Literature
- Minichev, Y. S. 1967. Studies on the morphology of the lower Opisthobranchia (on the evolutionary significance of the detorsion-process). Trudy Zool. Inst. Akad. Nauk S.S.S.R., Leningrad 44: 109-182.
- Morton, J. E. and Yonge, C. M. 1964. Classification and structure of the Mollusca. In: Wilburg, K. M. and Yonge, C. M. (eds). Physiology of Mollusca 1, New York, London (Academic Press): 1-58, 22 figs.
- Pelseneer, P. 1892c. La classification générale des mollusques. Bull. Sci. France Belg. 23: 1-27, 1 fig.
Also published in: Trav. Lab. Wimereux. - Spoel, S. van der 1971c. Some problems in the speciation of pteropods. Netherl. J. Zool. 21 (2): 214 [summary of lecture].