Whuffies from the planet Bix-VI, at first thought to be a true xenosophont species, later determined to be a fake species created by Progenitor Lord
Transapient who during the later Consolidation Age created a number of carefully crafted neogen hoax species throughout the current STC and surrounding volumes. Uses fast reactionless ships to arrive at habitable but lifeless planets, and quickly sets up a fake ecology and culture there.
The frauds promulgated by Progenitor Lord have been detected on many occasions, but E appears to think this is all part of the fun.