The exact species of these trees has been a matter of debate.

This signals to the reader that we are indicating a particular, exact species.

"Do you gentlemen suppose we could discuss its exact species some other time?"

They vary greatly in colour depending on the exact species involved.

It is unclear on the exact species of duck the name refers to.

The exact species which created the Sphingopus tracks have not been identified.

The exact species involved in this epidemic has been identified as An.

Here a baby saurischian dinosaur was discovered in 1974, yet the exact species could not be determined.

Well, I don't have enough detail to give us an exact species.

The two share many of the same genera, but differ in the exact species.