Literature
- Muus, B.J. 1959. Skallus, Søtaender, Blaeksprutter. Danmarks Fauna, Band 65. 239 pages, 117 figs. Gads Forlag, København.
- Sweeney, M.J., F.E.R. Roper, K.M. Mangold, M.R. Clarke and S. v. Boletzky (editors) 1992. "Larval" and juvenile cephalopods: a manual for their identification. Smith. Contr. Zool., 513: 1-282.
- de Kluijver, M., S. Ingalsuo and R. de Bruyne, 2000. Macrobenthos of the North Sea. Vol. I - Keys to Mollusca and Brachiopoda. World Biodiversity database, CD-ROM Series. Expert Centre for Taxonomic Identifications (ETI), University of Amsterdam, Amsterdam. .