Bieler, R., P.M. Mikkelsen, T.M. Collins, E.A. Glover, V.L. González et al. 2014. Investigating the Bivalve Tree of Life — An exemplar-based approach combining molecular and novel morphological characters. Invertebrate Systematics 28: 32-115. Available electronically.
(click the figure number to see the cladogram)
+----------- Neotrigonia_lamarckii
--+
| +-------- Velesunio_ambiguus
+--+
| +----- Unio_pictorum
+--+
| +-- Aspatharia_pfeifferiana
+--+
+-- Margaritifera_margaritifera
+-------- Neotrigonia_lamarckii
|
--+ +-- Aspatharia_pfeifferiana
| +--+
| | +-- Margaritifera_margaritifera
+--+
| +-- Unio_pictorum
+--+
+-- Velesunio_ambiguus