Abstract
Additional specimens of three newly described Chilean species of Trophon s.l. Monfort, 1810 have been dredged recently off south-central Chile, and we here list the new data and illustrate the radulae. Another species, Trophon wilhelmensis Ramírez-Bohme, 1981, is combined with Coronium Simone, 1996. Pagodula concepcionensis n. sp. is described and another species remains unidentified. A type species is designated for Pagodula Monterosato, 1884. Part of the new material comes from an area of methane seepage located northwest of the Bay of Concepción, from 726 to 930 m depth. Many drilled valves of two species of chemosymbiotic clams (Calyptogena gallardoi Sellanes & Krylova, 2005 and Thyasira methanophila Oliver & Sellanes, 2005) were also obtained at the seep site. We assume that this holes document attacks of this trophonines to the clams.
References
Amano, K. (2003) Predatory gastropod drill holes in Upper Mioceno cold seep bivalves, Hokkaido, Japan. The Veliger, 46, 90–96.
Bouchet, P. & Warén, A. (1985) Revision of the Northeast Atlantic bathyal and abyssal Neogastropoda excluding Turridae. Bollettino Malacologico, suppl. 1, 123–296.
Carriker, M.R. (1981) Shell penetration and feeding by naticacean and muricacean predatory gastropods: a synthesis. Malacologia, 20, 403–422.
Holmes, A., Oliver, P.G., Sellanes, J. (2005) A new species of Lucinoma (Bivalvia: Lucinoidea) from a methane gas seep off the southwest coast of Chile. Journal of Conchology, 38, 673–682.
Houart, R. (2001) Ingensia gen. nov. and eleven new species of Muricidae (Gastropoda) from New Caledonia, Vanuatu, and Wallis and Futuna Islands. Tropical Deep-Sea Benthos, vol. 22. Mémoires du Muséum national d'Histoire naturelle, 185, 243-269.
Houart, R. (2003) Description of three new species of Trophon s.l. Montfort, 1810 (Gastropoda: Muricidae) from Chile. Novapex, 4, 101–110.
La Perna, R. (1996) Phyletic and ecological implications between Pagodula vaginata (De Cristofori & Jan, 1832) and Pagodula echinata (Kiener, 1840) (Gastropoda, Muricidae). Bollettino della Società Paleontologica Italiana, 35, 81–92.
Levin, L.A. & Michener, R. (2002) Isotopic evidence of chemosynthesis-based nutrition of macrobenthos: the lightness of being at Pacific methane seeps. Limnology and Oceanography, 47, 1336–1345.
McLean, J.H. & Andrade, V. H. (1982) Large archibenthal gastropods of central Chile: collections from an expedition of the R/V Anton Brunn and the Chilean shrimp fishery. Contributions in Science, 342, 1–20.
Merle, D. (1999) La radiation des Muricidae (Gastropoda : Neogastropoda) au Paléogène: approche phylogénétique et évolutive. Thèse de doctorat du Muséum National d’ Histoire Naturelle, Paris, i–vi, 499 pp.
Merle, D. (2001) The spiral cords and the internal denticles of the outer lip in the Muricidae: terminology and methodological comments. Novapex, 2, 69–91.
Montfort, P.D. de (1810) Conchyliologie systématique, et classification méthodique des coquilles. Tome second. Coquilles univalves, non cloisonnées, Schoell, Paris, 676 pp.
Oliver, P.G. & Sellanes, J. (2005) New species of Thyasiridae from a methane seepage area off Concepción, Chile. Zootaxa, 1092, 1–20.
Pastorino, G. (1999) A new species of gastropod of the genus Trophon Montfort, 1810 (Mollusca: Gastropoda: Muricidae) from Subantarctic waters. The Veliger, 42, 169–174.
Pastorino, G. (2005) A revision of the genus Trophon Montfort, 1810 (Gastropoda: Muricidae) from southern South America. The Nautilus, 119, 55–82.
Radwin, G. & D’ Attilio, A. (1975) A catalogue of Muricacean generic taxa. Transactions of the San Diego Society of Natural History, 17, 279–292.
Ramírez-Bohme, J. (1981) Trophon (Enixotrophon) wilhelmensis n.sp. (Mollusca, Gastropoda, Muricidae) Museo Nacional de Historia Natural, Santiago, Chile, Noticiario Mensual, 26 (301–302), 5–6.
Sellanes, J. & Krylova, E. (2005) A new species of Calyptogena (Bivalvia, Vesicomyidae) from a recently discovered methane seepage area off Concepción Bay, Chile (~36ºS). Journal of the Marine Biological Association UK, 85, 969–976.
Sellanes, J., Quiroga, E. & Gallardo, V.A. (2004) First direct evidences of methane seepage and associated chemosynthetic communities in the bathyal zone off Chile. Journal of the Marine Biological Association UK, 84, 1065–1066.
Sibuet, M. & Olu, K. (1998) Biogeography, biodiversity, and fluid dependence of deep-sea cold-seep communities at active and passive margins. Deep-Sea Research II, 45, 517–567.
Sibuet, M. & Olu-LeRoy, K. (2002) Cold seep communities on continental margins: structure and quantitative distribution relative to geological and fluid venting patterns. In Ocean Margin Systems, G. Wefer et al. (eds). Berlin: Springer-Verlag, 235–251.
Simone, L.R.L. (1996) Coronium, a new genus of Muricidae (Mollusca, Neogastropoda) from off the Southeastern coast of Brazil, with description of two new species. Bulletin of Marine Science, 59, 45–52.