Distinguishing Strumigenys argiola from other long mandibular Strumigenys species A S. argiola with arrow showing the lack of standing hairs on mesosoma and pronotal humeral hair (CASENT0280693, Estella Ortega) B S. argiola, full face view with labral lobes and orbicular hairs indicated (CASENT0280693, Estella Ortega) C S. rogeri mesosoma profile, humeral hairs and standing mesoma hairs indicated (CASENT0179508, Erin Prado) D S. rogeri full face view showing lack of orbicular hairs and visible labral lobes (CASENT0179508, Erin Prado) E S. silvestrii mesosoma profile with standing hairs on mesosoma arrowed (FMNHINS0000078527, Gracen Brilmyer) F S. silvestrii in full face view with labral lobes not visible (FMNHINS0000078527, Gracen Brilmyer). Pictures available from www.antweb.org.

 
 
  Part of: Hamer MT, Marquis AD, Guénard B (2021) Strumigenys perplexa (Smith, 1876) (Formicidae, Myrmicinae) a new exotic ant to Europe with establishment in Guernsey, Channel Islands. Journal of Hymenoptera Research 83: 101-124. https://doi.org/10.3897/jhr.83.66829