The best morphometric ratio (petiole length / petiole height; PEL/PH) is illustrated on the head length (CL). Scatterplots of the most discriminating ratio on the head length between workers of Western Palaearctic representatives of Ponera; P. coarctata: black circles, P. testacea: red triangles. The thin dashed line illustrates best separation.

 
 
  Part of: Csősz S, Kiran K, Karaman C, Lapeva-Gjonova A (2022) A striking color variation is detected in Ponera testacea Emery, 1895 (Hymenoptera, Formicidae) across its Western Palaearctic geographic range. ZooKeys 1084: 151-164. https://doi.org/10.3897/zookeys.1084.79415