Separating Strumigenys membranifera from other short mandibular Strumigenys A S. membranifera in profile view with pronotal margination and lack of standing hairs on mesosoma and first tergite shown (CASENT0023769, Michele Esposito) B S. membranifera in full face view showing sharp transverse edge across width of mandible anterior to the clypeal margin, and hairs on subbasal bend that are directed toward scape base (CASENT0023769, Michele Esposito) C S. baudueri in profile with hairs on mesosoma and first gasteral tergite indicated (CASENT0280694, Estella Ortega) D S. baudueri full face face lacking hairs that direct toward scape base (CASENT0280694, Estella Ortega). 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