Aplysia siphon

June 15, 2002
From: Angie Berg

Hello, I'm doing a brief presentation on the neurobiology work that has been done on Aplysia. I would like to be able to point out the siphon, but I haven't found a picture or diagram where it is either obvious or labelled. Could you describe where the siphon is to me, or point me in the direction of a good picture?
Thanks!
Angie Berg
Duke University

amb30@duke.edu

Berg, A., 2002 (Jun 15) Aplysia siphon. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7258

Dear Angie,
The best photo I have showing the mantle cavity and siphon of a Sea Hare is this one of Siphonota geographica which is closely related to the genus Aplysia. The siphon, sometimes called the anal siphon, exhalent siphon or pallial siphon, is a tube formed from a fold in the posterior edge of the mantle, which directs the exhalent water current out of the mantle cavity. In this photo, the round bit in front of the siphon is the mantle which encloses the flattened shell which partially covers the gill. The anus is at the base of the siphon and so faecal matter is washed out with the exhalent current. Usually the parapodia are folded over the body to enclose the mantle region. When the parapodia are folded over, there is an anterior gap through which water enters the parapodial chamber and is drawn down over the gill.

I hope that makes sense. If you would like to contribute your presentation on neurobiology work that has been done on Aplysia to the Forum, it would make a welcome addition.
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Jun 15). Comment on Aplysia siphon by Angie Berg. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7258

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