Here's a reference sheet of the Ceilonis. :3 It's not super detailed, but hopefully is informative enough. xD

The Ceilonis are a closed species, and can only be obtained through adoptables that I or Inanagi create.

Originally they were part of the Plain of Aetherius, but I've not combined that place with Sanctuary, so the Plains are a canon location on the planet. :3 All species that were in the Plains are now native to Sanctuary.