Elastospondyli first emerged around 4211ma, evolving in response to the emergence of Dromaeopoda. They have a flexible gladius in their back, functioning as a springy bow that allows them to make big jumps and surprise their prey in ambush. They feed on Malacoformes and Platydontia. They are tree-dwelling ambush predators.
Following the thinning of the tropical forest, a branch of Elastospondyls evolved into Opisthoptera. The branch that did not evolve became the Archelastopondyli.