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Abbott, R. T., 1974. (2 ed.). American seashells. New York, Cincinnati, Toronto, London, Melbourne (van Nostrand Reinhold Co.): 1-663, 6405 figs.

Berkeley, E. and Berkeley, C., 1960. Some further records of pelagic Polychaeta from the northeast Pacific north of latitude 40°N and east of longitude 175°W, together with records of Siphonophora, Mollusca and Tunicata from the same region. Can. J. Zool. 38: 787-799.

Kwietniewski, C., 1910. Ueber die Larven eines unbekannten gymnosomen Pteropoden. Zool. Anz. 36(14-15): 257-271, 9 figs.

Meisenheimer, J., 1903b. Über eine neue Familie der gymnosomen Pteropoden aus dem Material der Deutschen Tiefsee Expedition (Pteroceaniden). Zool. Anz. 26: 92-99, 2 figs.

Meisenheimer, J., 1905c. Pteropoda. Deutsch. Tiefsee Exp. 1898-1899 IX: 1-314, Atlas Pl. 1-27 Map 1-9.

Meisenheimer, J., 1905c. Pteropoda. Deutsch. Tiefsee Exp. 1898-1899 IX: 1-314, Atlas Pl. 1-27 Map 1-9.

Morton, J. E., 1957a. Opisthobranch Mollusca, Gymnosomata fam. Clionidae. Fiches, Cons. intern. Explor. Mer, Zooplankton- sheet 80: 1-4, 7 figs.

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.

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., 1942. Les gymnosomes.I . Dana Rep. 4 (20): 1-54, 77 figs.

Pruvot-Fol, A., 1954. Mollusques opisthobranches. Faune de France 58. Paris (Lechevalier): 1-460, 173 figs, 1 pl.

Schalk, P. H. and Spoel, S. van der, 1988. Disobeying biogeographic laws: on the shallow occurence of deep-sea medusae and other organisms in the Indonesian waters. Plankt. Newsl. 8: 4-6.

Schiemenz, P., 1906. Die Pteropoden der Plankton Expedition. Erg. Plankt. Exp. Humboldt Stift. 2 F.b.: 1-37.

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.

Spoel, S. van der and Schalk, P. H., 1988. Unique deviations in depth distribution of deep-sea forms. Deep Sea Res. 35 (7): 1185-1193.

Spoel, S. van der, 1970b. The pelagic Mollusca from the 'Atlantide' and 'Galathea' expeditions collected in the East Atlantic. Atlantide Reports 11: 99-139, 24 figs.

Spoel, S. van der, 1971d. The pelagic Mollusca from the "Atlantide" and "Galathea" Expeditions collected in the East Atlantic. Atlantide Rep. 11: 99-139.

Spoel, S. van der, 1972a. A taxonomic outline of the Gymnosomata (Mollusca). Basteria 36 (2-5): 75-88.

Spoel, S. van der, 1976c. Pseudothecosomata, Gymnosomata and Heteropoda. Bohn, Scheltema & Holkema, Utrecht. 484 pp. 246 figs.

Spoel, S. van der, 1987d. Five Pteropod species new for the Gulf of Alaska. Biol. Oceanogr. 5: 29-42.

Zhang, F., 1964. The pelagic molluscs off the China coast, 1. A systematic study of Pteropoda (Opisthobranchia), Heteropoda (Prosobranchia) and Janthinidae (Ptenoglossa, Prosobranchia). Stud. Mar. Sinica 5: 125-226.

Zheng Zhong (et al.), 1989. Marine Planktology. China Ocean Press. Bejing: i-viii, 1-454. [transl. from Chinese orig.]

Thliptodon diaphanus