Some species of Xerocrassa are instead considered to belong to the subgenusXerocrassa, within the genus Trochoidea; in those cases the species are listed under the generic nameTrochoidea. However, for other authors both taxa are not closely related being different genera.[4][5][6]
^Monterosato T. A. di (1892). "Molluschi terrestri delle isole adiacenti alla Sicilia". Atti della Reale Accademia di Scienze, Lettere e Belle Arti di Palermo (3)2: 1–33. page 23.
^ abRazkin, Oihana; Gómez-Moliner, Benjamín Juán; Prieto, Carlos Enrique; Martínez-Ortí, Alberto; Arrébola, José Ramón; Muñoz, Benito; Chueca, Luis Javier; Madeira, María José (February 2015). "Molecular phylogeny of the western Palaearctic Helicoidea (Gastropoda, Stylommatophora)". Molecular Phylogenetics and Evolution. 83: 99–117. Bibcode:2015MolPE..83...99R. doi:10.1016/j.ympev.2014.11.014. PMID25485783.
^Chueca, Luis J.; Gómez-Moliner, Benjamín J.; Madeira, María José; Pfenninger, Markus (January 2018). "Molecular phylogeny of Candidula (Geomitridae) land snails inferred from mitochondrial and nuclear markers reveals the polyphyly of the genus". Molecular Phylogenetics and Evolution. 118: 357–368. Bibcode:2018MolPE.118..357C. doi:10.1016/j.ympev.2017.10.022. PMID29107619.
^Bank, R.A. (2017). "Fauna Europaea Project‒Checklist of the land and freshwater Gastropoda of Europe". {{cite journal}}: Cite journal requires |journal= (help)