Can someone please help identify this incredible creature that I found in a bay near Cienfuegos, Cuba? I was thinking some sort of nudibranch, but I couldn't find any online that looked exactly the same.
/r/zoology: Zoology - Welcome to r/Zoology: A community about the scientific study of the behavior, structure, physiology, classification, and distribution of animals. Please read the rules for submissions - June 13, 2019 - 15:29