You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allimages aicontinue="20150901053010|Trinovantedinium_xylochoporum.jpg" />
  </query-continue>
  <query>
    <allimages>
      <img name="Pseudoceratium_iehiense.jpg" timestamp="2015-09-01T05:30:11Z" user="Maintenance script" url="http://dinoflaj.smu.ca/dinoflaj2/images/1/14/Pseudoceratium_iehiense.jpg" descriptionurl="http://dinoflaj.smu.ca/wiki/File:Pseudoceratium_iehiense.jpg" ns="6" title="File:Pseudoceratium iehiense.jpg" />
      <img name="Pror225.gif" timestamp="2015-09-01T05:30:11Z" user="Maintenance script" url="http://dinoflaj.smu.ca/dinoflaj2/images/1/1f/Pror225.gif" descriptionurl="http://dinoflaj.smu.ca/wiki/File:Pror225.gif" ns="6" title="File:Pror225.gif" />
      <img name="Kleithriasphaeridium.jpg" timestamp="2015-09-01T05:30:11Z" user="Maintenance script" url="http://dinoflaj.smu.ca/dinoflaj2/images/1/10/Kleithriasphaeridium.jpg" descriptionurl="http://dinoflaj.smu.ca/wiki/File:Kleithriasphaeridium.jpg" ns="6" title="File:Kleithriasphaeridium.jpg" />
      <img name="Hystrichostrogylon_membraniphorum.jpg" timestamp="2015-09-01T05:30:11Z" user="Maintenance script" url="http://dinoflaj.smu.ca/dinoflaj2/images/1/1f/Hystrichostrogylon_membraniphorum.jpg" descriptionurl="http://dinoflaj.smu.ca/wiki/File:Hystrichostrogylon_membraniphorum.jpg" ns="6" title="File:Hystrichostrogylon membraniphorum.jpg" />
      <img name="Endoscrinium_luridum_sensu_Gocht.jpg" timestamp="2015-09-01T05:30:11Z" user="Maintenance script" url="http://dinoflaj.smu.ca/dinoflaj2/images/1/14/Endoscrinium_luridum_sensu_Gocht.jpg" descriptionurl="http://dinoflaj.smu.ca/wiki/File:Endoscrinium_luridum_sensu_Gocht.jpg" ns="6" title="File:Endoscrinium luridum sensu Gocht.jpg" />
      <img name="Ectosphaeropsis_burdigalensis1.jpg" timestamp="2015-09-01T05:30:11Z" user="Maintenance script" url="http://dinoflaj.smu.ca/dinoflaj2/images/1/14/Ectosphaeropsis_burdigalensis1.jpg" descriptionurl="http://dinoflaj.smu.ca/wiki/File:Ectosphaeropsis_burdigalensis1.jpg" ns="6" title="File:Ectosphaeropsis burdigalensis1.jpg" />
      <img name="Danea_impages_A.jpg" timestamp="2015-09-01T05:30:11Z" user="Maintenance script" url="http://dinoflaj.smu.ca/dinoflaj2/images/1/14/Danea_impages_A.jpg" descriptionurl="http://dinoflaj.smu.ca/wiki/File:Danea_impages_A.jpg" ns="6" title="File:Danea impages A.jpg" />
      <img name="Alterbidinium_distinctum.jpg" timestamp="2015-09-01T05:30:11Z" user="Maintenance script" url="http://dinoflaj.smu.ca/dinoflaj2/images/1/10/Alterbidinium_distinctum.jpg" descriptionurl="http://dinoflaj.smu.ca/wiki/File:Alterbidinium_distinctum.jpg" ns="6" title="File:Alterbidinium distinctum.jpg" />
      <img name="Xenikoon_australis.jpg" timestamp="2015-09-01T05:30:10Z" user="Maintenance script" url="http://dinoflaj.smu.ca/dinoflaj2/images/1/1f/Xenikoon_australis.jpg" descriptionurl="http://dinoflaj.smu.ca/wiki/File:Xenikoon_australis.jpg" ns="6" title="File:Xenikoon australis.jpg" />
      <img name="Valensiella_spp.jpg" timestamp="2015-09-01T05:30:10Z" user="Maintenance script" url="http://dinoflaj.smu.ca/dinoflaj2/images/1/1c/Valensiella_spp.jpg" descriptionurl="http://dinoflaj.smu.ca/wiki/File:Valensiella_spp.jpg" ns="6" title="File:Valensiella spp.jpg" />
    </allimages>
  </query>
</api>