Nudibranch ID -- Supposed to be Lettuce?

[rappo]

I bought this Nudi last Sunday. He's supposed to be a Lettuce Nudi, but when I looked up images online, nothing was close enough to this guy to make me 100% certain that's what it is. The very edges of his ridges are a reddish-purple color, immediately followed by a bluish color. The rest of the body is green with white/blue spots.

http://img151.imageshack.us/img151/5052/nudi1ge4.jpg (http://imageshack.us)
http://img151.imageshack.us/img151/8908/nudi2ww3.jpg (http://imageshack.us)

Sorry if the image sucks... I tried with and without flash.
Is it a lettuce?

[petoonia]

I just saw a pic of one of these on someones avatar. Heres the profile:

http://reefcentral.com/forums/member.php?s=&action=getinfo&userid=127054

[kmk2307]

There are several species commonly called "lettuce nudibranchs." It is a member of the family Elysiidae and more correctly called a lettuce sea slug (it isn't really in the order Nudibrancha). Check out this webpage and look through the list of Elysia sp. http://www.seaslugforum.net/specieslist.cfm.

Can you post a clearer picture of the head of the animal just to be sure?

HTH,
Kevin

[rappo]

Kevin, thanks for the help so far. I looked through Elysia sp. and didn't see anything that stood out as being my nudi. I think I got a better picture, hope it helps:

http://img209.imageshack.us/img209/9279/nudivz5.jpg (http://imageshack.us)

[kmk2307]

That does look like Elysia to me. How big is it? Are you seeing it eat algae?

[rappo]

It's about as long as a quarter is wide. Yes, it's eating algea. Which Elysia do you think it is?

[greenbean36191]

It's a juvenile Elysia diomedia.