A siloti was an animal on Pollux V. The siloti descended from those original inhabitants of the planet, the Nauians, who did not manage to retreat to the underground shelters. Those survivors devolved to nonsentient yet intelligent animals during the ensuing meteor cataclysm and ice age.
In the size of a cat, they combined an insectoid pattern with 4-legged reptilian form and forelimbs resembling a praying mantis. (TOS video game: Star Trek: 25th Anniversary)