I dont think parasites reproduce like that. I believe they have to have a host(living host such as a fish). Then some will drop off into the sand and reproduce. I dont think they attach to a rock and form a "cocoon" like that. I agree with the other poster, I think its probably some type of snail egg..
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.