Abstract
The umagillid Syndesmis patagonica n. sp. is described from the intestinal tract of the sea urchin Arbacia dufresnii, which represents a new host record for the genus. The hosts were collected from the coast of Patagonia (Argentina), and S. patagonica n. sp. is the first species of Syndesmis reported from South America. Syndesmis patagonica n. sp. can be distinguished from all other species in the genus by the possession of a stylet that is extremely short (less than 50 µm long), and a combination of other characters including the position of the testes, body size, body color and host. An updated overview of the distribution of all species of Syndesmis is also presented.References
Beltagi, S. & Mandura, A.S. (1991) Syndesmis obhoriensis new species – an endoparasite turbellarian (Rhabdocoela: Umagillidae) of the sea-urchin Echinothrix diadema in the Red Sea (Jeddah). Journal of King Abdulaziz University, 4, 43–55.
Cannon, L.R.G. (1982) Endosymbiotic umagillids (Turbellaria) from holothurians of the Great Barrier Reef. Zoologica Scripta, 11, 173–188.
Cannon, L.R.G. (1987) Two new rhabdocoel turbellarians, Umagilla pacifica sp.n. and U. karlingi sp.n. (Umagillidae), endosymbiotic with holothurians (Echinodermata) from the Great Barrier Reef; and a discussion of sclerotic structures in the female system of the Umagillidae. Zoologica Scripta, 16, 297–303.
Doignon, G. & Artois, T. (2006) Annotated checklist of the umagillid turbellarians infesting echinoids (Echinodermata). Belgian Journal of Zoology, 136, 101–106.
François, P. (1886) Sur le Syndesmis, nouveau type de Turbellariés décrit par, M. W.A. Silliman. Comptes Rendus de l'Académie des Sciences, 103, 752–754.
Hertel, L.A. & Duszynski, D.W. (1991) Syndisyrinx evelinae (Marcus, 1968) n. comb., from the rock-boring urchin, Echinometra lucunter, from St. Barthélemy. Journal of Parasitology, 77, 638–639.
Hertel, L.A., Duszynski, D.W. & Ubelaker, J.E. (1990) Turbellarians (Umagillidae) from Caribbean urchins with a description of Syndisyrinx collongistyla n. sp. Transactions of the American Microscopical Society, 109, 273–281.
Hickman, V.V. (1956) Parasitic Turbellaria from Tasmanian Echinoidea. Papers and Proceedings of the Royal Society of Tasmania, 90, 169–181.
Hyman, L.H. (1955) The Invertebrates: Echinodermata. The coelomate Bilateria. Vol. IV. McGraw-Hill Book Company, New York, 763 pp.
Hyman, L.H. (1960) New and know umagillid rhabdocoels from echinoderms. American Museum Novitates, 1984, 1–14.
Jangoux, M. (1990) Diseases of Echinodermata. In. Kinne, O. (Ed.), Diseases of Marine Animals. Biologischen Anstalt Helgoland, Hamburg, pp. 439–567.
Jennings, J.B. (1997) Nutritional and respiratory pathways to parasitism exemplified in the Turbellaria. International Journal for Parasitology, 27, 679–691.
Jennings, J.B. & Mettrick, D.F. (1968) Observations on the ecology, morphology and nutrition of the rhabdocoel turbellarian Syndesmis franciscana (Lehman, 1946) in Jamaica. Caribbean Journal of Science, 8, 57–69.
Jondelius, U. (1996) Three echinoderm inhabiting flatworms (Platyhelminthes, Rhabdocoela) from Western Australia. Belgian Journal of Zoology, 126, 37–48.
Komschlies, K.L. & Vande Vusse, F.J. (1980a) Syndesmis compacta sp. nov. and redescription of S. glandulosa Hyman, 1960 (Turbellaria: Umagillidae) from Philippine sea urchins. Journal of Parasitology, 66, 664–666.
