Key to Australian Polyrhachis (Hirtomyrma) species

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The following key to Polyrhachis (Hirtomyrma) species is based on Kohout (2010[1]).

1

  • Base of first gastral tergite finely shagreened, rather polished; mandibles with 4 teeth => 2
  • Base of first gastral tergite closely, transversely striate, opaque; mandibles with 5 teeth, but with basal tooth often vestigal => Polyrhachis bamaga

2

  • Larger species (head length > 1.85mm); median ocellus well developed, distinct => 3
  • Smaller species (head length < 1.80mm); median ocellus rather small, indistinct => Polyrhachis rustica

3

  • Body bicoloured, medium reddish-brown with most of head, pronotal collar and anteromedian patch on mesosomal dorsum light yellowish-brown; antennal scapes shorter (scape index < 144) => Polyrhachis eremita
  • Body more-or-less unicoloured, dark reddish-brown, with only mandibles, spines and subpetiolar process lighter; antennal scapes longer (scape index > 146) => Polyrhachis loweryi

References

  1. Kohout, R.J. 2010. A review of the Australian Polyrhachis ants of the subgenera Myrmhopla Forel and Hirtomyrma subgen. Nov. (Hymenoptera: Formicidae: Formicinae). Memoirs of the Queensland Museum — Nature 55(1), 167-204.