Välilä, S.J., K.E. Knott, E.P. Ieshko, A.E. Veselov & J.K. Taskinen. 2017. Variation in the COI gene of the freshwater pearl mussel Margaritifera margaritifera from River Vuokkijoki. Biology Bulletin 44(1): 92-98. Available electronically.
(click the figure number to see the cladogram)
+----- Potomida_littoralis
--+
| +-- Margaritifera_margaritifera
+--+
+-- Pseudunio_auricularius