Ostracoderms existed in two major groups, the more primitive cephalaspids.
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This allowed placoderms to lift their heads, unlike ostracoderms.
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The first fossil fishes that were discovered were ostracoderms.
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Ostracoderms have heads covered with a bony shield.
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Other ostracoderms, such as the Galeaspida are now known to have a paired olfactory organ.
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Later, about 420 million years ago, the jawed fish evolved from one of the ostracoderms.
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Early fish from the fossil record are represented by a group of small, jawless, armored fish known as ostracoderms.
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Like other ostracoderms, " Ateleaspis " had a head shield similar to that of " Cephalaspis ".
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Current phylogenetic analysis using a large number of characteristics now place pteraspidomorphs as the sister-group of all other ostracoderms and the gnathostomes.
10.
One of the earliest known armoured agnathan ( " ostracoderm " ) vertebrate, " Arandaspis ", dates from the Middle Ordovician.
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