Brachymyrmex longicornis Forel, 1907 junior synonym of current valid taxon Brachymyrmex australis Forel, 1901
Brachymyrmex longicornis Forel, 1907h: 9 (w.) BRAZIL (Rio Grande do Sul). Neotropic.
Primary type information: Primary type material: syntype workers (number not stated). Primary type locality: Brazil: Rio Grande do Sul, Porto Alegre (on orchids, intercepted in plant quarantine at Hamburg, Germany). Primary type depository: MHNG. Type notes: Ortiz-Sepúlveda et al., 2019: 468, cite 2 worker syntypes.
Citations

Extant: 0 valid subspecies (2 synonyms, 1 obsolete combination)