It is a prehistoric bug that is mostly closely related to the arachnids of today. I lacks a spinneret though. It is one of the first trigonotarbids to ever be described. (It looks like a spiky tick. Seriously)
Eophrynus prestvicii is an extinct specie of arachnid belonging to the order Trigonotarbida. Its a spider-shape animal. Phylum is Arthropoda. Genus is Eophrynus.
