No one knows exactly how many species currently exist.

I have dwelled here longer than your species has existed.

This species has not been found recently and may no longer exist.

"The species in question won't even exist a month from now."

He had not known that any such species existed in the Cluster.

He had the proof at last, from direct experience; such species did exist in the Cluster.

Further taxonomic work is required to determine how many species exist.

In my day a species existed which drew the blood of other animals, including men.

Find out how many species existed at some later time before humans evolved.

An estimated 20,000 species of ants exist in the world.