What is that?
I have no idea what this could be.
You are very lucky because we do! 😃 It is a siphosome (tail) part of a #corncob Siphonophore. You'll wind it under Head with tail.
They are actually colonies of many organisms with different functions living together as a large single organism!
Check out this post about various type of Siphonophores you can meet on Plankton Portal 😃
Hope you are enjoying the project.