""'Ateleaspis " "'is an extinct genus of primitive ostracoderm fish that lived in the Early Silurian to Early Devonian periods.
22.
Among vertebrates, jawless armoured fish ( ostracoderms ) declined in diversity, while the jawed fish ( gnathostomes ) simultaneously increased in both the sea and fresh water.
23.
Most of the ostracoderms, such as thelodonts, osteostracans, and galeaspids, were more closely related to the gnathostomes than to the surviving agnathans, known as cyclostomes.
24.
Among vertebrates, jaw-less armored fish ( ostracoderms ) declined in diversity, while the jawed fish ( gnathostomes ) simultaneously increased in both the sea and fresh water.
25.
It was long thought that the first true vertebrates ( fish Ostracoderms ) appeared in the Ordovician, but recent discoveries in China reveal that they probably originated in the Early Cambrian.
26.
During the Middle Devonian 393 383 Ma, the armoured jawless ostracoderm fishes were declining in diversity; the jawed fish were thriving and increasing in diversity in both the oceans and freshwater.
27.
Many of the oldest fossil vertebrates, including ostracoderms, placoderms, crossopterygians, and even early tetrapods, had a socket in the skull that appears to have held a functional third eye.
28.
He compared them at first with extant armored fish such as catfish and sturgeons but later realizing that they had no movable jaws, classified them in 1844 into a new group " ostracoderms ".
29.
He wrote accounts of new ostracoderm fishes from the late Silurian and Devonian, and became a particular specialist on terrestrial arthropods, notably with delicate dissections and interpretations of fossilized Triassic scorpions and Carboniferous eurypterids.
30.
More recent research indicates, however, that fish with jaws had far less to do with the extinction of the ostracoderms than previously assumed, as they coexisted without noticeable decline for about 30 million years.
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