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Gilmer, R. W., 1987. Response to "Fact or artifact?" by S. van der Spoel. Veliger 30(2): 207.

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Pafort-van Iersel, G. J. S., 1982. Variation in Diacria trispinosa (de Blainville, 1821) and Clio pyramidata Linnaeus, 1767 (Pteropoda, Mollusca) of the Amsterdam Mid North Atlantic Plankton Expedition 1980. Beaufortia 32(6): 97-115, 6 tabs, 8 figs, 1 pl.

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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.

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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., 1985a. Distribution des Mollusques Thécosome en mer Rouge Meridionale. Rapp. Comm. int. Mer Médit., 29 (9): 265-267.

Rheder, H. A., 1942. Geology and biology of the North Atlantioc Deep-sea cores between Newfoundland and Ireland. 5 Mollusca. Prof. Pap. 196(D): 107-125.

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

Roissy, F. de, 1805 (an 13). Histoire naturelle, générale et particuliäre, des mollusques, animaux sans vertèbres et á sang blanc. Ouvrage faisant suite aux oeuvres de Leclerc de Buffon, et partie du cours complet d'histoire naturelle rédigé par C. S. Sonnini, membre de plusieurs sociétés savantes, 5. Paris (Dufart): 1-480.

Roskin, G., 1925c. Über die structur der glatten Muskelzellen, die Muskelzellen der Pteropoda. Z. Zellforsch. mikr. Anat. 5: 771-794.

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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., 1904. The Thecosomata and Gymnosomata of the Siboga Expedition. Siboga Rep. 52: 1-92, 156 figs.

Tesch, J. J., 1908. The Pteropoda of the Leyden museum. Notes Leiden Mus. 29: 181-203, pl. 7.

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Tesch, J. J., 1947. Pteropoda Thecosomata. Fiches; conseil Intern. Expl. Mer. Zooplankton (sheet)8: 1-6, 13 figs.

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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, 1964a. Notes on some pteropods from the North Atlantic. Beaufortia 10 (121): 167-176.

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

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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, 1969c. Two new forms of Cavolinia uncinata (Rang, 1829)(Pteropoda, Gastropoda). Beaufortia 16 (220): 185-198.

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

Spoel, S. van der, 1972b. Pteropoda, Thecosomata. Cons. int. Expl. Mer. Zooplankton Sheet 140-142: 1-12.

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, 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, 1975a. Preliminary note on variation of protoconchae of Clio pyramidata Linnaeus, 1767 (Mollusca, Pteropoda). Bull. zool. Mus. Univer. Amst. 4 (21): 187-190.

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

Spoel, S. van der, 1977a. Pteropoden in sedimenten. Corr. blad N. M. V. 176: 669-670 [summary of lecture].

Spoel, S. van der, 1978. Clio bartletti n. sp., a fossil new to science closely related to Clio cuspidata (Gastropoda, Thecosomata). Bull. zool. Mus. Univ. Amst. 6 (15): 109-113.

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Spoel, S. van der, 1987c. Facts or artefacts. Veliger 30 (2): 206-210.

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Clio pyramidata pyramidata