^Caecum subannulatum de Folin, 1870. Gofas, S. (2009). Caecum subannulatum de Folin, 1870. In: Bouchet, P.; Gofas, S.; Rosenberg, G. World Marine Mollusca database. Accessed through the World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138955 on 9 August 2010 .