Curole, J.P. & T.D. Kocher. 2002. Ancient sex-specific extension of the cytochrome c oxidase II gene in bivalves and the fidelity of doubly-uniparental inheritance. Molecular Biology and Evolution 19(8): 1323-1328. Available electronically.
(click the figure number to see the cladogram)
+-------- Margaritifera_hembeli
--+
| +----- Lampsilis_teres
+--+
| +-- Quadrula_quadrula
+--+
+-- Pustulosa_pustulosa
+-- Utterbackiana_implicata
+--+
| +-- Lampsilis_teres
--+
| +-- Quadrula_quadrula
+--+
+-- Pustulosa_pustulosa
+-------- Lampsilis_teres
--+
| +----- Utterbackiana_implicata
+--+
| +-- Quadrula_quadrula
+--+
+-- Pustulosa_pustulosa