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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.

Adams, A. and Adams, A., 1858. The genera of recent Mollusca. J. v. Voorst, London vol. 2: 1-68, vol. 3, pls. 56-136.

Benson, W. H., 1861. Notes on the pteropodous genus Hyalaea, and description of a new species. Ann. Mag. nat. Hist. (3)7(37): 21-28.

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.

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.

Casanova, J.-P., 1980. Campagnes du 'Meteor' dans 'Atlantique N-E. Siphonophores, méduses et thécosomes. Distribution verticale et comparaisons faunistiques avec la Méditerranée. 'Meteor' Forschungserg. (D)32: 15-32, 6 tabs, 6 figs.

Orbigny, A. d', 1836-1846. Voyage dans l'Amérique méridionale (le Brésil, la république orientale de l'Uruguay, la république Argentine, la Patagonie, la république du Chili, la république de Bolivia, la république du Pérou), exécuté pendant les années 1826, 1827, 1828, 1829, 1830, 1831, 1832 et 1833, 5(3). Mollusques. Paris (Bertrand).

1-48 are from 1835.

49-184 are from 1836.

185-376 are from 1837.

377-408 are from 1840.

409-488 are from 1841.

489-758 are from 1846.

atlas 20 pls is from 1846.

Blainville, [H. M. D.] de, 1821a. (Malacoz.). Dictionnaire des Sciences Naturelles 22: 1-570.

Gray, J. E., 1850. Catalogue of the Mollusca in the collection of the British Museum, 2. Pteropoda. London (British Museum, E. Newman): iv + 45 pp.

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.

Hilgersom, P. and Spoel, S. van der, 1987. East-West variation in Diacria off Northwest Africa. Malac. Rev. 20: 97-104.

Locard, A., 1897. Mollusques testacés, 1. In: A. Milne-Edwards (ed.). Expédition scientifique du Travailleur et du Talisman pendant les années 1880, 1881, 1882, 1883. Paris (Masson and Cie): i-vi, 1-516, 22 pls.

Massy, A. L., 1909. The Pteropoda and Heteropoda of the coast of Ireland Fisheries, Ireland. Scient. Invest. Dept. Agric. Techn. Instruct. Ireland 2: 1-52, pl. 1.

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.

Metz, J. A. J., 1964. Enige opmerkingen over de in Nederland gevonden pteropoden en heteropoden. Het Zeepaard 24(3): 35-45, 14 figs, 1 map.

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., 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.

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.

Panhorst, W. L. and Spoel, S. van der, 1974. Notes on the adults and young stages in Diacria (Gastropoda, Pteropoda). Basteria 38: 19-26.

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.

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.

Souleyet, [F. L. A.], 1852a. In: Eydoux, [F.] and Souleyet, [F. L. A.]. Voyage autour du monde exécuté pendant les années 1836 et 1837 sur la corvette 'La Bonite', commandée par M. Vaillant, capitaine de vaisseau, publié par ordre du Gouvernement sous les auspices du département de la marine. Zoologie, 2. Paris (A. Bertrand): 1-664. Atlas (undated): 8 pp., mammifäres pls 1-12, oiseaux pls 1-10, reptiles pls 1-10, poissons pls 1-10, crustacés pls 1-5, insectes pls 1-2, mollusques pls 1-15, 15bis, 16-23, 23bis, 24, 24bis, 24 A-E, 25-45, zoophytes pls 1-2, vers pl. 1.

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

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.

Thiede, J., 1975b. Shell- and skeleton- producing plankton and nekton in the Eastern North Atlantic Ocean. 'Meteor' Forschungsergeb. (C)20: 33-79.

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

Spoel, S. van der, 1973b. Growth, reproduction and vertical migration in Clio pyramidata Linnaeus, 1767 forma lanceolata (Lesueur, 1813) with notes on some other Cavoliniidae (Mollsuca, Pteropoda). Beaufortia 21 (281): 117-134.

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, 1982b. Intermediates between Diacria trispinosa and D. rampali (Mollusca, Pteropoda). Basteria 46(5/6): 121-123.

Vayssiére, A., 1915a. Mollusques euptéropodes (ptéropodes thécosomes) provenant des campagnes des yachts Hirondelle et Princesse-Alice (1885-1913). Résul. Camp. Scient. accompl. yacht par Albert Ier, prince souverain de Monaco 47: 1-226, 14 pls.

Velásquez, T. L. E. and Lozano, B. F., 1987. Algunos pteropodos euthecosomata (Mollusca: Opisthobranchia) de la Bahia de gaira, Santa Marta (Caribe Colombiano). An. Inst. Inv. Punta de Betín 17: 81-85.

Diacria major