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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.

Albergoni, A., 1975. Addensamento improvviso di Creseis acicula (Rang.)1828) in una baia del Mare Ligure. Conchiglie 11 (11/12): 233-236.

Almogi-Labin, A. and Reiss, Z., 1977a. Quaternary pteropods from Israel, 1. Holocene and Pleistocene pteropods from the Mediterranean continental shelf and slope of Israel; 2. Pteropods from Recent sediments in the Gulf of Elat. Rev. Españ. Micropaleont. 9(1): 5-48, 9 figs, 10 pls.

Almogi-Labin, A., Hemleben, C. and Deuser, W. G., 1988. Seasonal variation in the flux of euthecosomatous pteropods collected in a deep sediment trap in the Sargasso Sea. Deep-Sea Res., 35(3): 441-464, 4 tabs, 22 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.

Barash, A. and Danin, Z., 1971a. Opisthobranchia (Mollusca) from the Mediterranean waters of Israel. Israel J. Zool. 20 (First Ann. Symp. Israel Malac. Soc.): 151-200, 3 tabs, 3 pls, 2 maps.

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.

Bellini, R., 1905b. Les ptéropodes des terrains tertiaires en quaternaires d'Italie. Ann. Soc. r. zool. malac. Belgique 40: 23-45, figs 9-47.

Benoit, L., 1843. Ricerche malacologiche. Messina (Capra). Farfalletta. Opera periodica Scientifica Letteraria Artistica, Dispensa XI e XVI. Nuova Serie: 3-12, 2 pls.

Bianco, S. Lo, 1904. Pelagische Tiefseefischerei der 'Maya' in der Umgebung von Capri. In: Beitrege zur Kenntnis des Meeres und seiner Bewohner. Jena (G. Fischer Verlag): i-vi, 1-91, 179 figs, 1 map, 42 pls.

Biekart, J. W., 1989. Euthecosomatous pteropods as paleohydrological and paleoecological indicators in a Tyrrhenian deep-sea core. Palaeogeogr. Palaeoclim. Palaeoecol. 71: 205-224, 2 tabs, 6 figs, 2 pls.

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.

Boltovskoy, D., 1973. Los eutecosomados del Mar Argentino y adyacencias (Mollusca, Pteropoda). Physis (Asoc. Argent. Cienc. Natur.) (A)32(85): 395-411, 1 tab., 1 text-fig., 18 figs (on 2 pls).

Boltovskoy, D., 1975a. Ecological aspects of zooplankton (Foraminifera, Pteropoda and Chaetognatha) of the southwestern Atlantic Ocean. Veliger 18(2): 203-216, 3 tabs, 7 figs.

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.

Burgi, C. M. and Devos, C., 1962. Accumulation exceptionelle de Creseis acicula au long des cìtes dans la région de Banyuls-sur-Mer. Vie et Milieu 13: 391-392.

Casanova, B., Ducret, F. and Rampal, J., 1973. Zooplancton de Méditerranée orientale et de Mer Rouge (chaetognathes, euphausiacés, ptéropodes). Rapp. Proc.-verb. Réunions Comm. intern. Expl. Sci. Mer Méditerr. 21(8): 515-519.

Chen, C. and Bé, A. W. H., 1964b. Seasonal distributions of euthecosomatous pteropods in the surface waters of five stations in the western North Atlantic. Bull. Mar. Sci. Gulf Caribb. 14 (2): 185-220.

Chen, C. and Hillman, N. S., 1970. Shell-bearing pteropods as indicators of water masses off Cape Hatteras, North Carolina. Bull. Mar. Sci. Gulf Caribb. 20(2): 350-367, 4 tabs, 3 figs.

Coupin, H., 1892. Ptéropodes. In: Les mollusques, introduction à l'étude de leur organisation, développement, classification, affinités et principaux types. Paris (G. Carré): 179-192, figs 243-267.

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.

Orbigny, A. d', 1841-1855. Mollusques, 1. In: R. de la Sagra. Histoire physique, politique et naturelle de l'Ile de Cuba. Paris (Bertrand): 376 pp. (1855), atlas 28 pls (1853).

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. and Esnal, G. B., 1995. Abundance and assemblages of planktonic Tunicata (Chordata) and Thecosomata (Mollusca) off South Brazil. Physis, Secc. A. 50. (118-119): 25-30.

