What is this hitchhiker?

[fick]

It's very small.

 

[Calappidae]

Pseudeceros sp.? Some short or flat worm or nudibranch..

 

[pagojoe]

Nah, it's neither, it's an elysiid, and judging by the bright colors, streamlined appearance, and large rhinophores, it's probably a species of Thuridilla. There are a couple of Thuridilla species that are pretty close in coloration, but I don't know of one that's an exact match...maybe because it would look somewhat different if it were adult. It will be an algae eater, in any case.

Cheers,



Don

 

[Calappidae]

That will eat algae?... lucky... thats a beautiful one too..

 

[fick]

Thanks! Yup looking at other pictures it looks like Thuridilla. And it was definitely chowing down on algae.