The Pahkwa-thanh were a species of space-faring reptiles which were in contact with the United Federation of Planets by the late 24th century. The Pahkwa-thanh strongly resembled the dinosaurs of prehistoric Earth, and retained many of the eating habits of these creatures with the reliance on eating raw meat. Some members of the species are known to possess empathic abilities, most members of the species have no measurable empathic talent.
Due to their appearance and behavior, Humans were known to be rather uncomfortable around members of the species. Because of this around only 100 members of the species, including Doctor Shenti Yisec Eres Ree, were the only Pahkwa-thanh to be serving in Starfleet in the 2370s. (Star Trek: Titan; Star Trek: Prometheus)