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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.

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.

Chen, C., 1966. Calcareous zooplankton in the Scotia Sea and Drake Passage. Nature 212(5063): 678-681.

Chen, C., 1968b. The distribution of thecosomatous pteropods in relation to the Antarctic convergence. Antarctic J. U. S., (Sept.-Oct. 1968): 155-157, 6 figs.

Chen, C., 1978. Ecology of thecosomatous pteropods in the Scotia Sea and adjacent areas, Antarctic. Bull. Malac. R. O. C. 5: 1-22.

Dadon, J. R. and Boltovskoy, D., 1982. Zooplanktonic recurrent groups (Pteropoda, Euphausiacea, Chaetognatha) in the southeastern Atlantic Ocean. Physis Secc., (A)41(100): 63-83.

Dadon, J. R., 1984a. Distribution y abundancia de pteropoda Thecosomata en el Atlantico Sudoccidental. Physis (Buenos Aires)(A) 42(102): 25-38.

Dadon, J. R., 1986 Distribucion y abundancia de pteropoda Thecosomata (Mollusca, Gastropoda) del Mart epicontinenetal Argentino y adyacencias Junio y Julio de 1978. Physis (Buenos Aires)(A) 44(106): 43-50.

Dadon, J. R., 1989. Pteropoda Euthecosomata del Mar Epicontinental Argentino y Adyacencias. Thesis Univ. Buenos Aires: 1-285. (mimiogr.)

Dadon, J. R., 1993. Thecosomata (Gastropoda) del oceano Antartico. Comsejo nacional de investigaciones cientificas y tecnicas, Instituto Antartico Argentino, Direccion nacional del Antartico: 49-52

Kennett, J. P., 1979. Recent zoogeography of antarctic plankton microfossils. In: Spoel, S. van der and Pierrot-Bults, A. C. (eds). Zoogeography and diversity in plankton. Utrecht (Bunge Sci. Publ.): 328-355.

Massy, A. L., 1920. Eupteropoda (Pteropoda Thecosomata) and Pterota (Pteropoda Gymnosomata). British Antarctic ('Terra Nova') Expedition 1910, Nat. Hist. Rep., Zoology 2(9). Mollusca, 3: 203-232, 9 figs.

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

Pelseneer, P., 1888a. Report on the Pteropoda collected by H. M. S. Challenger during the years 1873-1876, 2. The Thecosomata Reports on the scientific. Results of the voyage of H. M. S. Challenger during the years 1873-1876 (zool.) 23(1): 1-132, 2 figs, 2 pls.

Pelseneer, P., 1903. Mollusques (amphineures, gastéropodes et lamellibranches). In: Rés. Voy. S. Y. Belgica en 1897-1899. Zoologie, 6-9. Anvers (J. E. Buschmann): 1-85, 9 pls, 2 maps.

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.

Piatkowski, U., Rodhouse, P. C., White, M. G., Bone, D. G. and Symon, C., 1994. Nekton community of the Scotia Sea as sampled by the RMT 25 during austral summer. Mar. Ecol. Progr. Ser. 122: 13-26.

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.

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.

Richter, G., 1977. Jäger, Fallensteller und Sammler. Zur Ernährung planktonischer Schnecken. Natur und Museum 107: 221-234.

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.

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.

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., 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.

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

Spoel, S. van der and Boltovskoy, D., 1981. Pteropoda. In: Boltovskoy, D. (ed.). Atlas del zooplancton del Atlantico Sudoccidental. Publ. INIDEP Argentina: 493-512.

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, Boltovskoy, D. and Jankivich, S. S., 1981. Classification y distribucion. In: Boltovskoy, D. (ed.). Atlas del zooplancton del Atlantico Sudoccidental. Publ. INIDEP Argentina: 512-524.

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, 1965. Differentiation in the pteropod Clio pyramidata Linnnaeus, 1767 forma sulcata (Pfeffer, 1879). Basteria 29 (1-4): 62-65.

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

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, 1981a. Descripcion de los conchas embrionarias de Cavoliniidae. In: Boltovskoy, D. (ed.). Atlas del zooplancton del Atlantico Sudoccidental. Publ. INIDEP Argentina: 525-531.

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, 1983b. Sur la répartition, la variation et la réproduction de quelques mollusques planctoniques (Ptéropodes). BIOMAR Univ. Bruxelles 2: 79-92.

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.

Witek, Z., Kittel, W., Czykieta, H. Zmijewska, M. I. and Presler, E., 1985. Macrozooplankton in the southern Drake Passage and in the Bransfield Strait during Biomass-Sibex (December 1983-January 1984). Polish Pol. Res. 6 (1-2): 95-115.

Clio pyramidata sulcata