Not necessarily expecting confirmation of this mating pair but there were literally hundreds of Archiargiolestes along the track and all males photographed were A. parvulus.
Crap photo so will add ID notes:
Lower Mudgeeraba creek. Upper body dark green, with deep blue chelae and no evidence of white. Evidence of D-L spines developing. This should differentiate it from other local Euastacus (Maidae & Sulcatus).