Xenobiology

Abiogenesis,  Lithopanspermia and Translocation -the origin of life in planetary environments

Chlorine worlds - Chlorine worlds are like typical Eugaian worlds, with one important difference: the process of photosynthesis releases free chlorine.

Cookie Fiend - predator from the world Elmo

Honeywhip Carnivorous arboreal predator from the planet Trees

Puffer Patch - a small predator native to Ridgewell, that spends most of its life in a sessile state, but is capable of using metamorphosis to change to a mobile form when environmental conditions require it.

Pspyder - Colony lifeform native to the planet Trees

To'ul'hian worlds - To'ul'hian worlds are an unusual variety of world named after the most famous of them, the homeworld of the To'ul'h. They might be regarded as a cool and wet version of the Cytherean type, or as very hot high-pressure Gaian worlds.

Xenobiochemistry - the many different forms of biology found so far on alien worlds

Xenophotosynthesis - Oxygen and Alternatives