Taalo
The Taalo are a race of rock like beings, which, although sharing a base of silicon with the Chenjesu, are very little reminiscent of them.
The Taalo were the first sentient race to encounter the Ur-Quan, and enlisted them into the Sentient Milieu. They were the only race that did not invoke the Ur-Quan's inherent territoriality, and the two species became close friends. They were immune to the Dnyarri Psi powers, so the Dnyarri forced the Ur-Quan to destroy them. For a long time, the Taalo were thought to be extinct, however, speculation has some believe that the Taalo live. They were the only race of the Sentient Milieu (that we know of) that lived in the SC2 starmap's area. The Taalo may well still exist in some form, as the Orz refer to them in the present tense. Even if they do not exist, some of their artifacts may remain in their home star regions.