How is it possible that cnidarians evolved so many different ways to acomplish the same thing? Unipolar and multipolar ingression, invagination, delamination, epiboly… All the paths lead to ‘planula’ – a torpedo bilayered swiming larva.The term is ‘equifinal development’ and it concerns interspecific and also intraespecific variations, which are quite common among cnidarians and sponges. [...] The post Embryogenesis: an experiment that went too well appeared first on the Node .