Rosenberg, G., G.S. Kuncio, G.M. Davis & M.G. Harasewych. 1994. Preliminary ribosomal RNA phylogeny of gastropod and unionoidean bivalve mollusks. Nautilus Supplement 2: 111-121. https://www.biodiversitylibrary.org/page/36924168.
(click the figure number to see the cladogram)