
<p>
  The Macro-Invertebrate Key guides you through identification of a dragonfly larva (or nymph) using questions and photos. The key begins with a quick check of other aquatic invertebrates, to make sure you&rsquo;re on the right track with your specimen.</p>
<p>
  <strong>Aquatic Macro-invertebrates (Phylum: Arthropoda; Class: Insecta)</strong>
  <br />
  <br />
  We will focus on insects but there are other aquatic macro-invertebrates that are part of the Phylum: Arthropoda, such as:</p>
<ul type="disc">
  <li>
    Sub-phylum: Crustacea (for example, crayfish)</li>
  <li>
    Phylum: Mollusca (snails, mussels, clams)</li>
  <li>
    Phylum: Annelida (leeches)</li>
</ul>
<p>
  <strong>If you&rsquo;re interested in identifying some of the other macro-invertebrates you might have found, start <a class="link1" href="http://www.umd.umich.edu/eic/insectkey.htm">here</a>.</strong>
  <br />
  <br />
  Aquatic macro-invertebrates that are insects and that inhabit North America include:</p>
<table border="0" style="width: 570px">
  <tbody>
    <tr>
      <td style="overflow: hidden; width: 250px;">
        <a href="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/anax_junius_nymph.jpg" rel="lightbox" title="Anax junius">
          <img alt="" border="0" class="thumb" src="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/anax_junius_nymph_thumb.jpg" />
        </a>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <i>Anax junius</i>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <a href="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/Odonata_Lestes_32.jpg" rel="lightbox" title="Lestes eurinus">
          <img alt="" border="0" class="thumb" src="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/Odonata_Lestes_32_thumb.jpg" />
        </a>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <i>Lestes eurinus</i>
      </td>
    </tr>
    <tr>
      <td style="overflow: hidden; width: 250px;">
        <a href="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/Odonata_Lestes_Prementum_50.jpg" rel="lightbox" title="Lestes eurinus (prementum)">
          <img alt="" border="0" class="thumb" src="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/Odonata_Lestes_Prementum_50_thumb.jpg" />
        </a>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <i>Lestes eurinus (prementum)</i>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <a href="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/enallagma_nymph.jpg" rel="lightbox" title="Enallagma civile">
          <img alt="" border="0" class="thumb" src="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/enallagma_nymph_thumb.jpg" />
        </a>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <i>Enallagma civile</i>
      </td>
    </tr>
    <tr>
      <td style="overflow: hidden; width: 250px;">
        <a href="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/ischnura_verticalis_nymph.jpg" rel="lightbox" title="Ischnura verticalis">
          <img alt="" border="0" class="thumb" src="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/ischnura_verticalis_nymph_thumb.jpg" />
        </a>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <i>Ischnura verticalis</i>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <a href="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/callibaetis_adult.jpg" rel="lightbox" title="Callibaetis spp. (Adult)">
          <img alt="" border="0" class="thumb" src="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/callibaetis_adult_thumb.jpg" />
        </a>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <i>Callibaetis spp. (Adult)</i>
      </td>
    </tr>
    <tr>
      <td style="overflow: hidden; width: 250px;">
        <a href="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/callibaetise.jpg" rel="lightbox" title="Callibaetis spp.">
          <img alt="" border="0" class="thumb" src="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/callibaetise_thumb.jpg" />
        </a>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <i>Callibaetis spp.</i>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <a href="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/hydrometra.jpg" rel="lightbox" title="Hydrometra spp.">
          <img alt="" border="0" class="thumb" src="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/hydrometra_thumb.jpg" />
        </a>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <i>Hydrometra spp.</i>
      </td>
    </tr>
    <tr>
      <td style="overflow: hidden; width: 250px;">
        <a href="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/belostoma_dorsal.jpg" rel="lightbox" title="Belostoma flumineum">
          <img alt="" border="0" class="thumb" src="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/belostoma_dorsal_thumb.jpg" />
        </a>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <i>Belostoma flumineum</i>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <a href="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/tropisternus.jpg" rel="lightbox" title="Tropisternus spp.">
          <img alt="" border="0" class="thumb" src="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/tropisternus_thumb.jpg" />
        </a>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <i>Tropisternus spp.</i>
      </td>
    </tr>
    <tr>
      <td style="overflow: hidden; width: 250px;">
        <a href="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/hydrophilus_42.jpg" rel="lightbox" title="Hydrophilus spp.">
          <img alt="" border="0" class="thumb" src="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/hydrophilus_42_thumb.jpg" />
        </a>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <i>Hydrophilus spp.</i>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <a href="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/berosus_dorsal_48.jpg" rel="lightbox" title="Berosusp spp.">
          <img alt="" border="0" class="thumb" src="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/berosus_dorsal_48_thumb.jpg" />
        </a>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <i>Berosus spp.</i>
      </td>
    </tr>
    <tr>
      <td style="overflow: hidden; width: 250px;">
        <a href="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/trichoptera_case.jpg" rel="lightbox" title="Family: Phryganeinae – case">
          <img alt="" border="0" class="thumb" src="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/trichoptera_case_thumb.jpg" />
        </a>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <i>Family: Phryganeinae &ndash; case</i>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <a href="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/trichoptera_larva.jpg" rel="lightbox" title="Family: Phryganeinae">
          <img alt="" border="0" class="thumb" src="http://www.parkcitizenscience.org/dragonfly/diagrams/diagram_images/trichoptera_larva_thumb.jpg" />
        </a>
      </td>
      <td style="overflow: hidden; width: 250px;">
        <i>Family: Phryganeinae</i>
      </td>
    </tr>
  </tbody>
</table>
<ul type="disc">
  <li>
    Dragonflies (Order: Odonata, Sub-order Anisoptera)</li>
  <br />
  <li>
    Damselflies (Order: Odonata, Sub-order Zygoptera)</li>
  <br />
  <li>
    Mayflies (Order: Ephemeroptera)</li>
  <br />
  <li>
    Stoneflies (Order: Plecoptera)</li>
  <br />
  <li>
    True bugs (Order: Hemiptera)</li>
  <br />
  <li>
    Dobsonflies, fishflies, alderflies (Order: Megaloptera)</li>
  <br />
  <li>
    Water beetles (Order: Coleoptera)</li>
  <br />
  <li>
    Caddisflies (Order: Trichoptera)</li>
</ul>
