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In each of the successively more derived clades Ornithodira, Dinosauria, and Saurischia, the primitive state was an increasingly long neck 
  <ul id="references">
    <li itemprop="citation" itemscope itemtype="http://schema.org/ScholarlyArticle" id="ref-1">
      <span itemprop="author" itemscope itemtype="http://schema.org/Person">
        <span itemprop="familyName">Sereno</span> <span itemprop="givenName">PD</span>
      </span> 
      (<span itemprop="datePublished">1991</span>)
      <cite itemprop="name"><a itemprop="url" href="http://dx.doi.org/10.2307/3889336">Basal archosaurs: phylogenetic relationships and functional implications</a></cite>
      <span>
        <cite class="source">Society of Vertebrate Paleontology Memoir</cite> <span class="volume">2</span>:<span class="fpage">1</span>
      </span>
    </li>
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