Literature
- Bonnevie, K. 1913. (reprinted 1933). Pteropoda from the Michael Sars North-Atlantic Deep-Sea expedition. Rep. Sci. Res. 'Michael Sars' North Atl. Deep-Sea exp. 3(1): 1-69, 4 tabs, 58 figs, 9 pls.
- Pafort-van Iersel, G. J. S. 1985a. Contributions to pelagic zoogeography of the mid North Atlantic Ocean, 1. Distribution of pteropods, heteropods and silver hatchetfishes. In: G. J. S. Pafort-van Iersel. A contribution to pelagic zoogeography of the mid North Atlantic Ocean (7th paper) (Thesis Univ. van Amsterdam): 1-45, 5 tabs, 4 figs, 27 append.
- Pelseneer, P. and Fowler, G. H. 1906. Biscayan plankton collected during a cruise of H. M. S. 'Research', 1900, 7. Mollusca (excluding Cephalopoda). With a note on their distribution. Trans. Linn. Soc. London 2 (Zool.) 10(5): 137-157, pls 10-12.
- Pruvot-Fol, A. 1926. Mollusques ptéropodes gymnosomes provenant des campagnes du Prince Albert Ier de Monaco. Résult. Camp. Sci. accompl. sur son yacht par Albert Ier 70: 1-60, 3 pls.
- Pruvot-Fol, A. 1954. Mollusques opisthobranches. Faune de France 58. Paris (Lechevalier): 1-460, 173 figs, 1 pl.
- Spoel, S. van der 1972a. A taxonomic outline of the Gymnosomata (Mollusca). Basteria 36 (2-5): 75-88.
- Spoel, S. van der 1973e. Pneumodermopsis teschi n. sp. and notes on some other Pteropoda of the "Thor Expeditions 1903-1910" (Gastropoda). Bull. zool. Mus. Univ. Amst. 3 (9): 53-64.
- Spoel, S. van der 1976c. Pseudothecosomata, Gymnosomata and Heteropoda. Bohn, Scheltema & Holkema, Utrecht. 484 pp. 246 figs.
- Spoel, S. van der and Heyman, R. P. 1983. A comparative atlas of zooplankton. Biological patterns in the oceans. Bunge, Utrecht; Springer Verl., Berlin: 1-186.
- Starobogatov, J. I. 1971. Ordo Thecosomata; ordo Gymnosomata; ordo Heteropoda. In: Polevoy Zool. Inst. Akad. Moscou. opredeliteli planktona (without page or figure numbers, not bound, mimiographed). [in Russsian].
- Tesch, J. J. 1913c. Mollusca, Pteropoda. In: F. E. Schulze. Das Tierreich. Eine Zusammenstellung und Kennzeichnung der rezenten Tierformen 36. Berlin (Friedberger and Sohn): i-xvi, 1-154, 108 figs.
- Tesch, J. J. 1950a. The Gymnosomata. 2. Dana Rep. 6(36): 1-55, 37 figs.