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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.

Bleeker, J. and Spoel, S. van der, 1988. Diacria piccola and Diacria maculata: two new pteropod mollusc species from the Atlantic and Pacific oceans. Proc. biol. Soc. Wash. 101(1): 60-66, 11 figs.

Boas, J. E. V., 1886a. Bidrag til Pteropodernes. Morfologi of Systematik samt til Kundskaben om deres geografiske Udbredelse- Spolia Atlantica- Vidensk. Selsk. Skr. (6 Raekke) naturv. math. IV (1): 1-231.

Haagensen, D. A., 1976 Caribbean zooplankton. Part II. Thecosomata. Off. Nav. Res. Dept. of the Navy. U. S. Govt. Print Off. Washington D. C.: 551-712.

Leyen, A. van and Spoel, S. van der, 1982. A new taxonomic and zoogeographic interpretation of the Diacria quadridentata group (Pteropoda, Mollusca). Bull. zool. Mus. Univ. Amst. 8 (13): 101-118

Newman, L. J., 1990. Holoplanktonic molluscs (Gastropoda; Thecosomata, Gymnosomata, and Heteropoda) from the waters of Australia and Papua New Guinea: their taxonomy, distribution and biology. PhD Thesis Univ. Qld. Australia. 208 pp.

Pfeffer, G., 1879 (1880a). Übersicht der während der Reise um die Erde in den Jahren 1874-1876 auf S. M. Schiff 'Gazelle' und von Hrn. Dr. F. Jagor auf seiner Reise nach den Philippinen in den Jahren 1857-1861 gesammelten Pteropoden. Monatsber. Kgl. Preuss. Akad. Wiss. Berlin (1879): 230-246, 20 figs.

Pfeffer, G., 1880b. Die Pteropoden des Hamburger Museums. Abhandlu. Naturwissensch. Ver. Hamburg 7: 69-99, pl. 7.

Rampal, J., 1975. Les thécosomes (mollusques pélagiques). Systématique et évolution écologie et biogéographie méditerranéennes. Aix-Marseille (Thesis Univ. Provence CNRS AO 11932): 1-485, 15 tabs, 99 figs.

Richter, G., 1979. Die thecosomen Pteropoden der "Meteor"-Expedition in den Indischen Ozean 1964/65. "Meteor" Forsch. Ergebnisse (D) 29: 1-29.

Rottman, M., 1976. Euthecosomatous pteropods (Mollusca) in the Gulf of Thailand and the South China Sea: seasonal distribution and species associations. Naga Rep. 4 (6): 1-117.

Rottmann, M. L., 1978. Ecology and recurrent groups of pteropods, euphasiids and chaetognaths in the Gulf of Thailand and the South China Sea. Mar. Biol. 48(1): 63-78, 7 tabs, 4 figs.

Schalk, P. H., 1990. Spatial and seasonal variation in pteropods (Mollusca) of Indo-malayan waters related to watermass distribution. Mar. Biol. 105: 59-71.

Sowerby, G. B., 1878. In: Reeve, L. A.: Conchologia iconica or illustrations of shells of molluscous animals. Monograph of the genus Pteropoda vol. 20, in front pls 1-7 and pls 1-6, Reeve and Co, London.

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., 1946. The thecosomatous pteropods, 1. The Atlantic. Dana Report 28: 1-82, 37 figs, 8 pls.

Tesch, J. J., 1948. The thecosomatous pteropods, 2. The Indo-Pacific. Dana Report 30: 1-45, 34 figs, 3 pls.

Troschel, F. H., 1854. Beiträge zur Kenntniss der Pteropoden. Arch. Naturgeschichte 20(1): 196-241, pls 8-10.

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.

Spoel, S. van der, 1967. Euthecosomata, a group with remarkable developmental stages (Gastropoda, Pteropoda). J. Noorduyn and Zn, Gorinchem, 375 pp.

Summary (in Dutch also published separately)

Spoel, S. van der, 1968a. A new forma of Diacria quadridentata (Blainville, 1821) and shell growth in this species (Gastropoda, Pteropoda). Vidensk. Medd. Dansk. Natur. Foren. 131: 217-224.

Spoel, S. van der, 1968b. The shell and its shape in Cavoliniidae (Pteropoda Gastropoda). Beaufortia 15 (206): 185-189.

Spoel, S. van der, 1969a. Diacria quadridentata forma danae van der Spoel, from the Atlantic Ocean. Basteria 33 (5-6): 105-107.

Spoel, S. van der, 1970a. Morphometric data in Cavoliniidae with notes on a new forma of Cuvierina columnella (Rang, 1927) (Gastropoda, Pteropoda). Basteria 34 (5-6): 103-151.

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, 1971a. New forms of Diacria quadridentata (de Blainville, 1821), Cavolinia longirostris (de Blainville, 1821) and Cavolinia uncinata (Rang, 1829) from the Red Sea and the East Pacific Ocean (Mollusca, Pteropoda). Beaufortia 19 (243): 1-20.

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, 1973c. Hyalea orbignii Rang, 1827 a fossil Cavolinia species (Mollusca, Pteropoda). Basteria 37 (1-2): 21-24.

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

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.

Diacria costata