Dadon, J. R. and Magaldi, N. H., 1995. Mesoscale distribution of Thecosomata(Gastropoda) in the Brazil- Malvinas confluence compared with simultaneous satellite images of surface temperature. Iheringia, Sér. zool. 78: 157-160.

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

Dall, W. H., 1889a. A preliminary catalogue of the shell-bearing marine mollusks and brachiopods of the south-eastern coast of the United States, with illustrations of many of the species. Bull. U.S. nat Mus. 37: 3-221, 74 pls.

Jong, K. M. de, and Coomans, H. E., 1988. Marine Gastropods from Curaçao, Aruba and Bonaire. Sud. fauna Curaçao other Caribb. Isl. 121: 1-216.

Deshayes, G. P. and Milne Edwards, H., 1836. Histoire naturelle des animaux sans vertebres, présentant les caracteres généraux et particuliers de ces animaux, leur distribution, leurs classes, leurs familles, leurs genres, et la citation des principales especes qui s'y rapportent; précédée d'une introduction offrant la détermination des caracteres essentiels de l'animal, sa distinction du végétal et des autres corps naturels; enfin, l`exposition des principes fondamentaux de la zoologie, par J. B. P. A. de Lamarck. Deuxieme édition, revue et augmentée de notes présentant les faits nouveaux dont la science s'est enrichie jusqu'à ce jour, 7. Histoire des mollusques. Paris (J. B. Bailliere): 1-736.

Eschscholtz, F., 1829. Zoologischer Atlas, enthaltend Abbildungen und Beschreibungen neuer Thierarten, wehrend des Flottcapitains von Kotzebue zweiter Reise um die Welt, auf der Russisch-Kaiserlichen Kriegsschlupp Predpriaetiâ in den Jahren 1823-1826 beobachtet, 3. Berlin (G. Reimer): 1-18, pls 12-15.

Fiege, D., 1990a. Morphology of the wings of Euthecosomatous pteropods. Amer. Malacol. Bull. 8(1): 27-36.

Franc, A., 1959. 10 Mollusques pélagiques. Campagne de la 'Calypso': Gulfe de Guinée. Ann. Inst. Océanogr. (NS) 37(4): 241-244, 1 fig.

Froget, C. and Pastouret, L., 1972. Les ptéropodes, moyen d'étude de la chronoclimatologie quaternaire. Comparaison de deux carottes prélevées en Méditerranée occidental et orientale. Rapp. Comm. int. Explor. Sci. Mer Médit., Monaco 20(4): 611-614.

Frontier, S., 1963a. Héteropods et ptéropodes récoltes dans le plankton de Nosy-Bé. Cah. ORSTOM 6(2): 213-227.

Frontier, S., 1963c. Zooplancton récolté en mer d'Arabie, Golfe Persique et Golfe d'Aden, 2. Ptéropodes, systématique et répartition. Cahiers ORSTOM, sér. océanogr. 6 (sér. Nosy-Bé, 2): 233-254.

Frontier, S., 1965. Le problem des Creseis. Cah. ORSTOM (oceanogr.) 3 (2): 11-17.

Frontier, S., 1973b. Zooplancton de la région de Nosy-Bé, 6. Ptéropodes hétéropodes, premier partie: especes holonéritiques et néritiquesinternes. Cah. ORSTOM, Océanogr. 11(3): 273-289, 17 figs.

Furnestin, M. L., 1968. Le zooplancton de la Méditerranée (bassin occidental), essay de synthese. J. Cons. int. Explor. Mer, J. Cons. 32(1): 25-69, 9 figs.

Furnestin, M. L., 1979. Aspects of the zoogeography of Mediterranean plankton. In: S. van der Spoel and A. C. Pierrot-Bults (eds). Zoogeography and diversity in plankton. Utrecht (Bunge Sci. Publ.): 191-253.

Gabe, M., 1959. Particularités histochimiques de la glande hypobranchiale des ptéropodes thécosomes. Ann. Histochim. 4(2): 85-93.

Gasca, R. S. and Morales, E. S., 1992. Pteropodos (Mollusca: Gastropoda; Thecosomata) de la bahia de la Ascensionreserva de la biosfera de Sain Ka'an Quintana, Roo, México. In: Navarro, D and Suarez-Morales (eds). Diversidad biológica en la reserva de la biosfera de Sain Ka'an Quintana, Roo, México 2: 115-121.

