Bios:Mesofauna 2nd edition starts with the invasion of the land about 450 million years ago and is an Alternate 2nd Game in the Bios Trilogy. It follows the same sort of Achterbahn environment, same climate change, same or similar creeples, same VP, same tiles, same card colors, same cratons and drift, same basic and Achterbahn games, same catastrophes, same greenhouse, cloudiness, and oxygen. Same terrestrial settings. All of these are production and development advantages. The setting is the same, only the animals are smaller. 

Start with an archetype species, and evolve into up to 6 more swimming, flying, burrowing, armored, or parasite species.

Build a portrait of each species that gives you victory points according to its pheromones and population. 

Use a diceless contest mechanic to see which carnivore, herbivore, or parasite is the fittest to survive in a particular pollinator, herbivore, or carnivore niche