Introduction to Extinct Fauna

Sagan 4 is home to many groups of fauna both living and extinct, and for a newcomer just starting to explore its diverse array of biota, knowing where to start can be difficult. Extant groups are introduced in the Introduction to Extant Fauna, however Sagan 4 also has many extinct groups worth covering.

This page includes both natural clades and evolutionary grades.

Up to GRB
These organisms became extinct either before, during, or shortly after the gamma ray burst in generation 100.

Up to Ice Comet
These organisms were still kicking after the gamma ray burst, but died out before, as a result of, or shortly after the ice comet impact event.

Through the Ice Age
The ice age was a major geologic period in its own right, lasting 37.5 million years with a whopping 12.5 million year snowball event in its center, resulting in the extinction of countless groups that had made it through the previous extinction events.

Post-Ice Age
These organisms died out after the ice age for some reason or another, mostly habitat loss from shrinking polar regions and rising sea levels.