Is this a Jorunna sp??

October 24, 1999
From: Des Paroz

Hi Bill

I spotted this slug on a dive at Toothbrush Island, Wollongong, southern New South Wales, last Sunday (17/10/99).

It was sitting at a depth of about 14m on a wall. Water temp was about 17C - there appears to have been a warm current since the previous week, as temp jumped about 3C.

It looks like a critter referred to be Debelius as Jorunna sp., however it doesn't look at all like the Jorunna sp. on the Seaslug Forum.

Any information would be much appreciated.

Best regards

Des Paroz

Paroz, D., 1999 (Oct 24) Is this a Jorunna sp??. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Des,
'Jorunna sp.' is just shorthand for 'a species of Jorunna which either is unnamed or I don't know its name'.

In this case your nudibranch is an unnamed species of Jorunna which seems to have quite a wide distribution in the Indo-west Pacific. It usually has a yellow background colour but can be quite white which confuses it with small animals of Jorunna funebris.

I suspect the grey sponge in both the photos is its food. If by chance you actually see it feeding or with its mouth in an excavated hole, a photo would be very valuable evidence.

I have renamed Jorunna sp, Jorunna sp. 1 in the Forum. It is also an unnamed species, so for convenience, I am calling the black-spotted one 'Jorunna sp. 2'.
Best wishes,
Bill Rudman.

Rudman, W.B., 1999 (Oct 24). Comment on Is this a Jorunna sp?? by Des Paroz. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Jorunna sp. 2.

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