Campbell, D.C. 2000. Molecular evidence on the evolution of the Bivalvia. [in] The Evolutionary Biology of the Bivalvia (Harper et al., eds.). Geological Society, London Special Publications: 31-46. Available electronically.
(click the figure number to see the cladogram)
+----- Margaritifera_margaritifera
--+
| +-- Utterbackia_imbecillis
+--+
+-- Elliptio_complanata