Pelagic Molluscs 2.0: The structure of the columellar muscle system in Clio pyramidata and Cymbulia peroni (Thecosomata, Gastropoda), with a note on the phylogeny of both species. Bijdr. Dierk. 48 (2): 11-126.

Authors(s)	Pafort-van Iersel, G. J. S. and Spoel, S. van der
Year	1979
Title	The structure of the columellar muscle system in Clio pyramidata and Cymbulia peroni (Thecosomata, Gastropoda), with a note on the phylogeny of both species. Bijdr. Dierk. 48 (2): 11-126.