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Isidascus bassindalei gen.nov., sp.nov. (Ascothoracida: Crustacea) from north-east Atlantic with a note on the origin of barnacles

  • John Moyse (a1)


A new ascothoracid, Isidascus bassindalei gen.nov., sp.nov., has been discovered in the north-east Atlantic Ocean at a depth of over 2000 m. It forms permanent galls on the branches of Acanella arbuscula, a gorgonian of the Family Isidae (Octocorallia, Coelenterata). The new genus is related to Gorgonolaureus, species of which form galls on paramuriceid gorgonians. The gall of the present form unlike that of Gorgonolaureus incorporates a cup of host calcite. Twenty-three adult female specimens and one male were examined in this study. The adult parasite is characterized by elevated humps in a median dorsal position on each of thoracomeres 2,3 and 4. A further feature is a tapering filamentary appendage arising near the base of first thoracopod. The parasite apparently feeds on its host's coenosarc. The likely function of the first and second antennae and each of the three pairs of stylet-form mouth parts is suggested. A case is made for interpretting the species as a protandrous sequential hermaphrodite. Whilst still immature, protanders apparently seek out and settle alongside an adult female. Later, following growth and sexual maturation they again become mobile and after copulation with the nearby female depart to prepare for sex change on a separate branch of the host.



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BRATTSTRÖM, H. 1948. Undersökningar över Oresund 33. On the larval development of the ascothoracid Ulophysema öresundense Brattström. Studies on Ulophysema öresundense, No.2. Lunds universitets årsskrift (N. F. Avd. 2), 44 (5), 68 pp.

Broch, H. 1929. Baccalaureus japonicus ein neuer Cirriped aus der Unterordnung der Ascothoracica. Mitteilungen aus dent Zoologischen Museum in Berlin, 15, 238244.

Broch, H. 1959. Cirripedia, Thoracica, Family: Lepadidae. Fichesd d'identification du zooplarcton, sheet 83, 4 pp.

Dahl, E. 1956. Some crustacean relationships. In Bertil Hanström, Zoological Papers in Horour of his 65th Birthday (ed. K. G. Wingstrand,) pp. 138147. Lund University Press.

Dahl, E. 1963. Main evolutionary lines among recent Crustacea. In Phytogeny and Evolution of Crustacea, pp. 115. Cambridge, Mass.: Museum of Comparative Zoology, Harvard. [Special publication.]

Darwin, C. 1851. A Monograph on the Subclass Cirripedia with Figures of all the Species. The Lepadidae; or Pedunculated Cirripedes. 400 pp. London: Ray Society.

Gruvel, A. 1905. Monographic des Cirrhipédes ou Thecostraces. 472pp. Paris: Masson et Cie. [Reprinted 1965, Amsterdam: A. Asher & Co.]

Grygier, M. J. 1981a. Sperm of the ascothoracican parasite Dendrogasier, the most primitive found in Crustacea. International Journal of Invertebrate Reproduction, 3, 6573.

Grygier, M. J. 1981b. Gorgoniscus incisodactylus, a new isopod of the epicaridean superfamily Cryptoniscoidea, parasitic on an ascothoracican cirripede from Hawaii. Proceedings of the Biological Society of Washington, 94, 122134.

Grygier, M. J. 1981c. Petrarca okadi, a new crustacean (Maxillipoda: Ascothoracica) from the Great Barrier Reef, the first shallow-water record of the genus. Journal of Crustacean Biology, 1, 183189.

Grygier, M. J. 1981d. Gorgonolaureus muzikae sp.nov. (Crustacea: Ascothoracida) parasitic on a Hawaiian gorgonian, with special reference to its protandric hermaphroditism. Journal of Natural History, 15, 10191045.

Grygier, M. J. 1982a. Redescription of Gorgonolaureus bikiniensis (Crustacea: Ascothoracica) with a re-evaluation of its familial affinities. Micronesica, 17 (1–2), 6776.

