Key to Gauromyrmex workers

Key to workers of Gauromyrmex based on Chen & Chen (2022).

1

 * In dorsal view, humeral corners of pronotum with a pair of distinct denticles (Figs. 2, 5, 8) Gauromyrmex acanthinus
 * In dorsal view, humeral corners of pronotum rounded (Figs. 12, 16)

2

 * In full face view, anteromedian part of clypeus prominent, with anterior margin arc depression, forming rounded lobes laterally; posterior corners of propodeum rounded; subpetiolar process absent; in full face view, head smooth and shiny; in dorsal view, pronotum with longitudinal striation and puncta; mesonotum, propodeum, petiole and postpetiole reticulate-puncture (Figs. 11–13) Gauromyrmex bengkalisi
 * In full face view, anteromedian part of clypeus unremarkable, with anterior margin weakly depression, but no forming rounded lobes laterally; posterior corners of propodeum with marked spines or teeth; subpetiolar process triangular transparently; in full face view, head longitudinally striate; in full face view, promesonotal dorsum weakly and longitudinally striate (Figs. 14–16) Gauromyrmex orbihumerus