You sent me off on a tour of the internet about this topic that I'd never previously heard of and it ended here: https://whyevolutionistrue.wordpress.com/2014/

You sent me off on a tour of the internet about this topic that I'd never previously heard of and it ended here: https://whyevolutionistrue.wordpress.com/2014/07/16/there-are-no-ring-species/ https://whyevolutionistrue.wordpress.com/2014/07/16/there-ar... There are no known examples of ring species, which is a pity because it would be really cool.