Gegenbaur, C., 1855b. Untersuchungen über Pteropoden und Heteropoden. Ein Beitrag zur Anatomie und Entwicklungsgeschichte dieser Thiere. Leipzig (Engelmann): i-vii, 1-228, 8 pls.

Gerber, R. P. and Gerber, M. B., 1979. Ingestion of natural particulate organic matter and subsequent assimilation, respiration and growth by tropical lagoon zooplankton. Mar. Biol. Berl. 52(1): 33-43.

Geronimo, I. di, 1974b. Molluschi pelagici in livelli di marne mioceniche presso Vetto (R. Emilia). Conchiglie 10(9-10): 181-192, 1 pl.

Gilmer, R. W. and Harbison, G. R., 1986. Morphology and field behavious of pteropod molluscs: feeding methods in the families Cavoliniidae, Limacinidae and Peraclididae (Gastropoda: Thecosomata). Mar. Biol. 91: 47-57, 1 tab., 7 figs.

Gilmer, R. W., 1974. Some aspects of feeding in thecosomatous pteropod mollusks. Journal exp. mar. Biol. Ecol. 15: 127-144.

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

González, C. and Princz, D., 1979. Moluscos heteropodos y pteropodos de la zone central del caribe venezolano. Bol. Inst. oceonogr. Cumana 18(1-2): 99-107.

Goswami, S. C., 1983. Swarming of Creseis acicula Rang (Pteropoda) in the coastal waters of Goa. Madasagar 16(4): 459-462.

Gray, J. E., 1842a (44th edition). Synopsis of the contents of the British Museum. London (G. Woodfall).

Gray, J. E., 1846. A list of the genera of recent Mollusca, their synonyms and types. Proc. Zool. Soc. London 15: 129-219.

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.

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.

Grecchi, G. and Bertolotti, M., 1988 Interpretazione paleoclimatica della carota CG18-BAN82 basata sull'analisi di Thecosomata Euthecosomata del Quaternario del Mediterraneo orientale. Bull. Mus. Reg. Sci. Nat. Torino 6(1): 73-132.

Grecchi, G., 1975a. Pteropoda fossili a Castell'Arquato. Conchiglie 11(11-12): 225-232, 1 pl.

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.

Hedley, C., 1907a. The Mollusca of Mast Head Reef, Capricorn Group, Queensland. Proc. linn. Soc. N. S. W. 32(3)(127): 476-513, pls 16-21.

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.

Hirota, R., 1974. Zooplankton organisms found in Yatsushiro-kai, western Kyushu. Calanus 4: 16-24.

Hubendick, B., 1951. Pteropoda, with a new genus. Further zoological results of the Swedish Antarctic Expedition 1901-1903, 4(6): 1-10.

Ivanova, E. V., 1983 Pteropoda as indicators of palaeo-environment. Okeanologia 23 (5): 839-845. [in Russian]

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.

Kornicker, L. S., 1959. Observations on the behavior of the pteropods Creseis acicula Rang. Bull. Mar. Sci. Gulf Caribb. 9(3): 331-336, 1 tab., 2 photos.

Lankester, E. R., 1891. Zoological articles contributed to the Encyclopaedia Britannica. Mollusca (Repr. 'Encycl. Brit.'). London (A. C. Black): 95-158, 152 figs.

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.

Magaldi, N. H., 1977a. Moluscos holoplanctonicos del Atlantico suboccidental. III. Heteropods y pteropods de aguas superficiales Brasilenas y Uruguayas. Com. Soc. Malac. Urug. 4 (33): 295-325.

McGowan, J. A. and Fraundorf, V. J., 1966. The relationship between size and net used and estimates of zooplankton diversity. Limn. Oceanogr. 11(4): 456-469.

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.

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.

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.

Michel, H. B., Bebbehani, M., Herring, D., Arar, M., Shoushani, M. and Brakoniecki, T., 1986. Zooplankton diversity, distribution and abundance in Kuwait waters. Kuwait Bull. Mar. Sci 8: 37-105.

Moore, D. R., 1961. The marine and brackish water Mollusca of the State of Mississippi. Gulf Res. Rep. 1(1): 1-58.

