Jorunna rubescens from Bali

February 7, 2006
From: Marli Wakeling

Hi Bill,
When we were at Tulamben this past summer, Jorunna rubescens was the most common nudibranch on our night dives. There were lots of them around, and there were these ones mating.

Locality: Tulamben "The River", Bali, Indonesia. Depth: 20 feet. Length: 10 cm. 25 July 2005. Sand bottom. Photographer: Marli Wakeling


Wakeling, M., 2006 (Feb 7) Jorunna rubescens from Bali. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Thanks Marli,
This seems to be one of the opisthobranchs that sometimes appears in 'plague' proportions. Your upper photo rather nicely shows the spicules or caryophyllidia [see inset] on the skin. This is one of the reasons it is now considered to be a species of Jorunna. Your mating photo is also quite interesting because it shows part of the everted reproductive organs. Why this is interesting is because it is part of the reproductive system which we only see retracted in anatomical dissections. Because the anatomy of the reproductive organs is considered an important in comparing species and higher taxonomic work, new views of these organs are very valuable.
Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Feb 7). Comment on Jorunna rubescens from Bali by Marli Wakeling. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Jorunna rubescens

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