Glossodoris sedna in Florida again

February 26, 2004
From: Paul Osmond

This past weekend [February 2004] in Biscayne National Park [Florida, USA] we once again found Glossodoris sedna - but this time we found a whole bunch of them. 10 individuals were spotted in a small area in about 3 meters (10 feet) of water and another diver reported also seeing other individuals on the same dive in a separate location. The images included are all of separate individuals found on 2 adjacent coral heads.

This is the third sighting of this species for me in the park and sixth sighting overall in Florida. At no time have I seen an individual on anything but algae covered rocks - I suspect that the species is eating the algae itself (or something on the algae) that is shown in several images of the species. For Florida where nudibranchs are not abundent in great numbers, 10 specimans is a herd, so the species is certainly thriving.
Paul
www.deepseaimages.com

marriard@deepseaimages.com

Osmond, P., 2004 (Feb 26) Glossodoris sedna in Florida again. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/12316

Thanks Paul,
As I said in reply to your earlier message [#10527] all chromodorids are sponge feeders but some seem to feed on sponges which tend to disguise their nature much of the time. By that I mean they seem either unable, to stop other animal colonies and plants from overgrowing them. Or perhaps they allow their colonies to be overgrown as a protection from predation. Whatever the reason there are a number of species, such as Ceratosoma brevicaudatum and Hypselodoris bennetti, which we have had difficulty in discovering their food sponges. But once we do we realise that usually these sponges look just like a piece of rock overgrown with algae.

Certainly when you find a group together it would be worth poking around where they are to see if the 'rock' is soft.
Best wishes
Bill Rudman

Rudman, W.B., 2004 (Feb 26). Comment on Glossodoris sedna in Florida again by Paul Osmond. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/12316

Factsheet

Glossodoris sedna

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