Wiki: Tewet
Tewet are a species of genetically-engineered aliens adapted from aquatic parasites on a water world at (0.5, 0, 0). They were developed to be biological memory augmentation devices, but they developed unexpected self awareness after general release.
Most of the prototype variations died out or were eradicated except for the Kemtewet. Gertewet are all that remain of the general release.