Mock, K.E., J.C. Brim Box, J.P. Chong, J. Furnish & J.K. Howard. 2013. Comparison of population genetic patterns in two widespread freshwater mussels with contrasting life histories in western North America. Molecular Ecology 22: 6060-6073. Available electronically.
(click the figure number to see the cladogram)
+----- Margaritifera_margaritifera
--+
| +-- Margaritifera_falcata
+--+
+-- Margaritifera_laevis