|“||Meet Brontoscorpio. His kind may look like modern scorpions, but they're a meter long monster scorpion with gills, a superior armory to Anomalocaris, and a stinger the size of a light-bulb.||„|
|— Allen, about Brontoscorpio|
Brontoscorpio ("Thunder Scorpion") was a large prehistoric, armored, sea scorpion arthopod that lived during the late Silurian period.
Brontoscorpio lived during the Silurian period from 440-417 million years ago alongside Cameroceras, Cephalaspis, and Pterygotus. As one of the sea scorpions, Brontoscorpio was one of the top predators in the Silurian seas.
Brontoscorpio measured about meter long and had gills, body armor stronger than Anomalocaris, a light-bulb sized stinger on its tail, and was among the smallest sea scorpion. But however, they could step onto dry land, as they were among the first creatures to do so, and they had a huge advantage. In addition to gills, Brontoscorpio also had simple lungs made up of hundreds of thin layers of tissue. Being unable to breathe in and out like humans do, Brontoscorpio only absorbed oxygen into their blood stream.
Equipped to maximize oxygen, and with their armor to protect them from the sun, these sea scorpions often patrolled the shorelines, scavenging on whatever the seas washed up. However, there were times where some Brontoscorpio couldn't feed because they often became prisoners in their own skin. Their rigid skeletons became a handicap and thus, it couldn't grow with their bodies. They needed to shed their hard skin, and then grow another, expanding while the new one is still soft. For such a large creature, this was a long process.
As one of the sea scorpions, Brontoscorpio was one of the top predators of the Silurian Seas and prey was plentiful in their seabed hunting ground. Whenever they were on land, Brontoscorpio patrolled the shorelines, scavenging on any carcass that came from the sea. Surprisingly, these sea arthropods also lived in large numbers.