What is this nudibranch?

[Astrivian]

Okay, i have seen two of these nudibranchs crawling around my tank for a while and i am wondering what they might be. Every time i see them, they are on some kind of algae: Bryopsis (HA), calipura, or other macro. I have never seen them on the red ogo. I checked some books and i think it might be Elysia Ornata.

I have three pics of them. The pics might all be of the same one or of each, i am really not sure. At one point i did see two at the same time.

http://farm2.static.flickr.com/1020/847584287_e84083ca39.jpg?v=0

http://farm2.static.flickr.com/1188/847584239_2728c4d011.jpg?v=0

http://farm2.static.flickr.com/1197/847584279_87d273d0b8.jpg?v=0

[Astrivian]

Got it.

It is a species of Oxynoe and feeds on caulpera. I found it on the Sea Slug Forum (http://www.seaslugforum.net/factsheet.cfm?base=oxynviri).

Interestingly, i can nail down exactly where this came from. All of my live rock was aquacultured off the coast of Florida. When i got it, the rocks were covered in a variety of caulepra types. This little bugger must have been feeding on them. Interestingly, it survived the cycling of the tank okay.

[lReef lKeeper]

interesting slug, and a hardy one !! that is something you dont see everyday.