Lemer, S., R. Bieler & G. Giribet. 2019. Resolving the relationships of clams and cockles: dense transcriptome sampling drastically improves the bivalve tree of life. Proceedings of the Royal Society B 286:20182684: 1-9. Available electronically.
(click the figure number to see the cladogram)
+-- Neotrigonia_margaritacea
+-----+
| +-- Neotrigonia_lamarckii
|
--+ +-- Etheria_elliptica
| +--+
| | +-- Aspatharia_pfeifferiana
+--+
| +-- Margaritifera_margaritifera
+--+
+-- Lampsilis_cardium