title: Occurrence of a specific dual symbiosis in the excretory organ of geographically distant Nautiloids populations.
abstract: Nautilus is one of the most intriguing of all sea creatures, sharing morphological similarities with the extinct forms of coiled cephalopods that evolved since the Cambrian (542-488 mya). Further, bacterial symbioses found in their excretory organ are of particular interest as they provide a great opportunity to investigate the influence of host-microbe interactions upon the origin and evolution of an innovative nitrogen excretory system. To establish the potential of Nautilus excretory organ as a new symbiotic system, it is, however, necessary to assess the specificity of this symbiosis and whether it is consistent within the different species of present-day Nautiloids. By addressing the phylogeny and distribution of bacterial symbionts in three Nautilus populations separated by more than 6000 km (N. pompilius from Philippines and Vanuatu, and N. macromphalus from New Caledonia), this study confirms the specificity of this dual symbiosis involving the presence of betaproteobacteria and spirochaete symbionts on a very wide geographical area. Overall, this work sheds further light on Nautiloids excretory organ as an innovative system of interaction between bacteria and cephalopods.
authors.affiliation: Coral Reef Ecosystem Laboratory, School of Biological Sciences, The University of Queensland, Gehrmann building (#60), Level 7, St Lucia, Queensland 4072, Australia UMR 7208 'Biologie des ORganismes et Ecosytèmes Aquatiques' MNHN-CNRS-IRD-UPMC - Case postale 53, 75231 Paris cedex 05, France Laboratory for Biological Geochemistry, School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
authors.forename: Mathieu
authors.initials: M
authors.lastname: Pernice
authors.forename: Renata
authors.initials: R
authors.lastname: Boucher-Rodoni