Cephalaspis ("Shield head") swam - very slowly - in the Devonian estuaries of what is now Strathmore. Cephy was a jawless fish like Jamy, about the size of a trout: unlike Jamy, however, it had an impressive plow-like shield on its head. This was likely an adaptation for multiple uses: for calcium storage in low-calcium environments; to shovel dirt, silt, and sand out of the way as it hoovered up algae and worms; and, most ominously, as a defense against the gigantic sea-scorpions which menaced Scottish seas in this time.
Cephalaspis has the unfortunate luck to be a "wastebasket taxon": if remains from a jawless fish are too fragmentary or inconclusive for diagnosis, they tend to be assigned to Cephalaspis out of convenience. There are thus dozen of Cephy species all around the world, a number which will probably grow in the years to come.
Cephy might look familiar to documentary watchers: it appeared in a starring role on "Walking With Monsters," the underrated prequel to "Walking With Dinosaurs," along with some of terrifying predators - who will receive their own PrehiScotInktoberfest soonly...
"Wait, whit he say aboot terrifying predators?"
"Dinnae ken, bit ahm naw waitin' tae find oot!"