J.  Thiele, ?Part 3 (Scaphopoda, Bivalvia, Cephalopoda)?, in Handbook of systematic malacology, R.  Bieler and Mikkelsen, P. M., Eds. Washington, D. C.: Smithsonian Institution Libraries, 1998, pp. 1193-1690, i-xv.

R.  Bieler and Mikkelsen, P. M., ?Bivalvia - a look at the branches?, Zoological Journal of the Linnean Society, vol. 148, pp. 223-235, 2006.