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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.

Almogi-Labin, A., 1975. Pleistocene and holocene pteropods from the eastern Mediterranean and the Gulf of Elat. 4th Rap. H. Steinitz Mar. biol. Lab. Elat: 14-15 (mimiogr.).

Almogi-Labin, A., 1982. Stratigraphic and paleoceanographic significance of Late Quaternary pteropods from deep-sea cores in the Gulf of Aqaba (Elat) and northernmost Red Sea. Marine Micropal. 7(1): 53-72.

Almogi-Labin, A., 1984. Population dynamics of planktonic Foraminifera and Pteropoda, Gulf of Aqaba, Red Sea. Proc. Koninkl. Nederl. Akad. Wetensch. (B9)87(4): 481-511.

Bé, A. W. H. and Gilmer, A. W., 1977. A zoogeographic and taxonomic review of euthecosomatous Pteropoda. In: A. T. S., Ramsay (ed). Oceanic Micropalaeontology I. Acad. Press London: 733-808.

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.

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.

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.

Croce, N. della and Frontier, S., 1966. Thecosomatous pteropods from the Mozambique Channel. Boll. Mus. Inst. Biol. Univ. Genova 34(207): 107-113, map.

Glaçon, G., Rampal, J., Gaspard, D., Guillaumin, D. and Staerker, T. S., 1994. Thecosomata (pteropods) and their remains in Late Quaternary deposits on the Bougainville Guyot and the Central New Hibrides Island Arc. Proc. Ocean Dril. Progr. Sci. Res. 134: 319-334

Grazzini, V. C. and Rosenberg, H. Y., 1969. Étude paléoclimatique d'une carotte de Méditerranée orientale. Revue Geogr. phys. Géol. dynam. (2)11(3): 279-292, 3 figs, 1 pl.

Herman, Y., 1971b. Vertical and horizontal distribution of pteropods in quaternary sequences. In: B. M. Funnel and W. R. Riedel. The micropalaeontology of oceans: 468-486. Univ. Press, Cambridge.

Ivanova, E. V., 1985. Late Quaternary biostratigraphy and paleotemperatures of the Red Sea and the Gulf of Aden based on planktonic Foraminifera and pteropods. Mar. Micropal. 9: 335-364.

Knocker, H. H., 1868. On pelagic shells collected during a voyage from Vancouver Island to this country. Proc. Sci. Meet. Zool. Soc. London (1868): 615-622.

McGowan, J. A., 1960. The systematics, distribution, and abundance of the Euthecosomata of the North Pacific. San Diego (Ph. D. thesis University of California): 1-212, 17 tabs, 54 figs.

McGowan, J. A., 1967. Distributional atlas of pelagic molluscs in the California Current region. CALCOFI Atlas 6: 1-218.

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.

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.

Rampal, J., 1990. Les Thecosomes de la mer Rouge. Bull. Inst. Oceanogr. Monaco (spec.) 7: 103-107.

Rao, T. S. S., 1979. Zoogeography of the Indian Ocean. In: Spoel, S. van der and Pierrot-Bults, A. C. (eds). Zoogeography and diversity in plankton. Utrecht (Bunge Sci. Publ.): 254-292.

Sakthivel, M., 1976a. Geographical and seasonal distribution of Euthecosomata (Pteropoda, Gastropoda) in the Indian Ocean. Meteor Forsch. Ergebniss D23: 1-22.

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

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.

Turekian, K. K., Katz, A. and Chan, L., 1973. Trace element trapping in pteropod tests. Limn. Oceanogr. 18(2): 240-249.

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 and Pierrot-Bults, A. C., 1979. Zoogeography of the Pacific Ocean. In: S. van der Spoel and A. C. Pierrot-Bults (eds). Zoogeography and diversity in plankton. Utrecht (Bunge Sci. Publ.): 293-327.

Spoel, S. van der, 1962a. Aberrant forms of the genus Clio Linnaeus, 1767 with a review of the genus Proclio Hubendick, 1951. Beaufortia 9 (107): 173-200.

Spoel, S. van der, 1963. A new forma of the species Clio pyramidata Linnaeus, 1767 and a new resting stage of Clio pyramidata Linnaeus, 1767 forma sulcata (Pfeffer, 1879) (Gastropoda, Pteropoda). Beaufortia 10 (114): 19-28.

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

Spoel, S. van der, 1969b. The shell of Clio pyramidata Linnaeus, 1767 forma lanceolata (Lesueur, 1813) and forma convexa (Boas, 1886)(Gastropoda, Pteropoda). Vidensk. Medd. Dansk. Natur. Foren. 132: 95-114.

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, 1971b. Some problems in infraspecific classification of holoplanktonic animals. Zeitschr. Zool. Syst. Evol. 9 (2): 107-138.

Spoel, S. van der, 1973a. Clio pyramidata Linnaeus, 1767 forma convexa (Boas, 1886) (Mollusca, Pteropoda). Bull. zool. Mus. Univ. Amst. 3 (3): 15-20.

Spoel, S. van der, 1973f. Strobilation in a mollusc; the development of aberrant stages in Clio pyramidata Linnaeus, 1767 (Gastropoda, Pteropoda). Bijdr. Dierk. 43 (2): 202-215, pls I-II.

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

Spoel, S. van der, 1983a. Patterns in plankton distribution and their relation to speciation. The dawn of pelagic biogeography. In: Sims, R. W., Price, J. H. and Whalley, P. E. S. (Eds). Evolution, time and space: the emergence of the biosphere. London, Acad. Press: 291-334.

Spoel, S. van der, 1988. Patterns in plankton distribution and their relation to speciation. The dawn of pelagic biogeography. In: R. W. Sims, J. H. Price and P. E. S. Whalley (Eds) [S. I. Golovania et al(transl.)] . Evolution, time and space: the emergence of the biosphere. Moskva, Progress: 251-290.

Yaron, I., 1977. A preliminary list of the shell-bearing pelagic gastropods of the Gulf of Eilat. Levantina Malac. Newsl. 8: 75-77.

Clio convexa