There are two different communications here. It is surely implied in Genesis 2:19 that God communicate with Adam, otherwise Adam would not have known that God wanted him to name the animals.
“Out of the ground the LORD God formed every beast of the field and every bird of the air, and brought them to Adam to see what he would call them. And whatever Adam called each living creature, that was its name.” (Ge 2:19 NKJV)
Incidentally, I don't see anything there about naming new species as they are discovered. It says that God brought the animals to Adam for naming.
Secondly, God communicates with mankind through His written word, including Genesis. I agree that Adam naming the animals was part and parcel of his stewardship.