Gigantocytus taisa
As Gigantocytus rhizoma grew and spread some zoospore reach zone 17 along with Aquaductus networkus. They began to adapt to the change in salinity at the river delta. Over time they managed to live in Zone 17 by removing excess water through A. networkus. This led to G. taisa.
G. taisa is similar to G. rhizoma but it has developed a closer relationship with its symbiote, now Aquaductus sarcina. In addition to using A. sarcina as a way of removing excess water it also uses it to spread zoospores. They now release a inhibitor protein into A. sarcina when they intend to reproduce. The inhibitor protein causes the new cells formed by A. sarcina to be closed off on the end, G. taisa will then produce zoospores and fill these cells with zoospores. Once the zoospores have entered the cell it will close off the other side and become a sort of zoospore package. It will break off and float away carrying the zoospores. Once it lands in suitable substrate, being dead Micralgearous greana, it will open both sides and release the zoospores. The zoospores will attach to the dead M. greana and begin to develop mycelia that they will use until A. sarcina attaches to them. The A. sarcina package cell now with both ends open begins to feed on the dead M. greana and grow. It will attach to the zoospores that it delivered. This relationship ensures that G. taisa can reliable have A. sarcina and vice versa to rely on.
G. taisa grows shorter mycelia that it mostly uses to feed before A. sarcina connects to it them it relies mostly on the A. sarcina for food while it will store salts and nutrients to provide A. sarcina when needed. The developed zoospore now grows larger with a larger vacoule for holding more nutrients.