It doesn't say it because there's no reason to think it. When you start dreaming about intermediate forms, then ideas of other species may come into play which denigrate the dignity with which God created man.
And by the way, there's no reason that one cannot use theology when studying secondary and/or constituent parts. God is in the minutae as well as in the transcendent. He created science and true science leads to theology.
“It doesn’t say it because there’s no reason to think it. When you start dreaming about intermediate forms, then ideas of other species may come into play which denigrate the dignity with which God created
You find a lack of dignity in evolution and it doesn’t square with how you read Genesis. The Catholic church doesn’t see it that way. Even if I weren’t Catholic, I wouldn’t either. Also the Church has long had a method for seeking understanding based on the kind of knowledge being sought, seeing Theology as a greater science and philosophy as a lesser one. Both are considered attempts to discern truth, the one looking at the first cause of all things being theology.