Coastal Brown Ant


  • Light brown to dark reddish brown.
  • Two node segments.
  • Uneven thorax.
  • 12-segmented antennae; three-segmented club.
  • One pair of spines on thorax.
  • Front half of head is sculptured; back is half-smooth and shiny.
  • Several species make sounds when alarmed or when food is found.
  • Ants with no obvious odour when crushed.

Workers: smaller ‘minors’ – 2 to 3 mm long, make up the vast majority of the colony; a larger ‘major’ caste – 3.5 to 4.5 mm long, which have very obvious, much larger heads, make up about 1 per cent of the population. The ‘major’ caste of worker ants are not primarily soldiers for defence. Instead, their powerful jaws are used for cutting up large pieces of food into small pieces, which can more easily be transported back to the nest by the much more numerous minors.