Osculum

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

The osculum (pl.: oscula) is an excretory structure in the living sponge, a large opening to the outside through which the current of water exits after passing through the spongocoel. Wastes diffuse into the water and the water is pumped through the osculum carrying away with it the sponge's wastes.

Excerpt from the Wikipedia article “Osculum”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Yoruno Original uploader was Esculapio at it.wikipedia, CC BY-SA 3.0, via Wikimedia Commons.