Specimens of Dendrobaena cognettii (Michaelsen, 1903), one of the smallest European earthworms (Lumbricidae), crawling around in a Petri dish.

 
  Part of: Rota E, de Jong Y (2015) Fauna Europaea: Annelida - Terrestrial Oligochaeta (Enchytraeidae and Megadrili), Aphanoneura and Polychaeta. Biodiversity Data Journal 3: e5737. https://doi.org/10.3897/BDJ.3.e5737