Gustafson, R.G. & E.M. Iwamoto. 2005. A DNA-based identification key to Pacific Northwest freshwater mussel glochidia: importance to salmonid and mussel conservation. Northwest Science 79(4): 233-245.
(click the figure number to see the cladogram)
+----------- Margaritifera_falcata
--+
| +-------- Gonidea_angulata
+--+
| +----- Beringiana_beringiana
+--+
| +-- Anodonta_oregonensis
+--+
+-- Anodonta_nuttalliana