In previous iterations of the nursery menu the alt-species/genera were listed as skins. I preferred the menu this way because right now the nursery looks a little cluttered with all the alt-species in my opinion.
Therefore I would like to suggest a toggle-able UI filter which hides all the alt-species within their respective genera.
Maybe there could be a separate list next to the skins that displays them?
Edit:
I do see the objections regarding different habitat needs and breeding.
What if we did it like this:
when you click e.g. Torvosaurus in the Nursery menu a separate smaller menu with just the two species would pop up. That way it's very obvious that it's not just different skins.
Also remember, I just want it as an option. If player confusion is a concern you can even hide the toggle deep in some advanced settings menu.