''Tesseraspis'' is a Lowermost Devonian fish characteristic of the ''

Traquairaspis ''Traquairaspis'' is a genus of extinct heterostracan agnathan fish known from the Silurian and Early Devonian periods. It is predominantly known from Late Silurian fluvial deposits from Wales and England: some species were also found in shallo ...

'' Fish Zone.

References

Heterostraci genera Devonian jawless fish Fossils of Russia {{Pteraspidomorphi-stub