What are these needle-like spines from the beach?

Question

There are these small, 1/2 - 1/4 inch long clear needle-like spines that stick to my suit and prick me! They look hollow, and they break very easily, but it stings if it gets stuck in you!!! What are these things?!

By the way, I encountered these in Daytona Beach.

Answer 1

A spine is a hard, thorny or needle-like structure which occurs on various animals. and sea urchins grow spines as a self-defense mechanism.