apertural muscle
(BRYOZOA: Gymnolaemata)
One of either two pairs of muscles of cheilostomate autozooids, the occlusor muscle of the operculum or the diaphragmatic dilator muscle.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

  • Operculum (gastropod) — Gastropod shell of the freshwater snail Viviparus contectus with corneous operculum in place …   Wikipedia

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