Phylogenetic studies have resolved Radiodonta (also known as anomalocaridids) as the closest group to all euarthropods that have frontalmost appendages on the second head segment (Deuteropoda)5–9 .

Radiodonta were one of the earliest animal types to emerge on Earth Until recently, little was known about the strange creatures' eyes Now, experts have revealed how their eyes gave them an edge ...

T. gainesi appeared to have a series of flaps along its body that helped it zoom through open water and a massive head carapace that indicated it was a hurdiid, a helmeted family in the radiodonta ...