Machordom, A., R. Araujo, D. Erpenbeck & M.-A. Ramos. 2003. Phylogeography and conservation genetics of endangered European Margaritiferidae (Bivalvia: Unionoida). Biological Journal of the Linnean Society 78: 235-252. https://doi.org/10.1046/j.1095-8312.2003.00158.x.
(click the figure number to see the cladogram)
+----- Potomida_littoralis
--+
| +-- Margaritifera_margaritifera
+--+
+-- Pseudunio_auricularius
+-------- Potomida_littoralis
--+
| +----- Cumberlandia_monodonta
+--+
| +-- Margaritifera_margaritifera
+--+
+-- Pseudunio_auricularius