Grygier, M. J. 1982b. Sperm morphology in Ascothoracida (Crustacea: Maxillopoda): confirmation of generalized nature and phylogenetic importance. International Journal of Invertebrate Reproduction, 4, 323332.

Hickman, J. L. 1959. Dendrogaster tasmarniensis sp.nov. (Ascothoracida) from the sea-star Allostichaster polyplax (Müller and Troschel). Parasitology, 49, 316329.

Kruger, P. 1940. Ascothoracida. In Bronn's Klassen und Ordnungen des Tierreichs, vol. 5, Abteilung 1, Buch 3, Teil 4, pp. 146. Leipzig: Akademische Verlagsgesellschaft m.b.H.

Lacaze-Duthiers, H. de, 1880. Histoire de la Laura gerardiae type nouveau de crustacé parasite. Archives de zoologie expérimental et générale, 8, 537581.

Melander, Y. 1950. Studies on chromosomes of Ulophysema öresundense. Hereditas, 36, 233255.

Newman, W. A. 1974. Two new deep-sea Cirripedia (Ascothoracica and Acrothoracïca) from the Atlantic. Journal of the Marine Biological Association of the United Kingdom, 54, 437‐456.

Newman, W. A.Zullo, V. A. & Withers, T. H. 1969. Cirripedia. In Treatise on Invertebrate Palaeontology, vol. 1, Part R, Arthropoda 4 (ed. R. C. Moore,) pp. 206295. Kansas: Geo-logical Society of America.

Norman, A. M. 1888. On the zoological station at Naples. II. Report on the occupation of the table. Report of the British Association for the Advancement of Science, 1887, 8586.

Norman, A. M. 1913. Synagoga mira, a crustacean of the order Ascothoracica. Transactions of the Linnean Society of London (Zoology), 11, 161166.

Okada, Y. K. 1938. Les cirripèdes ascothoraciques. Travaux de la Station zoologique de Wimereux, 13 489512.

Pyefinch, K. A. 1936. The internal anatomy of Baccalaureus with a description of a new species. Quarterly Journal of Microscopical Science, 78, 653686.

Utinomi, H. 1962. Gorgonolaureus, a new genus of ascothoracid barnacle endoparasitic in Octocorallia. Proceedings of the United States National Museum, 113 (3463), 457464.

Voigt, Von Ehrhard 1959. Endosacculus moltkiae n.g., n.sp., ein Vermutlicher fossiler Ascothoracide (Entomostr.) als Cystenbildner bei der Oktokoralle Moltkia minuta. Paläontologische Zeitschrift, 33 (4), 211223.

Wagin, W. L. 1946. Ascothorax ophioctenis and the position of Ascothoracida Wagin in the system of the Entomostraca. Acta zoologica, 27, 155267.

Wagin, W. L. 1964. (On Parascothorax synagogoides gen.n., sp.n., parasitic on Ophiura quadrispina Clark and some remarks on geographical distribution of the Ascothoracida (Entomostraca).) Trudý Instituta okeanologii. Akademiya Nauk SSSR, 69, 271–84. [In Russian with English summary.]

Wagin, W. L. 1968. (Ascothorax gigas n.sp. from the antarctic ophiuran Ophionotus victoriae Bell and information concerning the distribution of the genus Ascothorax.) Sbornik kratkikh soobschenii kazanskogo gosudarstvennogo Universiteta (Zoologiya), 2, 1023. [In Russian.]

Yanagimachi, R. & Fujimaki, N. 1967. Studies on the sexual organization of the Rhizocephala. IV. On the nature of the testis of Thompsonia. Annotationes zoologicae japonenses, 49, 98104.

Zullo, V. A. 1982. Cirripedia. In Synopsis and Classification of Living Organisms, vol. 1 (ed. S. P. Parker,) pp. 220232. New York: McGraw-Hill.

Isidascus bassindalei gen.nov., sp.nov. (Ascothoracida: Crustacea) from north-east Atlantic with a note on the origin of barnacles

  • John Moyse (a1)


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