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Placoderms appeared in the fossil register during the Silurian period, and all placoderms (including the nightmarish Dunkleosteus terrelli) went extinct on the Late Devonian extinction.
On the Carboniferous period there were already no placoderm fishes in the oceans.
This Paleozoic era extinction(s) is not yet fully understood.
However, the extinction of many marine life families in the Devonian/Carboniferous mass extinction, during the Frasnian/Famennian stages and specially the Kellwasser event, was due to the widespread oceanic anoxia.
Few other reliable paleontologic data is known.
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What are the comparison between ostracoderms and the placoderms?
They're both extinct bony fishes. The difference is that ostracoderms were jaw-less and placoderms had jaws.
Where did fish come from?
Fish do not come from one source or one event. Early fish were small, jawless species that are now extinct. The first fish with jaws were Placoderms.
What animal did the jaw evolve from?
placoderms (an ancient jawed fish)
What is a sentence with the word extinct?
Why did the dinosaurs go extinct? Humans will never go extinct!
Why did Missouri go extinct?
Missouri is a state - it is not a living thing so it cannot go extinct.
When did proboscis monkeys go extinct?
they are not extinct yet.
When did wild silk worms go extinct?
They are not extinct...
How did the mountain lion go extinct?
It has NEVER been extinct.
What is a chimpanzee expected to go extinct?
They are not expected to become extinct.
Why didn't hippos go extinct?
hippos didn't go extinct because they are still producing
What will happen if the Jamaican iguanas go extinct?
if they go extinct then the things that they eat will get over populated.
How did Hector dolphins go extinct?
The hectors dolphin did not go extinct you may be thinking of the baiji river dolphin witch went extinct in 2006.
