Abstract
Observations on breeding season, copulation, spawning, and development are described for Paedoclione doliiformis, the only gymnosomatous pteropod which consistently retains external larval features throughout its life. The number of eggs spawned per individual is dependent upon temperature and availability of Spiratella retroversa, its thecosome prey. At 17° to 19°C, planktotrophic veligers hatch from floating egg masses within 3 days, and cast their shells approximately 11 days later. The resultant shell-less veligers could complete metamorphosis to the polytrochous larval stage, in which the body is encircled by 3 ciliary bands, within 12 h. Some polytrochous larvae begin feeding on veligers of S. retroversa within 2 days. Unlike other gymnosome species, there is no further change in external appearance except for growth. A comparison of reproduction and development has been made with Clione limacina, another gymnosome which competes for food with P. doliiformis in Nova Scotian (Canada) coastal waters.
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Literature Cited
Boas, J. E. V.: Spolia Atlantica. Bidrag til Pteropodernes. Morfologi og Systematik samt til Kundskaben om deres geografiski Udbredelse. K. danske Vidensk. Selsk. Skr. (Raekke, naturv. mat. Afd.) 4, 1–231 (1886).
Conover, R. J. and C. M. Lalli: Feeding and growth in Clione limacina (Phipps), a pteropod mollusc. J. exp. mar. Biol. Ecol. 9, 279–302 (1972).
Danforth, C. H.: A new pteropod from New England. Proc. Boston Soc. nat. Hist. 34, 1–19 (1907).
Fretter, V.: The prosobranch veliger. Proc. malac. Soc. Lond. 37, 357–366 (1967).
— and A. Graham: British prosobranch molluscs, 755 pp. London: Ray Society 1962.
Hyman, L. H.: The invertebrates. Vol. VI. Mollusca I, 792 pp. New York: McGraw-Hill 1967.
Knipowitsch, N.: Zur Entwicklungsgeschichte von Clione limacina. Biol. Zbl. 11, 300–303 (1891).
Kwietniewski, C.: Über die Larven eines unbekannten gymnosomen Pteropoden. Zool. Anz. 36, 257–271 (1910).
—: Über die Larve mit Segellappen eines gymnosomen Pteropoden (Thalassopterus zancleus). Zool. Anz. 39, 589–602 (1912).
Lalli, C. M.: Food and feeding of Paedoclione doliiformis Danforth, a neotenous gymnosomatous pteropod. Biol. Bull. mar. biol. Lab., Woods Hole 143, 392–402 (1972).
Lebour, M. V.: Clione limacina in Plymouth waters. J. mar. biol. Ass. U.K. 17, 785–795 (1931).
Morton, J. E.: Observations on the gymnosomatous pteropod Clione limacina (Phipps). J. mar. biol. Ass. U.K. 37, 287–297 (1958).
Pelseneer, P.: Report on the Pteropoda collected by H. M. S. Challenger during the years 1873–76. I. The Gymnosomata. Rep. Challenger Soc. (Zool.) 19, 1–74 (1887).
Pruvot-Fol, A.: Mollusques opisthobranches. Faune Fr. 58, 1–460 (1954).
Sharaf El Din, S. H., E. M. Hassan and R. W. Trites: The physical oceanography of St. Margaret's Bay. Fish. Res. Bd Can., Tech. Rep. 219, 1–242 (1970).
Tesch, J. J.: The Gymnosomata II. Dana Rep. 36, 1–55 (1950).
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Communicated by T. R. Parsons, Vancouver
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Lalli, C.M., Conover, R.J. Reproduction and development of Paedoclione doliiformis, and a comparison with Clione limacina (Opisthobranchia: Gymnosomata). Marine Biology 19, 13–22 (1973). https://doi.org/10.1007/BF00355415
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DOI: https://doi.org/10.1007/BF00355415