral tergo-coxal muscles; 9csm2 = intermediate coxo-stylar muscles; 9clm2 = lateral intrinsic coxo-lateropenital muscles; 9clm3 = medial extrinsic coxo-lateropenital muscles; 9cppd = dorsal coxo-penial promotors; 9cprd1 = medial dorsal coxo-penial remotors; 9cprd2 = lateral dorsal coxo-penial remotors; 9cppv1 = anterior ventral coxo-penial promotors; 9cppv2 = posterior ventral coxo-penial promotors; 9cprv2 = lateral ventral coxo-penial remotors.