Re: Jorunna pardus

September 13, 2001
From: Dave Behrens

Dear Bill:
Well Bruce's message beat me to it, but I did want to respond to the Jorunna parva note from Nishina Masayoshi. I must admit that Nishina's Jorunna does look very similar to specimens of Journna pardus from California. Noteworthy also is that Echizen Beach, Japan is a temperate area sharing other species with California waters. Here are two additional photos of our Jorunna pardus from the California Channel Islands.

Please note that Jorunna pardus and J. parva can easily be separated by radular formulae, J. pardus having nearly twice the count of J. parva at:
21-42 x 2.23-30.0.23-30.2.


Behrens, D. , 2001 (Sep 13) Re: Jorunna pardus. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Thanks Dave,
The brown colour of the gills also seems to be consistently different, in J. parva only the edge of the gills being brown.
Bill Rudman

Rudman, W.B., 2001 (Sep 13). Comment on Re: Jorunna pardus by Dave Behrens . [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Jorunna pardus

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