Marrone, F., G. Nardi, S. Cianfanelli, M. Govedič, S.A. Barra et al. 2019. Diversity and taxonomy of the genus Unio Philipsson in Italy, with the designation of a neotype for Unio elongatulus C. Pfeiffer (Mollusca, Bivalvia, Unionidae). Zootaxa 4545(3): 339-374. https://doi.org/10.11646/zootaxa.4545.3.2.
(click the figure number to see the cladogram)