Ventral view of specimen with three teeth, showing oval internal opening at the bottom of the apertural tube (white arrow) and dark coloured organic frame at the base of the tube (black arrow)  
  Part of: Todorov M (2015) On the morphology, biometry and biogeography of Lamtopyxis callistoma (Amoebozoa: Arcellinida). Biodiversity Data Journal 3: e4297. https://doi.org/10.3897/BDJ.3.e4297