How would you describe this?
Are called"species of special concern.
A sentence fragment missing a simple subject, complete subject, or complete predicate
What do you think?
a sentence fragment missing complete subject?
You're right.
To describe the given sentence fragment, it appears to be missing a simple subject, complete subject, or complete predicate. Without a complete subject, it is difficult to determine who or what "Are" refers to. Similarly, without a complete predicate, we don't know what action or attribute is being ascribed to the subject.
In order to provide a more accurate description, it would be helpful to have the complete sentence from which this fragment is derived.