pseudostome

noun4

1. •
   The oral opening on the pseudembryo of an echinoderm.
2. •
   A false osculum or secondary opening which replaces the original osculum of a sponge.
3. •
   A false opening that resembles a stoma but without any true aperture.

   • The opening is via a pseudostome situated on the chamber or at the top of a neck which flares out to form a collar. — 1985
4. •
   A North American rodent, Geomys bursarius.