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      Primer registro en Chile de diciémidos simbiontes en el pulpo pigmeo Robsonella fontaniana (Cephalopoda: Octopodidae) Translated title: First record in Chile of dicyemids in the pygmean octopus Robsonella fontaniana (Cephalopoda: Octopodidae)

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          Translated abstract

          Dicyemids are commensals or parasites which live in the renal organs of benthic cephalopods. This study reports the presence of a dicyemid species in the kidney of the small octopus Robsonella fontaniana collected in the southern Pacific Ocean on the central coast of Chile. Smeared renal tissues on glass slides and histological sections were prepared for microscopical observation. All host octopuses observed (n= 7) had dicyemids in the renal tissues. The dicyemids were Dicyemennea characterized by calottes composed of 4 propolar cells and 5 metapolar cells. This is the first record of dicyemids in Chile and also in R. fontaniana.

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          Biology of dicyemid mesozoans.

          Kazuhiko Tsuneki, Hidetaka Furuya (2003)
          We reviewed recent advances of some aspects on the biology of dicyemid mesozoans. To date 42 species of dicyemids have been found in 19 species of cephalopod molluscs from Japanese waters. The body of dicyemids consists of 10-40 cells and is organized in a very simple fashion. There are three basic types of cell junction, septate junction, adherens junction, and gap junction. The presence of these junctions suggests not only cell-to-cell attachment, but also cell-to-cell communication. In the development of dicyemids, early stages and cell lineages are identical in vermiform embryos of four genera, Conocyema, Dicyema, Microcyema, and Pseudicyema. Species-specific differences appear during later stages of embryogenesis. In the process of postembryonic growth in some species, the shape of the calotte changes from conical to cap-shaped and discoidal. This calotte morphology appears to result from adaptation to the structure of host renal tissues and help to facilitate niche separation of coexisting species. In most dicyemids distinctly small numbers of sperms are produced in a hermaphroditic gonad (infusorigen). The number of eggs and sperms are roughly equal. An inverse proportional relationship exists between the number of infusorigens and that of gametes, suggesting a trade-off between them. Recent phylogenetic studies suggest dicyemids are a member of the Lophotrochozoa.
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            Electron Microscopic Studies on Dicyemid Mesozoa. I. Vermiform Stages

            Robert Ridley (1968)
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              Calotte morphology in the phylum Dicyemida: niche separation and convergence

              Hidetaka Furuya, F. G. Hochberg, Kazuhiko Tsuneki … (2003)
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                Author and article information

                Journal
                Journal ID (publisher-id): revbiolmar
                Title: Revista de biología marina y oceanografía
                Abbreviated Title: Rev. biol. mar. oceanogr.
                Publisher: Universidad de Valparaíso. Facultad de Ciencias del Mar (Valparaíso, , Chile )
                ISSN (Electronic): 0718-1957
                Publication date (Print and electronic): December 2013
                Volume: 48
                Issue: 3
                Pages: 647-651
                Affiliations
                [02] Valparaíso orgnameUniversidad de Valparaíso orgdiv1Facultad de Ciencias Chile
                [01] Viña del Mar orgnameUniversidad de Valparaíso orgdiv1Facultad de Ciencias del Mar y de Recursos Naturales Chile gabriela.munoz@ 123456cienciasdelmar.cl
                Article
                Publisher ID: S0718-19572013000300022 Publisher ID: S0718-1957(13)04800300022
                DOI: 10.4067/S0718-19572013000300022
                SO-VID: 5bb9cf56-572e-4dfe-90e1-70056d81b347
                License:

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                Date received : 17 January 2013
                Date accepted : 02 September 2013
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 22, Pages: 5
                Product

                SciELO Chile

                Categories
                Subject: NOTAS CIENTÍFICAS

                Keywords: Dicyemennea,dicyemids,Cephalopod,mesozoa
                Data availability:
                Keywords: Dicyemennea, dicyemids, Cephalopod, mesozoa

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