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      Alteraciones histopatológicas de la gónada de Tegula euryomphala (Gastropoda: Trochidae) parasitada por un Opecoelidae (Digenea) Translated title: Histopathological alterations of the gonad of Tegula euryomphala (Gastropoda: Trochidae) parasitized by an Opecoelidae (Digenea)

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          Abstract

          Al estudiar ejemplares del caracol Tegula euryomphala recolectados en la Bahía La Herradura, Coquimbo, Chile, observamos una coloración atípica en las gónadas asociada con la presencia de larvas de helmintos parásitos. Para evaluar las alteraciones histopatológicas que sufre la gónada del molusco debido a los parásitos, procesamos tejidos de T. euryomphala no parasitados y parasitados mediante la técnica histológica tradicional. Determinamos la presencia de formas larvarias de tremátodos de la familia Opecoelidae. Las alteraciones histológicas producidas por los esporocistos de estos tremátodos sobre la gónada del hospedero son extremas, solo la cápsula externa de la gónada mantiene su estructura normal. Los esporocistos sustituyen total o parcialmente la zona trabecular. La cápsula interna se observa desorganizada y se interrumpe en secciones, lo que permite la invasión de los parásitos a la glándula digestiva. En ejemplares parcialmente castrados las trabéculas gonadales se comprimen hacia la periferia de la gónada. Además, se observó desorganización de espermatogonias y espermatocitos, y escasez de ovocitos maduros en los moluscos parasitados. Las observaciones sugieren que las alteraciones histológicas en las gónadas de T. euryomphala serían el resultado de factores mecánicos mediados por los estadios larvarios del tremátodo.

          Translated abstract

          Trematodes can alter the population structure of gastropods by castration. An unusual color in the gonads of the gastropod Tegula euryomphala, associated with larvae of parasitic helminths, was detected in specimens collected from La Herradura Bay, Coquimbo, Chile. To evaluate the histopathological alteration of the gonad due to parasites we processed tissue of non-parasitized specimens and parasitized specimens of T. euryomphala by means of standard histological techniques. It was determined that the histological alteration produced by the sporocysts of the trematodes on the gonad is extreme and only the outer capsule keeps its normal structure. The trabecular zone is partially or completely replaced by sporocysts of trematodes. The internal capsule is disrupted and interrupted into sections, allowing the invasion of parasites in the digestive gland. In specimens castrated partially we recorded compression of the gonadal trabeculae towards the periphery of the gonad. Also we determined spermatogonia and spermatocytes disorganization and lack of mature oocytes in the parasitized individuals. Observations suggest that the histological alterations in gonads castrated of T. euryomphala are the result of mechanical factors mediated by the larval stages of the trematode parasite belonging to the family Opecoelidae.

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          REPRODUCTIVE and LARVAL ECOLOGY OF MARINE BOTTOM INVERTEBRATES

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            Reproductive and larval ecology of marine bottom invertebrates.

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              Parasitism, community structure and biodiversity in intertidal ecosystems

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                Author and article information

                Journal
                hbio
                Hidrobiológica
                Hidrobiológica
                UAM, Unidad Iztapalapa (México, DF, Mexico )
                0188-8897
                April 2015
                : 25
                : 1
                : 31-38
                Affiliations
                [01] Santiago de Chile orgnameUniversidad Católica del Norte orgdiv1Departamento de Biología Marina Chile rrz002@ 123456ucn.cl
                Article
                S0188-88972015000100004 S0188-8897(15)02500100004
                75710959-b1b0-4f82-b42c-44bd53c4d6da

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

                History
                : 01 September 2014
                : 06 June 2013
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 46, Pages: 8
                Product

                SciELO Mexico

                Categories
                Artículos

                histopatología,Opecoelidae,Tegula euryomphala,Gonad,histopathology,parasitic castration,Castración parasítica,gónada

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