T. halidayi female nontype, head,¬†frontal view.  
  Part of: Hansson C, Schmidt S (2020) A revision of European species of the genus TetrastichusHaliday (Hymenoptera: Eulophidae) using integrative taxonomy. Biodiversity Data Journal 8: e59177. https://doi.org/10.3897/BDJ.8.e59177