Abstract
Southeastern Pacific sponges (Phylum Porifera) range among the world’s least known faunas, with only 13 species reported to date from the entire Peruvian coast. This state of affairs motivated the onset of two large, cooperative, exploratory initiatives, with the aim of mapping sponge richness and distribution in the area: Proyectos ESPER and EsponjAS. Over 800 specimens have been collected in Peru since 2007, with identifications still in progress. Among these, a sponge species originally thought to be an exclusive epibiont on Eucidaris thouarsii sea urchins, relatively conspicuous on Peru’s Punta Sal region. This sponge, latter found to occur on additional substrates too, is described as a new species of Clathria (Microciona). Cidarid density ranged between 1.5 and 12/m 2 , and largest diameter of the tests between 3.2 and 5.6 cm. Total number of spines on each sea urchin varied between 68 and 96, and percent sponge coverage of these, between 18.2 and 75.7. There appears to be only a slight tendency for increased sponge coverage on larger sea urchins, so there may be factors, other than sea urchin age, shaping this association. Clathria (Microciona) aculeofila sp. nov. can be markedly dominant as an epibiont on E. thouarsii, albeit the great sponge richness in the area. This is in contrast to the allegedly opportunistic, diverse epibiosis by sponges reported previously for Antarctic cidaroids.References
Agassiz, A. (1898) Reports on the dredging operations off the west coast of Central America to the Galapagos, to the West coast of Mexico, and in the Gulf of California, in charge of Alexander Agassiz, carried on by the U.S. Fish Commission Steamer "Albatros", during 1891, Lieut. Commander Z.L. Tanner, U.S.N., commanding. Bulletin of the Museum of Comparative Zoology at Harvard College, 33, 71–86, pls I–XIII, 71 map.
Azevedo, F., Hajdu, E., Willenz, Ph. & Klautau, M. (2009) New records of Calcareous sponges (Porifera, Calcarea) from the Chilean coast. Zootaxa, 2072, 1–30.
Carter, H.J. (1885) Descriptions of Sponges from the Neighbourhood of Port Phillip Heads, South Australia. Annals and Magazine of Natural History (5), 16, 277–294.
Caso, M.E. (1979) Los Equinodermos de la Bahia de Mazatlán, Sinaloa.
Cerrano, C., Bertolino, M., Valisano, L., Bavestrello, G. & Calcinai, B. (2009) Epibiotic demosponges on the Antarctic scallop Adamussium colbecki (Smith, 1902) and the cidaroid urchins Ctenocidaris perrieri Koehler, 1912 in the nearshore habitats of the Victoria Land, Ross Sea, Antarctica. Polar Biology, 32, 1067–1076.
Clark, H.L. (1948) A report of the echini of the warmer eastern Pacific, based on the collections of the Velero III. Allan Hancock Pacific Expedition, 8, 225–252.
David, B., Stock, S.R., Carlo, F., Hétérier, V. & De Ridder, C. (2009) Microstructures of Antarctic cidaroid spines: diversity of shapes and ectosymbiont attachments. Marine Biology, 156, 1559–1572.
Desqueyroux, R.P. (1972) Demospongiae (Porifera) de la costa de Chile. Gayana, 20, 1–71.
Desqueyroux-Faúndez, R. & van Soest, R.W.M. (1996) A review of Iophonidae, Myxillidae and Tedaniidae occurring in the South East Pacific (Porifera: Poecilosclerida). Revue Suisse de Zoologie, 103, 3–79.
Duchassaing de Fonbressin, P. & Michelotti, G. (1864) Spongiaires de la mer Caraïbe. Natuurkundige verhandelingen van de Hollandsche maatschappij der wetenschappen te Haarlem, 21, 1–124, pls I–XXV.
Hajdu, E. & Desqueyroux-Faúndez, R. (2008) A reassessment of the phylogeny and biogeography of Rhabderemia Topsent, 1890 (Rhabderemiidae, Poecilosclerida, Demospongiae). Revue Suisse de Zoologie, 115, 377–395.
Hajdu, E., Desqueyroux-Faúndez, R. & Willenz, Ph. (2006) Clathria (Cornulotrocha) rosetafiordica sp. nov. from a south-east Pacific fjord (Chilean Patagonia) (Microcionidae: Poecilosclerida: Demospongiae: Porifera). Journal of the Marine Biological Association of the United Kingdom, 86, 957–961.
Hallmann, E.F. (1920) New genera of Monaxonid sponges related to the genus Clathria. Proceedings of the Linnean Society of New South Wales, 44, 767–792, pls XXXVI–XL.
Hétérier, V., David, B., De Ridder, C. & Rigaud, T. (2008) Ectosymbiosis is a critical factor in the local benthic biodiversity of the Antarctic deep sea. Marine Ecology Progress Series, 364, 67–76.
