ADDENDUM Feeding mechanism in volutids from north Patagonian shallow waters Bigatti, Gregorio 1 ; Sanchez Antelo, Carlos J.M. 2 ; Penchaszadeh, Pablo E. 2 1 Centro Nacional Patagónico CENPAT – CONICET, Bvd. Brown s/n., U9120ACV Puerto Madryn, Chubut, Argentina, Email: gbigatti@cenpat.edu.ar 2 Depto. de Biodiversidad, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina. The volutids Odontocymbiola magellanica (Subfamily Odontocymbiolinae) and Adelomelon ancilla (Subfamily Zidoninae) occur along the South Atlantic coast from 35°S, down to the Magallanes Strait. These neogastropods are sympatric species in north Patagonian gulfs belonging from different subfamilies, have different radula shape and position <strong>of</strong> salivary and accessory salivary glands, but observations done in natural environment revealed that they have a similar feeding mechanism. In a first step <strong>of</strong> capture, both species strongly engulfed the prey with their foot, creating a cavity which is closed but not isolated from the environment. After around 10 hours, prey are narcotized by a white liquid produced in the accessory salivary glands and introduced inside this cavity by the proboscides (pH <strong>of</strong> salivary liquid is around 10). Prey narcotization leads to lower muscle speed reaction, enabling the predator to feed on the prey fresh tissues by means <strong>of</strong> its radula. This organ is very sharp in both species and tears the tissues <strong>of</strong> the living prey, so in the stomachs analyzed only a mucous mass was found. Field observations suggest that narcotization is produced due to the constant release <strong>of</strong> salivary liquid into the cavity generated by the foot, where the prey are immobilized. The analysis <strong>of</strong> prey obtained by SCUBA diving indicated that O.magellanica and A. ancilla are top predators in the benthic community, its diet consisting mainly in gastropods and bivalves. O. magellanica mainly feeds on gastropods (54%) and bivalves (46%). Adelomelon ancilla mainly consumes bivalves (90 % <strong>of</strong> the cases), follow by gastropods and in some isolated cases the sea urchin Arbacia dufresnii (less than 2 % <strong>of</strong> the items). In sandy bottoms, where aggregation <strong>of</strong> O. magellanica occurred but no other mollusks were found, intraspecific cannibalism was registered in 4.7% <strong>of</strong> the cases while A. ancilla did not present cannibalism. 254
AUTHOR INDEX Abbes, I. 1 Abbott, C.A. 123 Abdou, A. 1 Abrahão, J.R. 2 Abraszewska, A. 2 Afonso, C. 43 Ajikobi, D. A. 162 Aktipis, S.W. 3 Alain, D. 148 Albrecht, C. 3, 21, 94, 199, 203, 242 Aldea, C. 4 Aldridge, D.C. 5, 5 Alejandrino, A. 6 Allgaier, C. 6 Alonso, M.R. 43, 112 Altaba, C.R. 7 Amano, K. 7 Amaral, A.C.Z. 2,248 Ambu, S. 36 Amor, M.J. 8, 183 Anderson, F.E. 8,37 Andreikėnaitė, L. 19 Angeletti, L. 219 Angulo, E. 138 Anistratenko, V.V. 203 Anthes, N. 8, 67, 214 Antipushina, Z. 9 Antoine, P. 147 Aparicio, M.T. 25 Apte, D. 9 Araujo, R. 11, 25, 48, 179, 179, 222, 223 Aravind, N.A. 11 Armbruster, G.F.J. 12, 20 Arrébola, J.R. 56, 82 Arrighetti, F. 75, 166 Arrington, T. 12 Arruda, R. 232 Asami, T. 13, 163, 227, 244 Avalos, C. 13 Averbuj, A. 14 Backeljau, T. 26, 27, 40, 50, 50, 56, 107, 107, 128, 133, 165, 172, 230, 231, 237 Bahamondes-Rojas, I. 26 Baker, G.H. 135 Bakhmet, I.N. 15 Baldinger, A.J. 15 Bandel, K. 16 255 Baoanan, Z.G. 16 Barco, A. 160 Barillé, L. 53 Barr, N. 17 Barrias, C. 17 Barry, P. 18 Baršienė, J. 19, 190 Bäumler, N. 19 Baur, B. 20, 199 Beck, F. 122 Beeby, A. 20 Beese, K. 20 Beier, K. 20 Beninger, P.G. 53 Benke, M. 21 Benkendorff, K. 122, 240 Bermúdez-Rochas, D.D. 48 Bervoets, L. 197 Bieler, R. 21, 22, 145, 176 Bigatti, G. 166, 253 Bininda-Emonds, O.R.P. 209 Blaha, L. 142 Blust, R. 230, 231 Bódis, E. 23 Bodon, M. 74 Bogan, A.E. 105 Boisselier, M-C. 31, 133, 174 Bolch, C. 61 Boneka, F. 101 Borrero, F.J. 23 Botana, A.G. 24, 41, 49, 202, 226 Bouchet, P. 1, 24, 174 Bradshaw, C.J.A. 36 Bragado, M.D. 25 Brändle, M. 21 Bretos, M. 26 Breugelmans, K. 26, 54, 128, 165, 237 Briand, V. 155 Brown, K.M. 105 Brückner, M. 122 Buck, K. 102 Budha, P.B. 27 Budzinski, H. 128 Buick, D.P. 27 Burch, J.B. 127 Burghardt, I. 28 Burton-Kelly, M. 28, 92 Bush, S.L. 29
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World Congress of Malacology Antwer
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World Congress of Malacology, Antwe
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WCM 2007 HOSTED V
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Thank you very much for your genero
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FINANCIAL SUPPORT WAS ALSO ENTHOUSI
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ORGANISATION OF CONGRESS ORGANISERS
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THE SCIENCE Contributed paper sessi
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MOLLUSCS IN ECOTOXICOLOGICAL RESEAR
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NEOGASTROPOD ORIGINS, PHYLOGENY, EV
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SCHEDULE AT A GLANCE (some evening
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12:30 - 12:50 A molecular phylogeny
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MONDAY 16 JULY OPEN SESSION: LAND S
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MONDAY 16 JULY MOLLUSCAN MODELS: AD
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MONDAY 16 JULY OPEN SESSION: TERRES
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17:50 - 18:10 Population genetic st
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12:10 - 12:30 Palaeoheterdonta MMVI
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TUESDAY 17 JULY MOLLUSCS AS MODELS
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17:30 - 17:50 Waddington´s widget
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12:30 - 12:50 Application of marine
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TUESDAY 17 JULY MOLLUSCS IN ECOTOXI
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WEDNESDAY 18 JULY All excursions wi
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12:50 - 14:00 Lunch + AMS Conservat
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THURSDAY 19 JULY MOLLUSCS AS MODELS
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17:10 - 17:30 Germany’s next top
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OPEN SESSION: MARINE ECOLOGY Chair:
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OPEN SESSION: FRESHWATER MOLLUSCS C
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12:30 - 12:50 Phylogenetics of the
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12:50 - 14:00 Lunch + AMS Students
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12:10 - 12:30 Comparative anatomy o
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12:30 - 12:50 Threshold dimorphism
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12:50 - 14:00 Lunch + AMS Students
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POSTERS In alphabetical order of th
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Correlates of endemism and biogeogr
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Extreme variability in the radula o
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Development of an initial conservat
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Cell and tissue biology of the muss
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Fresh water mollusks of the Azores:
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Ecological character displacement a
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Preliminary studies on the occurren
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ABSTRACTS Contribution to the revis
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In 2006 I sampled 45 sites in the 1
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share morphological features of the
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Freshwater bivalve biodiversity: ne
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Hidden genetic diversity in cephalo
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How many unionoid taxa live in the
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etween springs, 3) and reduction of
