Ink Glands in Octopus and Sea Hares

March 21, 2002
From: Nadine Schoene

Is there any homology between the ink-producing glands of Sea Hares and cephalopods?
Thanks,
Nadine Schoene

inia@zedat.fu-berlin.de

Schoene, N., 2002 (Mar 21) Ink Glands in Octopus and Sea Hares. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6504

Dear Nadine,
The short answer is definitely 'no'. If you look at the list of references you will see there has been a lot of research on the purple ink in Sea Hares but we are still not sure whether it has a role in chemical defence. I am not sure if anyone has actually compared the cephalopod ink gland with that of Sea Hares, but they are so distantly related, there is no reason to suspect that the glands have the same origin.
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Mar 21). Comment on Ink Glands in Octopus and Sea Hares by Nadine Schoene. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/6504

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