Polythyridium

The polythyridium is a component of the gut that surrounds the entrance of the intestine in priapulids of genus Tubiluchus. It comprises tuberculate and hairy plates associated with a strong muscle. These plates may help to keep unwanted particles out of the gut.[1]

References
  1. J. van der Land (1970). "Systematics, zoogeography, and ecology of the Priapulida". Zoologische Verhandelingen. 112 (1): 1–118. ISSN 0024-1652.
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