Spinneret

A spinneret is a silk-spinning organ of a spider or the larva of an insect. Some adult insects also have spinnerets, such as those borne on the forelegs of Embioptera. Spinnerets are usually on the underside of a spider's opisthosoma, and are typically segmented.

While most spiders have six spinnerets, some have two, four, or eight.
They can move both independently and in concert.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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