Euselenops luniceps - feeding & swimming

October 27, 2002
From: Tomohiko Kurihara

Dear Bill.
To accompany my other message, here is some observations on Euselenops luniceps swimming and feeding.

Upper Photo: Showing oral tube everted and ingesting particles. Length 70mm, depth 4m at night. October, 2002.
Lower photo: Front view of animal swimming. Length 70mm, depth 4m, at night. October, 2002
Photos: Tomohiko Kurihara

When searching for food it uses sensory papillae under the oral veil. When it senses some food, the mouth sometimes projected out under the veil. Here is a photo of it feeding. However whatever it ate, I think it probably swallowed it with sand. I would like to know what food E. luniceps is eating.

When I touched one, it could swim very well for over 20 minutes, as in Andrew's and Akos's messages.

Best regards,
Tomohiko Kurihara

Kurihara, T., 2002 (Oct 27) Euselenops luniceps - feeding & swimming. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Thanks Tomohiko,
These are very interesting observations. Your upper photo shows the sensory papillae on the underside of the oral veil very clearly. I have never seen the oral tube everted so clearly. It looks just how the oral tube acts in species of Pleurobranchaea when that related slug is feeding. I agree that the particle it seems to be ingesting is a piece of shell. Unfortunately we don't know what this species feeds on. I susepect it may be small crustacea, but perhaps like species of Pleurobranchaea it will eat any suitably sized pieces of animal material, alive or dead. If you get a chance to test one with a variety of foods, it would be interesting to know.

Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Oct 27). Comment on Euselenops luniceps - feeding & swimming by Tomohiko Kurihara. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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