Morioka, Y., 1980 Dense population of a pteropod, Creseis acicula in the neritic waters of the middle Japan Sea. Bull. Jap. Sea Reg. Fish. Res. Lab. 31: 169-171.

Naomi, T. S., 1988. On a swarm of Creseis acicula Rang (Pteropoda) in the Karwar waters. Indian J. Fish. 35(1): 64-65.

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.

Nishimura, S., 1960. Sea-bathers troubled with an emergence of the pricking Cresiid pteropod. Saisyu to Siiku 22: 74-75. [in Japanese]

Ode, H., 1991. Distribution and records of the marine mollusca in the North-West Gulf of Mexico. Texas Conch. 27(3/4): 72-83.

Okutani, T., 1957a. Holoplanktonic Gastropoda in the 'Kuroshio' area, south of Hinshu, May 1955. Rec. oceanogr. Wks. Japan, (NS) Spec. No.: 134-142, 3 figs.

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.

Peck, J. I., 1894. Scientific results of explorations by the U. S. Fish commission steamer Albatross, 26. Report on the pteropods and heteropods collected by the U. S. Fish commission steamer Albatross during the voyage from Norfolk, Va., to San Francisco, Cal., 1887-1888, 1. The thecosomatous pteropods. Proc. U. S. Nat. Museum, (1893) 16: 451-466, pls 53-55.

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., 1888b. Report on the Pteropoda collected by H. M. S. Challenger during the years 1873-1876, 3. Anatomy Reports on the scientific. Results of the voyage of H. M. S. Challenger during the years 1873-1876(zool.) 23(2): 1-97, 1 tab., 5 figs, 5 pls.

Peter, K. J. and Paulinose, V. T., 1978. Swarming of Creseis acicula Rang (Pteropoda) in the Bay of Bengal. Indian J. Mar. Sci. 7(2): 126-127.

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

Pillai, S. K. and Rodrigo, J. X., 1984. Swarming of Cresies acicula Rang (Pteropoda) in the Palk Bay off Mandapam. J. Mar. Bio. Assoc. India 21 B(1-2)(1979): 178-180.

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

Rampal, J., 1965a. Ptéropodes thécosomes indicateurs hydrologiques. Rev. Trav. Inst. Pàches Marit. (Paris) 29(4): 393-400, 5 figs.

Rampal, J., 1966. Pèches planctoniques superficielles et profondes en Méditerranée occidentale (campagne de la 'Thalassa', janvier 1961, entre les îles Baléares, la Sardaigne et l'Algérois, 6). Ptéropodes. Rev. Trav. Inst. Pàches Marit. (Paris) 30: 375-383, 6 figs.

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., 1968b. Neurosécrétion chez quelques ptéropodes thécosomes. Rapp. Proc.-verb. Réunion Comm. intern. Explor. scient. Mer Médit. 19(3): 543-545, 1 fig.

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., 1977b. Diversité de structure de la coquille chez les thécosomes. Atti Soc. Ital. Sci. Nat. Museo Civ. St. Nat. Milano 118(2): 207-211, 1 fig.

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

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

Rampal, J., 1985b. Systematique du genre Creseis. Rapp. Comm. int. Mer Médit. 29 (9): 259-236.

Rang, P. C. A. L., 1828b. Notice sur quelques mollusques nouveaux appartenant au genre Cléodore, et établissement et monographie du sous-genre Créseis. Ann. Sci. Nat. 13: 302-319, pls 17-18.

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.

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

Riedl, R., 1970. Fauna und Flora der Adria. 2° Ed. Hamburg, Berlin (Verlag P. Parey): 1-702.

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

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

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. and Haridas, P., 1974 Synchronization in the occurrence of Trichodesmium bloom and swarming of Creseis acicula Rang (Pteropoda) and Penilia avirostris Dana (Cladocera) in the area off Cochin. Mahasagar 7: 61-64.

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., 1975. A note an the annual variation of the euthecosomatous pteropods along the meridian 78° East in the Indian Ocean. Bull. Plank. Soc. Japan 21: 41-44.

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.

Sanchez Nava, S. A., 1984. Sistemática, distribución y abundancia de los moluscos pelágicos (Gastropoda: heteropoda y Pteropoda) en el Diomo de Costa Rica. (Ph. D Thesis Univ. Nacional Autonomia de Mexico): 1-180 (mimiogr).

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

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Creseis acicula acicula