Key to Australian Ectomomyrmex Species

The following key to Australian Ectomomyrmex workers is based on the unpublished work of Steve Shattuck.

• Body larger, head width > 1.6mm; posterior margin of head concave; scapes similar in colour to head; anterior clypeal margin concave medailly => Ectomomyrmex astutus

• Body smaller, head width < 1.3mm; posterior margin of head flat or nearly so; scapes distinctly lighter in colour than head; anterior clypeal margin with a medial tooth => Ectomomyrmex ruficornis