Help ID'ing Unknown Gastropod

Biokabe

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After lights out today, I noticed a gastropod of some type that I didn't remember putting into the tank. When I first saw it out of the corner of my eye, I thought it was one of my berghia, but upon initial inspection, it clearly wasn't a berghia.

It was about 1/2"-3/4" long, pale green or yellow. Ridges on either side of its body with a distinct head and neck, eyestalks quite prominent. It didn't have any celata. In the body it had what looked to be a harder, white spot - possible the beginnings of a shell. No spotting or striping to the body, it was all one color.

I went to grab my phone to take a picture, but by the time I came back it had crawled somewhere where I couldn't see it.

It almost looked like a stomatella, but I couldn't get a good enough look to say for sure. Also bore a superficial resemblance to a lettuce nudi, but I'd be pretty surprised if that was it.

Any ideas to help me narrow down my search? I'll try and get a picture, but no guarantee I'll have success.

Edit: It had come back out just before I went to bed, so I managed to get a few pictures of it. Nudi Hitchhiker.jpg

Looking at it up close, I think and hope that it's some kind of Elysia nudi. It has a pair of ridges (hard to see in this picture) that look like they're developing folds. Anyone else have any ideas? I have a few more pictures, but this one came out the best. It was actually quite a bit smaller than I first thought - about 1/4" at best.
 
Last edited:
Elysia sp.
 

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