Key to Australian Polyrhachis (Myrmatopa) species

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

1

 * Lateral margins of mesonotum produced into distinct dorsolateral prominences (extralimital) => (P. schang-group)
 * Lateral margins of mesonotum rather flat, without distinct dorsolateral prominences => 2

2

 * Pronotal humeri produced into distinctly upturned, acute teeth; head and body black with gaster and appendages medium to dark reddish-brown (P. flavicornis group) => 3
 * Pronotal humeri obtusely angulate; body and appendages more-or-less uniformly medium reddish-brown, with head usually a shade darker (P. wallacei group) => Polyrhachis yarrabahensis

3

 * Larger (HL >2.00); antennal scapes relatively short (SI<140); propodeal spines rather long, strongly upturned => Polyrhachis menozzii
 * Smaller (HL <1.70); antennal scapes relatively long (SI >160); propodeal spines reduced to short acute teeth => Polyrhachis alphea