SEM image of gonostylar tooth, rotated 50 degrees and revealing clearly defined edges of sheath-like process covering megasetae. Magnification 6000× (17.4 mm working distance).  
  Part of: Deady R, Heller K, Work T, Venier L (2014) Peyerimhoffia jaschhoforum (Diptera, Sciaridae), a new deadwood inhabiting species from Canada. Biodiversity Data Journal 2: e4200. https://doi.org/10.3897/BDJ.2.e4200