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Where is the anus located in a bryozoan zooid?
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moss animal
Eurystomella bilabiata, a moss animal from the Order Cheilostomata.
In a bryozoan zooid, the anus is situated just outside the lophophore, which is the ring of ciliated tentacles used for feeding.12
This positioning is a defining characteristic of the phylum Bryozoa, which is also known as Ectoprocta—a term derived from Greek meaning "outside anus". Because the digestive tract forms a deep loop, the rectum rises from the stomach to terminate at this location, placing the exit point near, but external to, the tentacle ring.21