This sea remained in place during the early Paleozoic era and would come to be inhabited by creatures like brachiopods, ostracoderms, and trilobites.
12.
It was long assumed that pteraspidomorphs and thelodonts were the only ostracoderms with paired nostrils, while the other groups have just a single median nostril.
13.
In 1890 paleontologist Charles D . Walcott found broken pieces of the bony plates embedded in the skin of Middle Ordovician jawless fish known as ostracoderms.
14.
The ostracoderm armour consisted of 3 5 mm polygonal plates that shielded the head and gills, and then overlapped further down the body like scales.
15.
The evidence of phylogeny, however, suggests the lamprey lineage diverged much earlier from other vertebrates, rather than arising from among the " ostracoderms ".
16.
It is now accepted that the precursors of the jawed vertebrates are the long extinct bony ( armoured ) jawless fish, the so-called ostracoderms.
17.
After the appearance of jawed fish, most ostracoderm species underwent a decline, and the last ostracoderms became extinct at the end of the Devonian period.
18.
After the appearance of jawed fish, most ostracoderm species underwent a decline, and the last ostracoderms became extinct at the end of the Devonian period.
19.
Other fossils found alongside the ostracoderms lived articulated brachiopods, conodonts, gastropods, ostracods, pelecypods, sponges, trilobites, and trace fossils left by worms.
20.
These characteristics are, however, likely to be general for either the vertebrates or, at any rate, for the ensemble of all ostracoderms and the gnathostomes.
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