When Were Placoderms Invented?
The Earliest Jawed Vertebrates Probably Developed During the Late Ordovician Period. They Are First Represented in the Fossil Record from the Silurian by Two...
The earliest jawed vertebrates probably developed during the late Ordovician period. They are first represented in the fossil record from the Silurian by two groups of fish: the armoured fish known as placoderms, which evolved from the ostracoderms; and the Acanthodii (or spiny sharks).
When did the first placoderms appear?
Placoderms existed throughout the Devonian Period (about 416 million to 359 million years ago), but only two species persisted into the succeeding Carboniferous Period. During the Devonian they were a dominant group, occurring in all continents except South America in a variety of marine and freshwater sediments.
When did the first fish appear on Earth?
The first fish appeared around 530 million years ago and then underwent a long period of evolution so that, today, they are by far the most diverse group of vertebrates.
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