List The four Common Features Of Placoderms
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Placoderm, any member of an extinct group (Placodermi) of primitive jawed fishes known only from fossil remains. 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.
fish: Placodermi: plate-skin fishes
The first record of the jawed Placodermi is from the Early Devonian, about 400 million years ago. The placoderms flourished…
Most placoderms were small or moderate in size, but a few may have reached a length of 13 feet (4 metres). The name is derived from their characteristic armour of dermal, or skin, bones. This armour formed a head shield and a trunk shield, the two commonly connected by a paired joint in the neck region. The arrangement of bones is so different from that of modern fishes with bony skeletons that it is unlikely that the bones of the two groups are homologous (similar in origin).
The earliest placoderms were heavily armoured and were bottom-dwelling. Many later forms became highly specialized for this way of life
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