Information from The Rani Reaps the Whirlwind (audio story) are missing.
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Tetraps were somewhat like a combination between a human, bat and boar. They were stocky creatures covered in brown fur. They had sharp, clawed hands and vestigial wing-flaps around their arms. Tetraps had four eyes: one in the front, one on each side, and another on the back. They had poor vision and needed to be facing the same way in order to properly focus. They also had four ears, two facing forward and two facing back. Tetraps had a forked tongue which could inject a paralysing poison. They fed on blood plasma and slept upside down like bats.
The Tetraps were employed by the Rani in her experiment with a Time Brain on Lakertya. They would bully the native Lakertyans and enforce the Rani's will. The Time Brain would then use a strange-matter asteroid to change the universe more to the Rani's liking. When the Tetraps learned that the experiment would kill them (and the native Lakertyans), they kidnapped the Rani to bring her back to Tetrapyriarbus. (TV: Time and the Rani)