Polybranchiaspis 
Devonian period
Furcacauda
Devonian period
Silurian period
Silurian period
Silurian period
The actual sacabambaspis is closer to this.
A model from the Natural History Museum of Helsinki in Finland.
Illustration: Kota
(Jawless fish)
Sacabambaspis lived during the Ordovician period, about 485 million years ago.
Long tail.
Drepanaspis
Devonian period
Doryaspis
Devonian period
Pteraspis
Devonian period
Cephalaspis
Devonian period
Pharyngolepis
Silurian period
We are agnatha!
Conodont
Ordovician period
Astraspis
Ordovician period
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