Literature
- Morton, J. E. 1964. Locomotion. In: Wilburg, K. M. and Yonge, C. M. (eds). Physiology of Mollusca I, N.Y., London (Academic Press): 383-423, 28 figs.
- Nicol, J. A. C. 1964. Special effectors: luminous organs, chromatophores, pigments, and poison glands. In: Wilburg, K. M. and Yonge, C. M. Physiology of Mollusca 1. New York, London (Academic Press): 353-381, 11 figs.
- Pafort-van Iersel, G. J. S. and Spoel, S. van der 1979. 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.
- Pelseneer, P. 1888b. Report on the Pteropoda collected by H. M. S. Challenger during the years 1873-1876, 3. Anatomy Reports on the scientific. Results of the voyage of H. M. S. Challenger during the years 1873-1876(zool.) 23(2): 1-97, 1 tab., 5 figs, 5 pls.