Komschlies, K.L. & Vande Vusse, F.J. (1980b) Three new species of Syndesmis Silliman, 1881 (Turbellaria: Umagillidae) from Philippine sea urchins. Journal of Parasitology, 66, 659–663.
Kozloff, E.N. (1997) Syndesmis echiniacuti sp. nov. (Turbellaria: Neorhabdocoela: Umagillidae) from the Mediterranean sea urchin Echinus acutus. Cahiers de Biologie Marine, 38, 97–102.
Kozloff, E.N. & Westervelt, C.A. (1987) Redescription of Syndesmis echinorum Francois, 1886 (Turbellaria: Neorhabdocoela: Umagillidae), with comments on distinctions between Syndesmis and Syndisyrinx. Journal of Parasitology, 73, 184–193.
Kozloff, E.N. & Westervelt, C.A. (1990) Syndesmis rubida sp. nov. and S. albida sp. nov. (Turbellaria: Neorhabdocoela: Umagillidae) from the sea urchin Echinus esculentus. Cahiers de Biologie Marine, 31, 323–332.
Lehman, H.E. (1946) A histological study of Syndisyrinx franciscanus gen. et sp. nov., an endoparasitic rhabdocoel of the sea urchin, Strongylocentrotus franciscanus. The Biological Bulletin, 91, 295–311.
Marcus, E. (1949) Turbellaria Brasileiros (7). Boletins da Facultade de Filosofia, Ciencias e Letras. Universidade de S. Paulo. Zoología, 14, 7–156.
Marcus, E. (1968) A new Syndesmis from Saint-Barthélemy, Lesser Antilles. Studies of the Fauna of Curacao and other Caribbean Islands, 102, 134–139.
Meixner, J. (1926) Beitrag zur Morphologie und zum System der Turbellaria-Rhabdocoela: II. Über Typhlorhynchus nanus Laidlaw und die parasitischen Rhabdocölen nebst Nachträgen zu den Calyptorhynchia. Zeitschrift Morphology & Okology der Tiere devient Zoomorphology, 5, 527–624.
Moens, J.B., Martens, E.E. & Schockaert, E.R. (1994) Syndesmis longicanalis sp. nov. An umagillid turbellarian (Plathelminthes) from echinoids from the Kenyan coast. Belgian Journal of Zoology, 124, 105–114.
Shinn, G.L. (1981) The diet of three species of umagillid neorhabdocoel turbellarians inhabiting the intestine of echinoids. Hydrobiologia, 84, 155–162.
Smith, N.S. (1973) A new description of Syndesmis dendrastorum (Platyhelminthes, Turbellaria), an intestinal rhabdocoel inhabiting the sand dollar Dendraster excentricus. The Biological Bulletin, 145, 598–606.
Snyder, R.D. (1980) Commensal turbellarians from Bermuda holothurians. Canadian Journal of Zoology, 58, 1741–1744.
Stunkard, H.W. & Corliss, J.O. (1951) New species of Syndesmis and a revision of the family Umagillidae Wahl, 1910 (Turbellaria: Rhabdocoela). The Biological Bulletin, 101, 319–334.
Tyler, S., Schilling, S., Hooge, M. & Bush, L.F. (comp.). (2006–2009) Turbellarian taxonomic database. Version 1.5. Available from http://turbellaria.umaine.edu (accessed 4 December 2009).
Westblad, E. (1953) New Turbellaria parasites in Echinoderms. Arkiv for Zoologi, 5, 269–288.
Westervelt, C.A. & Kozloff, E.N. (1990) Syndesmis aethopharynx sp. nov. (Turbellaria: Neorhabdocoela: Umagillidae), from the sea urchin Paracentrotus lividus, with notes on a probable third species from this host. Cahiers de Biologie Marine, 31, 431–437.
Westervelt, C.A. & Kozloff, E.N. (1992) Two new species of Syndesmis (Turbellaria: Neorhabdocoela: Umagillidae) from the sea urchins Strongylocentrotus droebachensis and Allocentrotus fragilis. Cahiers de Biologie Marine, 33, 115–124.