On what conditions would a four-eyed creature evolve to have six eyes?

I'm designing an alien world on which its creatures evolved from four-eyed early life forms. However, there is a fair amount of other beings that have six or even eight eyes. How could such creatures develop six or more eyes out of just four? Did their eyes sort of slit up into more like a dividing cell? Or did their new pair of eyes gradually developed?

Note: Keep in mind, that the creatures of this world are vertebrates and not some sort of arthropods.

is a duplicate

This question has been asked before and has already been answered. It should be marked as a duplicate.

Please enter the URL of the proposed duplicate in the details field below.

not constructive

This question cannot be answered in a way that is helpful to anyone. It's not possible to learn something from possible answers, except for the solution for the specific problem of the asker.

Communities

On what conditions would a four-eyed creature evolve to have six eyes?

0 comment threads

0 answers