Qualitative shell-based tree depicting Nordsieck´s (2013b) Siciliaria system.

 
 
  Part of: De Mattia W, Reier S, Haring E (2021) Morphological investigation of genital organs and first insights into the phylogeny of the genus Siciliaria Vest, 1867 as a basis for a taxonomic revision (Mollusca, Gastropoda, Clausiliidae). ZooKeys 1077: 1-175. https://doi.org/10.3897/zookeys.1077.67081