Species
Acorn Worm
Other Invertebrates
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The acorn worms, or Enteropneusta, are a class of hemichordate invertebrates whose closest non-hemichordate relatives are the echinoderms. There are 111 known species, the main species used in research being Saccoglossus kowalevskii. The class's two families, Harrimaniidae and Ptychoderidae, separated at least 370 million years ago.
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