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Siphonal notch
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A siphonal notch is a feature of the anatomy in some , marine .

In these particular groups of sea snails the animal has a soft tubular extension of the mantle called a siphon through which water is drawn into the and over the and which serves as a to locate food. This siphonal opening also serves for the exit of the water that has entered by the branchial opening.

The siphonal notch is a noticeable notch situated at the most posterior part of the aperture of the shell, through which the siphon is extended when the animal is active. The notch at the posterior end of the aperture is also called the anal notch, anal sinus, anal canal or posterior canal.

Instead of a simple siphonal notch, some gastropods have an elongated , a hard shell tube which extends out from the anterior edge of the aperture.


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