No idea how to describe this :D

[keizo]

They sort of look like they belong in Annihilation (2018 film). Any ideas?

 

[Stephen Glover]

Hard to tell, look up Spirobid worms.

 

[Cell]

I believe it's a type of sponge.

 

[vetteguy53081]

They sort of look like they belong in Annihilation (2018 film). Any ideas?

This is clatharina sponge which as you can see can quickly spread. Remove with edge old old credit card or similar and discard