May 8, 1999
From: Ian Skipworth
Here is an image of a nudibranch or slug of some type. This was taken by me at the Poor Knights Islands [northeastern New Zealand] about a year and a half ago. For a while I forgot about the picture but reviewed it recently and started to wonder what it might be.
The slug is rather small and I have had to crop the 35mm frame fairly severely. This is despite the fact that it was taken with a 60mm micro Nikkor which does focus to 1:1. So, I am not quite sure just how small it is but guess it is probably less than 10mm long.
Any assistance you can provide would be much appreciated.
firstname.lastname@example.orgSkipworth, I., 1999 (May 8) Caldukia rubignosa from New Zealand. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/851
This is Caldukia rubignosa a bryozoan-feeding nudibranch closely related to Janolus mokohinau. It is known only from northeastern New Zealand but there is a similar species Caldukia affinis which is found quite commonly in southeastern Australia.
As you judged from your photo, they seldom grow much larger than a centimeter.