But genetic studies have shown single species of nematode worm, newly discovered inside figs, can develop into five distinct forms. It is a striking example of physical divergence without genetic divergence.“We were shocked,” says team member Erik Ragsdale of the University of Indiana. “It is remarkable and unusual.”Young Pristionchus nematodes hitch a ride to new figs on the wasps that fertilise the figs. If you look inside the fig soon after the wasps arrive, only a small form of the nematode can be found. It has a simple tube-like mouth for feeding on microbes.