Atta sexdens var. bisphaerica Forel, 1908: 348 (w.q.m.) BRAZIL (São Paulo). Neotropic.

Primary type information: Primary type material: syntype workers, syntype queens, syntype males (numbers not stated). Primary type locality: Brazil: São Paulo, Ypiranga, 18.xi.1906 (H. Lüderwaldt). Primary type depositories: MHNG, MZSP. Primary type specimens: CASENT0909446 MP 6287, CASENT0909445 MP 6287, MZSP0084449, MZSP0084477 (q.), MZSP0084478 (m.), MZSP0084479, MZSP0084480, MZSP0084481, MZSP0084482, MZSP0084483, MZSP0090560 (q.), MZSP0090561, MZSP0090562. Type notes: 1) Ulysséa et al., 2025: Table S2, supply the corrected collection details from the handwritten catalogues at MZSP: MP 6287, 18.xi.1906, Atta ludens L. var. bisphaerica n. var. (Formicidae), H. Lüderwaldt, Ypiranga, M, Q, W ex ninho. 2) Original collection information: Brazil: São Paulo (H. von Ihering). 2) Ulysséa et al., 2025: Table S1, cite 7 syntype minor workers, 1 syntype major worker, 2 syntype queens, 1 syntype male in MZSP.