Acanthognathus rudis Brown & Kempf, 1969: 100, figs. 1, 2, 4-10 (w.q.m.) BRAZIL (São Paulo, Rio Grande do Sul, Santa Catarina, Paraná, Rio de Janeiro). Neotropic.

Primary type information: Primary type material: holotype worker. Primary type locality: Brazil: São Paulo, São Paulo, Jardim Botanico, ii.1967 (W.L. Brown). Primary type depository: MZSP. Primary type specimen: MZSP0083713. Secondary type information: Secondary type material: >61 paratype workers (total not stated), 8 paratype queens, 2 paratype males. Secondary type localities: paratype workers (number not stated), 1 paratype queen, 2 paratype males with same data as holotype; >61 paratype workers, 7 paratype queens Brazil: Rio Grande do Sul, Tainhas, iv.1959 (F. Plaumann), Brazil: Santa Catarina, Chapecó, v, viii.1969 (F. Plaumann), Ibicaré, vii.1959 (F. Plaumann), Ibicaré, ix.1960 (F. Plaumann), Nova Teutonia, vii.1952, x.1953, vi.1957, vii.1957, ii.1959, ii.1960, vi.1960, vii.1961, i.1963, and vi.1963 (F. Plaumann), Santa Catarina, Seara, vii.1958 (F. Plaumann), Paraná, Bocaiuva, v.1963 (F. Plaumann), Palmeira, v. 1963 (F. Plaumann), Volta Grande, iv.1949 (Hertel), São Paulo, Barueri, xii.1958 (K. Lenko), Guararema, xii.1957 (W.W. Kempf), São Paulo, Jardim Botanico, Agua Funda, viii.1958 (K. Lenko), Jardim Botanico, viii.1962 and ii.1967 (W.L. Brown), Serra do Cantareia (W.W. Kempf & Santos), Boraceia, Salesopolis, ii.1967 (R.H. Crozier), Rio de Janeiro, Parc Nac. do Itatiaia, xii.1955 (T. Borgmeier). Secondary type depositories: MCZC, MZSP. Secondary type specimens: MZSP0083688 to MZSP0083712, MZSP0090420 to MZSP0090425. Type notes: Ulysséa et al., 2025: Table S1, cite holotype worker, 48 paratype workers, 4 paratype queens, 1 paratype male in MZSP.