1. Reptilians Insectoids Primates Arboreals Aquatics Weapon Probes

2. Rather hirsute in appearance, the Arboreals tended to be more peaceful than the Reptilians and Insectoids

3. While the Reptilians force Hoshi to decipher a launch code, the Primates, Arboreals and Archer think of a way to stop the Xindi weapon

4. Although they all share a series of ridges along their foreheads, there are five physiologically distinct species of Xindi: Primates, Arboreals, Reptilians, Insectoids, and Aquatics; the sixth species, Avians, is extinct

5. Xindi-Arboreals Perhaps the most patient and reflective of the five Xindi species, they wish to adhere to the original timetable for developing their Earth attack weapon, in defiance of the rush of the Xindi-Insectoids and Xindi-Reptilians upon the appearance of the NX-01 in the Delphic Expanse .