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</topic><topic id="http://thesaurus.abuledu.org/thesaurus/vocab/?tema=411"><instanceOf><topicRef xlink:href="#term"/></instanceOf><baseName><baseNameString>Chondrichthyes</baseNameString></baseName>  <occurrence>    <instanceOf>      <topicRef xlink:href="#scope-note"/>    </instanceOf><baseName><baseNameString><![CDATA[ <p><img title="&Eacute;lectror&eacute;cepteurs de t&ecirc;te de requin, avec Ampoules de Lorenzini et canaux lat&eacute;raux." src="http://data-cache.abuledu.org/512/electrorecepteurs-d-une-tete-de-requin-52d83be6.jpg" alt="Les requins poss&egrave;dent des organes sensitifs sp&eacute;ciaux appel&eacute;s ampoules de Lorenzini pouvant d&eacute;tecter des champs &eacute;lectromagn&eacute;tiques aussi bien que des gradients de la temp&eacute;rature (ce gradient &eacute;tant la direction o&ugrave; la temp&eacute;rature augmente le plus). Ils fournissent aux requins et aux raies un v&eacute;ritable sixi&egrave;me sens." width="150" height="92" /></p>
<p>Les chondrichthyes poss&egrave;dent un squelette cartilagineux l&eacute;ger (le mot grec ancien <strong>H&oacute;ndros</strong> signifie cartilage) et une peau recouverte d'&eacute;cailles en forme de dents. Chacune de leurs 5 branchies poss&egrave;de une ouverture propre.&nbsp;Ils n'ont pas de vessie natatoire et utilisent l'huile de leur foie pour assurer leur flottabilit&eacute;.</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=411"/>    </member>    <member>      <roleSpec>  <topicRef xlink:href="#broader"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=400"/>    </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=448"/>    </member>    <member>      <roleSpec>  <topicRef xlink:href="#preferred-term"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=411"/>    </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=449"/>    </member>    <member>      <roleSpec>  <topicRef xlink:href="#preferred-term"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=411"/>    </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=450"/>    </member>    <member>      <roleSpec>  <topicRef xlink:href="#preferred-term"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=411"/>    </member>  </association></topicMap>