Key to Australian Polyrhachis (Myrma) species

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The following key to Australian Polyrhachis (Myrma) species (based on the worker caste) is modified from Kohout (2012[1]).

1

  • Mesosoma in profile evenly convex, without distinct ridge-like border between dorsum and propodeal declivity; head with distinct postocular carinae; antennal scapes relatively long (SL >180) (P. continua-group) => Polyrhachis inusitata
  • Mesosoma in profile with more-or-less distinct border dividing dorsum from rather abrupt declivity (e.g. Fig. 1G); head without postocular carinae; antennal scapes relatively shorter (SL <170) (P. relucens-group) => 2

2

  • Petiolar spines arising from dorsolateral angles of node, widely separated by transversely convex dorsum => Polyrhachis foreli
  • Petiolar spines arising sublaterally from dorsal edge of node, situated relatively closer together => 3

3

  • Propodeal dorsum transversely narrow, concave, with lateral margins forming vertically raised laminate flanges; antennal scapes with numerous short erect hairs => Polyrhachis rufofemorata
  • Propodeal dorsum relatively wide, virtually flat, with lateral margins distinct, but not laminate; antennal scapes without erect hairs => Polyrhachis andromache

References

  1. Kohout, R.J. 2012. A review of the Australian Polyrhachis ants of the subgenera Myrma Billberg, Myrmatopa Forel, Myrmothrinax Forel and Polyrhachis Fr. Smith (Hymenoptera: Formicidae: Formicinae). Memoirs of the Queensland Museum – Nature 56(1): 25-59.