April 26, 2007
From: Floor Anthoni
Here are some more photos of Chromodoris aureomarginata associated with sponges
Locality: Blue Maomao Arch. Poor Knights Islands, Northland, New Zealand. 25 Dec 2003. Photographer: Floor Anthoni
Dr J Floor Anthoni
As the close-up photo alongside indicates, I am pretty sure the aggregation of nudibranchs here is for mating rather than feeding. In rich substrates like this, it is impossible to be sure if an animal is attracted by a particular species of sponge, unless you actually catch it in the act. In fact most of the organisms here are not sponges - I can see bryozoans, ascidians, hydroids and an encrusting algae. The only sponge I can see is the bright reddish one in the lower right corner. Its possible there is a food sponge nearby but it is most probably in a crevice or partially overgrown.
These photos show the characteristic two-tone submarginal yellow band very well.
Chromodoris aureomarginata at Poor Knights
From: Ian Skipworth, April 26, 2007
Chromodoris aureomarginata feeding
From: Dr J. Floor Anthoni, April 26, 2007
Re: Chromodoris aureomarginata from NZ.
From: Lindsay Warren, June 28, 2004
Chromodoris aureomarginata from Fiordland, NZ.
From: Ian Skipworth, June 21, 2004