Fossil bee cells from the early Eocene Asencio Formation of Uruguay 21 external aspect of Palmiraichnus castellanosi, scale: 1 cm 22 longitudinal section of P. castellanosi showing the chamber and the filled antechamber, scale: 1 cm.

  Part of: Sarzetti L, Genise J, Sanchez M (2014) Nest architecture of Oxaea austera (Andrenidae, Oxaeinae) and its significance for the interpretation of Uruguayan fossil bee cells. Journal of Hymenoptera Research 39: 59-70.