external gill - occurs in some mollusks and in tadpoles and other immature amphibiansHow to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content.
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external gill |
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The hyomandibula, which in bony fish helped move the operculum (the external gill flap) to aid in gill ventilation, was no longer necessary because the presence of lungs in early tetrapods allowed for independence from the gills. The fine ash preserved many of the doomed creatures' soft tissues, including eye lenses, external gills, and tadpole-like tails. |
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