Krebs, R.A., L.E. Burlakova & D.T. Zanatta. 2019. Post-glacial dispersal patterns of Pyganodon grandis (Bivalvia: Unionidae) in the lower Great Lakes watershed. Nautilus 133(3-4): 74-84. Available electronically.
(click the figure number to see the cladogram)
+----- Pyganodon_grandis
--+
| +-- Pyganodon_fragilis
+--+
+-- Pyganodon_cataracta