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Sponge
Apex predator(s) of the Paleozoic
Anomalocaris
Apex predator(s) of the Cambrian
Trilobites
Index fossil of the Cambrian
Treptichnus pedum
Trace fossil of the Cambrian
Nautiloids and Seastars
Apex predator(s) of the Ordovician
Graptolites and Conodonts
Index fossil of the Ordovician
Eurypterids (sea scorpions) and Nautiloids
Apex predator(s) of the Silurian
Dunkleosteus/Placoderm
Apex predator(s) of the Devonian
Fusilinids
Index fossil of the Penn-Permian
Synapsid
Reptile that dominated the Permian