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<p>Les <strong>Gast&eacute;ropodes</strong> ou Gasteropoda sont les mollusques caract&eacute;ris&eacute;s par la torsion de leur masse visc&eacute;rale. Leur coquille dorsale (quand elle existe) est torsad&eacute;e et univalve. Il y a des esp&egrave;ces marines, d'eau douce ou terrestres.</p> ]]></baseNameString></baseName>  </occurrence></topic>  <association>    <instanceOf>      <topicRef xlink:href="#broader-narrower"/>    </instanceOf>    <member>      <roleSpec>  <topicRef xlink:href="#narrower"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=410"/>    </member>    <member>      <roleSpec>  <topicRef xlink:href="#broader"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=398"/>    </member>  </association>  <association>    <instanceOf>      <topicRef xlink:href="#synonym"/>    </instanceOf>    <member>      <roleSpec>  <topicRef xlink:href="#non-preferred-term"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=443"/>    </member>    <member>      <roleSpec>  <topicRef xlink:href="#preferred-term"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=410"/>    </member>  </association>  <association>    <instanceOf>      <topicRef xlink:href="#synonym"/>    </instanceOf>    <member>      <roleSpec>  <topicRef xlink:href="#non-preferred-term"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=444"/>    </member>    <member>      <roleSpec>  <topicRef xlink:href="#preferred-term"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=410"/>    </member>  </association></topicMap>