Answer:
It is an insect, and the first part of its name is the name of another insect. What is it?
I'm a red creature from the sea with large claws, or pincers, and I'm often boiled and served as an expensive dish at seafood restaurants.
What wears a coat in the winter and pants in the summer?
What can provide food before it is alive, while it is alive and after it's dead?
From that which comes within itself, It builds its table on my shelf.
You can always see it, but it's too far away to touch. Mountains rest on it, and at sea it surrounds you. What is it?