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The Xindi were an alliance of species, composed of Xindi-Primates, Xindi-Arboreals, Xindi-Insectoids, Xindi-Reptilians, Xindi-Aquatics, and the extinct Xindi-Avians, who all evolved on the planet Xindus, located within the Delphic Expanse.
The Xindi killed millions of humans by attacking Earth in 2153, per orders of an extra-dimensional organization hoping to prevent to formation of the United Federation of Planets.
The Xindi had become a member of the Federation by the 25th century and had settled on the M Class world of New Xindus.