Some of the first mutualistic relationship came to exist in the Quatrilidae and Septoilinae clades. Drieop, also known as Drieopus, is a species closely related to Vieri. They are named like that because of their 3 segments (drie is Dutch for three). Zesoid is a small species of Septoilinae, closely related to Zeventus, they are known for having a six sided cell wall (zes is Dutch for six). Drieops and Zesoids have a mutual relation, meaning that both the species gets benefits from eachother. Inside the cell wall of the Drieops consists of around 8 Zesoids, to keep them safe from the outside world. In exchange they profide energy for the Drieops.
