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What is a pseudostome?

What is a pseudostome? Here are some definitions.

Noun
  1. (biology) The oral opening on the pseudembryo of an echinoderm.
  2. (biology) A false osculum or secondary opening which replaces the original osculum of a sponge.
  3. (more generally) A false opening that resembles a stoma but without any true aperture.
  4. A North American rodent, Geomys bursarius.
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