| Bryozoans |
| Brachiopods |
| Sponges |
| Mollusks |
| Forams |
| Echinoderms |
| Cephalopods |
| Arthropods |
| Corals |
| Change in Diversity of Invertebrates from the Permian Through the Middle Triassic |
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The Permian-Triassic
Extinction Event was the
Largest Extinction Event in
the History of the Earth
Extinction Event was the
Largest Extinction Event in
the History of the Earth
 |  |
Diversity Information from Erwin
(1993), The Great Paleozoic Crisis
(1993), The Great Paleozoic Crisis
Some Links for
Further Reading about
the Permian-Triassic
Extinction Event
Further Reading about
the Permian-Triassic
Extinction Event