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Deevey, G. B., 1971. The annual cycle in quantity and composition of the zoo-plankton of the Sargasso Sea off Bermuda, 1. The upper 500 m. Limn. Oceanogr. 16(2): 219-240.

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Diester-Haass, L. and Spoel, S. van der, 1978. Late Pleistocene pteropod-rich sediment layer in the N. E. Atlantic and protoconch variation of Clio pyramidata Linnaeus, 1767. Palaeogeogr., Palaeoclim., Palaeoecol. 24: 85-109.

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Furnestin, M. L., 1978. Planktonic molluscs as hydrological and ecological indicators. In: S. van der Spoel, et al. (eds). Pathways in malacology. Utrecht (Bohn, Scheltema & Holkema): 175-194.

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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

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Grecchi, G., 1982. Pteropodi pliocenici dell'Italia settentrionale. Riv. Ital. Paleont. 87(4): 703-738, 2 tabs, 5 figs, pls 52-54.

Grecchi, G., 1984. Molluschi planctonici e bentonici in sedimenti sapropelitici del Quaternario della dorsalee Mediterranea. Boll. Malacologico 20(1-4): 1-34, 3 pls.

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.

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.

Hida, T. S., 1957. Chaetognaths and pteropods as biological indicators in the North Pacific. U. S. Fish and Wildlife Service, Special Science. Report Fisheries 215: 1-13.

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.

Janssen, A. W., 1975. Systematische lijst van Nederlandse recente en fossiele mollusken. Meded. Werkgr. Tret. Kwartaire Geol. 12 (4): 115-170.

Kramp, P. L., 1922. Kinetocodium danae n. g., n. sp. a new gymnoblastic hydroid parasitic in pteropod. Meddr Dansk naturhist. Foren. KÌbenhavn 74: 1-21, 8 figs, 1 pl.

Lesson, R. P., 1830. Zoologie, 2(1)(11). Mollusques, annélides et vers, 1. Mollusques. In: Duperrey, L. I. (ed.). Voyage autour du monde, exécuté par ordre du roy, sur la corvette de sa majesté, La Coquille, pendant les années 1822, 1823, 1824 et 1825, sous le ministere et conformément aux instructions de S. E. M., le Marquis de Clermont Tonnerre, ministre de la marine et publié sous les auspices de son excellence Mgr. le Cte de Chabrol, ministre de la marine et des colonies. Paris (Bertrand): 239-448(1826?).

Magaldi, N. H., 1974. Moluscos holoplanktonicos del Atlantico sudoccidental. I Pteropodos euthecosomados colectados por el "Atlantis II" en marzo de 1971. Comunicac. Soc. Malacol. Uruguay 4(27): 1-20.

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.

McGowan, J. A., 1968. The Thecosomata and Gymnosomata of California. Veliger 3 (suppl.): 103-130, pls 12-20.

McKay, D. W., 1974. Pteropods of Scottish and adjacent waters. J. Conchology 28(3): 179-184.

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

Menzies, R. J., 1958. Shell-bearing pteropod gastropods from mediterranean plankton (Cavoliniidae). Pubbl. Staz. Zoologica Napoli 30 (3): 381-401, 5 tabs, 9 figs, 8 maps.

Morton, J. E., 1964. Locomotion. In: Wilburg, K. M. and Yonge, C. M. (eds). Physiology of Mollusca I, N.Y., London (Academic Press): 383-423, 28 figs.

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.

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.

Pelseneer, P. and Fowler, G. H., 1906. Biscayan plankton collected during a cruise of H. M. S. 'Research', 1900, 7. Mollusca (excluding Cephalopoda). With a note on their distribution. Trans. Linn. Soc. London 2 (Zool.) 10(5): 137-157, pls 10-12.

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.

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

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

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Rampal, J., 1965b. Variations morphologiques au cours de la croissance d'Euclio cuspidata (Bosc) (ptéropode thécosome). Bull. Inst. océanogr. 65 (1360): 1-12.

Rampal, J., 1967. Répartition quantitative et bathymétrique des ptéropodes thécosomés récoltés en Méditerranéee occidentale au Nord du 40° parallèle. Remarques morphologiques sur certaines espèces. Rev. Trav. Inst. Pèches Marit. (Paris) 31(4): 1-13.

Rampal, J., 1968a. Les ptéropodes thécosomes en Méditerranée. Comm. Int. Explor. sci. Mer Méditerr.: 1-142, 6 tabs, 12 figs. (PhD thesis).

Rampal, J. 1971a. Les thécosome d'une thanatocoenose du N. W. du Golf de Gascogne. In: Peuplements profonds du Golf de Gascogne: 549-550.

Rampal, J., 1973a. Clés de détermination des ptéropodes thécosomes de Méditerranée et de l'Atlantique euroafricain. Rev. Trav. Inst. Pàches Marit. (Paris) 37(3): 369-381.

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., 1980a. Biogeographie Méditerranéne d'apres l'etude des Thécosome (Mollusques pelagiques). J. Etud. Syst. Biogeogr. Médit Cagliari CIESM: 45-54.

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Richter, G., 1973b. Zur Stammesgeschichte pelagischer Gastropoden. Natur und Museum 103(8): 265-275, 4 tabs, 9 figs.

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.

Ros, J., 1976. Catálogo provisional de los Opistobranquios (Gastropoda, Euthyneura) de las costas ibéricas. Miscel. Zool. 3(5): 21-48.

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.

Sakthivel, M., 1967. A preliminary report on the distribution and relative abundance of Euthecosomata with a note on the seasonal variation of Limacina species in the Indian Ocean. In: Proc. Symp. 'Indian Ocean' March 1967. Bull. N. I. S. I. 38: 700-717, 17 figs.

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

Sakthivel, M., 1977. Further studies of plankton ecosystems in the eastern Indian Ocean, 8. Seasonal, diurnul and latitudinal variations in abundance of Euthecosomata along the 110° meridian. Aust. J. Mar. Freshw. Research 28(5): 663-671.

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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]

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

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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Wormuth, J. H., 1985. The role of cold-core Gulf Stream rings in the temporal and spatial patterns of euthecosomatous pteropods. Deep-sea Res. 32(7): 773-788.

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Yamaji, I., 1991. Illustrations of the marine plankton of Japan. 3°Ed. Hoikusha Publ. Co. Ltd, Osaka.: 1-538.

Clio cuspidata