Hétérier, V. & De Ridder, C. (2004) Comparative biodiversity of ectosymbionts in two Antarctic cidaroid echinoids, Ctenocidaris spinosa and Rhynchocidaris triplopora. In: T. Heinzeller & J.H. Nebelsick (Eds), Echinoderms München. Taylor & Francis, London, 201–205.
Hooper, J.N.A. (1996) Revision of Microcionidae (Porifera: Poecilosclerida: Demospongiae), with description of Australian species. Memoirs of the Queensland Museum, 40, 1–626.
Hyatt, A. (1877) Revision of the North American Poriferae; with remarks upon foreign species. Part II. Memoirs of the Boston Society of Natural History, 2, 481–554, pls XV–XVII.
Koehler, R. (1912) Echinodermes (astéries, ophiures et échinides). In: Deuxieme Expédition Antarctique Française 1908–1910. Masson, Paris, pp. 272, 216 pls.
Koehler, R. (1926) Description d'un Psammechinus liliaris anormal et fortement déform, provenant de Luc-sur-Mer. Bulletin de l'Institut Océanographique (Monaco), 472, 1–10.
Laubenfels, M.W. de (1932) The marine and fresh-water sponges of California. Proceedings of the United States National Museum, 81, 1–140.
Lendenfeld, R. von (1915) The Sponges. 3. Hexactinellida. In: Reports on the Scientific Results of the Expedition to the Eastern Tropical Pacific, in charge of Alexander Agassiz, by the U.S. Fish Commission Steamer 'Albatross', from October, 1904, to March, 1905, Lieut. Commander L.M. Garrett, U.S.N., Commanding, and of other Expeditions of the 'Albatross', 1891–1899. (29). Memoirs of the Museum of Comparative Zoology at Harvard College, 42, 1–396, pls 391–109.
Lessios, H.A. (2005) Echinoids of the Pacific waters of Panama: Status of knowledge and new records. Revista de Biologia Tropical, 53, 147–170.
Mortensen, T. (1909) Echinological notes. Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening, 65, 211–251.
Mortensen, T. (1910) The Echinoidea of the Swedish South Polar Expedition. Wissenscaftliche Ergebnisse der Schwedischen Südpolar-Expedition 1901–1903 (Vol. 6). Stockholm.
Mothes-de-Moraes, B. (1985) Esponjas Marinhas. In: Manual de Técnicas para Preparação de Coleções Zoológicas. Sociedade Brasileira de Zoologia, São Paulo, pp. 1–3.
Pinheiro, U.S. & Hajdu, E. (2001) Shallow-water Aplysina Nardo (Aplysinidae, Verongida, Demospongiae) from the São Sebastião Channel and its environs (Tropical southwestern Atlantic), with the description of a new species and a literature review of other Brazilian records of the genus. Revista Brasileira de Zoologica, 18, 143–160.
Rützler, K. (1978) Sponges in coral reefs. In: D.R. Stoddart & R E. Johannes (Eds), Research methods. Monographs on oceanographic methodology. UNESCO. Coral Reefs, pp. 5, 299–313.
Schmidt, O. (1862) Die Spongien des adriatischen Meeres. Leipzig: Wilhelm Engelmann.
Schneider, C.L. (2003) Hitchhiking on Pennsylvanian echinoids: Epibionts on Archaeocidaris. Palaios, 18, 435–444.
Soest, R.W.M. van, Hooper, J.N.A. & Hiemstra, F. (1991) Taxonomy, phylogeny and biogeography of the marine sponge genus Acarnus (Porifera: Poecilosclerida). Beaufortia, 42, 49–88.
Thiele, J. (1905) Die Kiesel- und Hornschwämme der Sammlung Plate. Supplement 6 (Fauna Chiliensis III). Zoologische Jahrbücher, 1905, 407–496, pls 427–433.
Topsent, E. (1913) Spongiaires de l'Expédition Antarctique Nationale Ecossaise. Transactions of the Royal Society of Edinburgh, 49, 579– 643, pls I–VI.
Valenciennes, A. (1846) In: Agassiz, L. & Desor, E. (1846) Catalogue raisonn des familles des genres et des espèces de la Classe de Echinodermes. Annales des Sciences Naturelles, Zoologie, 36, 305–374.
Willenz, Ph., Hajdu, E., Desqueyroux-Faúndez, R., Lôbo-Hajdu, G. & M. Carvalho, M. (2009) Porifera - Sponges. In: V. Häussermann & G. Förstera (Eds), Marine Benthic Fauna of Chilean Patagonia. Nature in Focus, Santiago de Chile, pp. 93–170.