<em>Amiskwia sagittiformis</em> (IMAGE)
Caption
The fossil, Amiskwia sagittiformis from the Burgess Shale (508 million years old), preserving bilateral jaw elements inside its head. These jaw elements resemble those seen in rotifers and gnathostomulids, while the body resemble arrow worms.
Credit
Photo credit Luke Alexander Parry/University of Bristol--Yale University
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