Pseudobornella orientalis

April 16, 2002
From: Nishina Masayoshi

Dear Bill,
Here is a photo of Pseudobornella orientalis Baba, 1932 photographed by Pamun who is an owner of a diving operation named MIRISSA at Osezaki Beach, Suruga bay, Izu Peninsula. She often gives me information on sea slugs which lives in Osezaki.

I have never seen this animal but it has a very unique feature, which I hope you can see in the photo - the long thread on the rhinophore. There is able to stretch to about two times the body length. Pamun says that this animal lives in the sand in the daytime and when night comes, it creeps
out on the sand.

DATE:5 April 2002
LOCATION:Ose beach, Suruga bay, Izu Peninsula, Japan
LENGTH: about 25mm

Best Regards,
Nishina Masayoshi

Masayoshi, N., 2002 (Apr 16) Pseudobornella orientalis. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Nishina,
Thanks for this very interesting photo. It is the first time I have seen a photo of the whole animal. As far as I know it is the first information since it was described by Baba in 1932. I have copied some of Baba's drawings on a separate page.

It is exciting to hear that this is another sand-dwelling nudibranch. Perhaps the long extensile 'tentacle' is associated with its burrowing habit. It would be great to confirm that it feeds on the hydroid Tubularia as reported to Baba by his collector.
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Apr 16). Comment on Pseudobornella orientalis by Nishina Masayoshi . [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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