My Blood is Blue. Who am I ?

If I were to bleed from a wound or two,
You'd note in amazement, my blood is blue.
I am found as a fossil in ancient stone,
Yet living today, I'm almost a clone.
My eyes will adjust a great many fold.
To see by the moonlight, who I can hold.
If I could tell my mate, I would say it was true,
These wonderful eyes are only for you.
I'm one of the last to die from pollution,
A living exception to evolution.
Who am I ?

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A Horseshoe Crab