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The effects of salinity changes on
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Conus (cone snails) is an unusually
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Cytogenetic damage in aquatic mollu
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fertilization as the predominant ma
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Spatio-temporal and biomass dynamic
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little attention. Molluscs are bare
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into one taxon, since they form a w
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near-complete outline. A conservati
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Opportunities to acquire important
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The Santa Barbara Museum of Natural
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Unravelling a taxonomic tangle and
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soil type and geological age) for P
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Heterometric autoregulation in the
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Snails from America’s heartland:
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congener R. guerinii Reclùz, 1843.
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Gastropod species as model organism
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snails interact they may, co-operat
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Evolution of spermatophore ornament
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Invasive freshwater species Sinanod
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Can response to water flow explain
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A DNA-based phylogeny resolves dive
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and I. rositai. Besides, their phyl
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The allozyme data showed no sign of
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We have used mitochondrial COI DNA
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phylogenetic status of the Sicilian
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asal origin of species from Sulawes
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Interference competition in the sus
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New species of proneomenidae (Mollu
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Reconstruction of the pleniglacial
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can lead to erroneous beta taxonomy
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glandular ventral organs that have
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species in a parsimony analysis of
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awaiting description. The bulk of t
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morphological variants of the shall
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authors disagree about the classifi
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Also, biomass of the seagrass (leav
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Pupillidae (Pupilla triplicata); Ve
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distant populations of the same mor
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Bahamian Islands were submerged as
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their habitats and diverse anatomic
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examine genetic variation within an
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New techniques yield new insights o
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Motivation to resist sex in a simul
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Interstate Park and Franconia, MN,
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in Utah (e.g. Oxychilus alliarius,
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A recent review of the biogeography
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Associations between shell strength
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independently, some successfully in
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accessible tidal flats. This assemb
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adapted retinal mRNA showed 1.4- an
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The value of analyzing Pisidium fau
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lacking. Accordingly, one of the ob
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DNA studies using both nuclear (ITS
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Fasciolariidae due to the peculiar
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depth) near Chatham Rise, New Zeala
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could potentially represent a senti
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A remarkable new genus of sessile,
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mussels showed elevated levels for
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genetic data. The resulting diversi
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different compartments were analyze
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Pest snails in Australia: current m
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Multivariate statistical analysis o
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mixtures of pollutants. Moreover, a
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subspecies: T. s. melitense. T. fer
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teams in Japan and Russia within th
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Sexual conflict and conflict resolu
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demonstrated to be a different stru
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minimal or no branching are more pr
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The evolution of eyes in the Bivalv
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Malacology in the arid areas of the
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The allocation of energy for reprod
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last 25 years i.e., since SEMs have
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fragment of about 2200 bp of the mi
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Spermatozoan morphologies of some s
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CENSOR “Climate variability and E
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on the same plane as the aperture,
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Amino acids in calcite: a tiny time
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GST/S-crystallins are enzymatically
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Updating the knowledge about the fa
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In this contribution, we present ou
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The limited number of taxa sampled
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fine taxonomic level. We have now i
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econstructions based on two differe
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Assessing effects of heavy-metal po
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In a rather conservative approach 1
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work consisted on the installation,
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structures are needed that allow ma
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elation with environmental variable
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values of micronuclei’s in Baltic
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Freshwater snail diversity of Grand
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keys for micromollusc samples: The
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7. Institute of Biology, Leiden Uni
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Challenging the biogeographical sce
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preserved material is rare for thes
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