These were taken in Cozumel. Not my best photos, I know. The closest ID I can find is in Mickey Charteris' book Caribbean Reef Life, and that is the Warty Aeolid. The photo in the book is similar to my pictures but when I look on the internet, I get something totally different. I've reached out to Mickey for his thoughts but wondered if anyone here had any ideas?

Taken with Olympus EM-1 Mk III, Olympus 30mm lens and Backscatter HF-1 strobe.

Edited September 5, 2025Sep 5 by JS1221

Nuidbranch names do change quite often and also it is best to use the scientific name when searching as the common name can be shared by a number of species. Google search the scientific name to see if what comes up matches your pic.