I do not think anyone maintains that scientific names can be copyrighted.
Descriptions are a different matter.
The whole idea opens up an entire tin-plated steel container of annelids. Even if you and I write descriptions of the same organism without looking at each other's writing, the two descriptions will be very similar. By the usual standards applied to prose fiction, one would be a plagiarizing of the other. Descriptive biology would die an agonizingly painful death.