Wormface

The "Wormfaces" (as they're referred to by Kip Russell) are a sapient, extremely hostile spacefaring race which evolved on an Earth-like planet somewhere in the close vicinity of the Sol System.

Biology
They're bipedal creatures with purplish skin, and stand about five feet in height, though their shortness comes from the fact that their legs are very short and squat, and their feet are large and rather disc-like in shape. Despite that, they move with great speed. They also have a tail which helps support their weight when they stand, rendering them as basically tripedal. They have four arms, each very long and with far more joints that a human's arm. The face has a pair of bulging eyes and no visible nose - although they're known to breathe oxygen - and the mouth is triangular, made from three insectile mandibles. Inside the mouth there are rows of tiny teeth and numerous wriggling tendrils. An additional third eye is present on the back of the head. They're also described as having a "faint sweetish musky odor".

Culture and society
Their society is ruled by a group of Queens, suggesting that they evolved from eusocial ancestors. They are carnivorous, and consider themselves as the only intelligent species in existence. All the other races are viewed by them as mere animals, therefore the "Wormfaces" have no problem with feeding on them, invading their planets and even exterminating them.

History
Their species has been put on trial by the Three Galaxies, who determined that they were a threat and sentenced them to extinction by "rotating" their planet out of spacetime, thus isolating the planet and everyone in it from the rest of the universe, including their local star.

Appearances

 * Have Spacesuit - Will Travel, by Robert A. Heinlein (1958)