Abstract
A pterobranch hemichordate, Cephalodiscus sp., was collected from Bermuda just below the low-tide mark in July 1983 and again in October through December 1983. This is the third report of this genus in shallow water and the second for the Western Hemisphere. Specimens were observed alive in the laboratory. Colonies consist of zooids at various stages of development arranged in clusters inside a translucent, collagenous coenecium. Cilia-driven currents of the zooids are used in a method of filter-feeding similar to phylactolaemate bryozoans.
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Armstrong, W. G., P. N. Dilly and A. Urbanek: Collagen in the pterobranch coenecium and the problem of graptolite affinites. Lethaia 17, 145–152 (1984)
Barnes, R. D.: New record of a pterobranch hemichordate from the Western Hemisphere. Bull. mar. Sci. 27, 340–343 (1977)
Bayer, F. M.: A new species of Cephalodiscus (Hemichordata: Pterobranchia), the first record from the tropical Western Atlantic. Bull. mar. Sci. Gulf Caribb. 12, 306–312 (1962)
Borg, F.: Studies on recent cyclostomatous Bryozoa. Zool. Bidr. Upps. 10, 181–507 (1926)
Bullivant, J. S.: The method of feeding of lophophorates (Bryozoa, Phoronida, Brachiopoda). N. Z. Jl mar. Freshwat. Res. 2, 135–146 (1968)
Dawydoff, C.: Classe des Ptérobranches. In: Traité de zoologie, Vol. II. pp 454–489. Ed. by P. G. Grassé. Paris: Masson et Cie 1948
Gilmour, T. H. J.: Ciliation and function of the food-collecting and waste-rejecting organs of lophophorates. Can. J. Zool. 56, 2142–2155 (1978)
Harmer, S. F.: The Pterobranchia of the Siboga-Expedition with an account on other species. In: Résultats des explorations à bord du Siboga (monographie) 26 bis, pp 1–132. Ed. by M. Weber, Leiden: E. J. Brill 1905
Horst, van der, C. J.: Hemichordata. Bronn's Kl. Ordn. Tierreichs (Abt. 4) 4 (2), 1–737 (1939)
Hyman, L. H.: The invertebrates: smaller coelomate groups, Vol. 5. 783 pp. New York: McGraw-Hill 1959
John, C. C.: Cephalodiscus. ‘Discovery’ Rep. 3, 223–260 (1931)
Johnston, T. H. and N. G. Muirhead. Cephalodiscus. Rep. B.A.N.Z. antarct. Res Exped. (Ser. 1 B) 1, 91–120 (1951)
Markham, J. C.: The species of Cephalodiscus collected during Operation Deep Freeze, 1956–1959. Antarctic Res. Ser. 17, 83–110 (1971)
Ridewood, W. G.: Cephalodiscus. Natn. Antarct. Exped. 1901–1904 (Nat. Hist., 3, Zool. 2) 1–67 (1907)
Ridewood, W. G.: Cephalodiscus. Nat. Hist. Rep. Br. Antarct. Terra Nova Exped. (Zool.) 4, 11–82 (1918)
Ridewood, W. G.: A key for the ready identification of the species of Cephalodiscus. Ann. Mag. nat. Hist. (ser. 9) 5, 407–410 (1920)
Ryland, J. S.: Physiology and ecology of marine bryozoans. Adv. mar. Biol. 14, 285–443 (1976)
Schepotieff, A.: Die Pterobranchier des Indischen Ozeans. Zool. Jb. (Abt. Syst. Ökol. Geogr. Tiere) 28, 429–448 (1909)
Stebbings, A. R. D. and P. N. Dilly: Some observations of living Rhabdopleura compacta (Hemichordata). J. mar. biol. Ass. U.K. 52, 443–448 (1972)
Strathmann, R.: Function of lateral cilia in suspension feeding of lophophorates (Brachiopoda, Phoronida, Ectoprocta). Mar. Biol. 23, 129–136 (1973)
Strathmann, R. R.: Cinefilms of particle capture by an induced local change of beat of lateral cilia of a bryozoan. J. exp. mar. Biol. Ecol. 62, 225–236 (1982)
Winston, J. E.: Polypide morphology and feeding behavior in marine ectoprocts. Bull. mar. Sci. 28, 1–31 (1978)
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Communicated by N. D. Holland, La Jolla
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Lester, S.M. Cephalodiscus sp. (Hemichordata: Pterobranchia): observations of functional morphology, behavior and occurrence in shallow water around Bermuda. Marine Biology 85, 263–268 (1985). https://doi.org/10.1007/BF00393246
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DOI: https://doi.org/10.1007/BF00393246