Eophrynus prestvicii is an extinct species of arachnid belonging to the order Trigonotarbida.

The first trigonotarbid was described in 1837 from the Coal Measures of Coalbrookdale in England by the famous English geologist Dean William Buckland.

Recent x-ray imaging revealed that Eophrynus prestvicii were covered by protective spikes on the back-half of its body.

[4] Scientists at Imperial College London created a detailed 3D computer model of the arachnid from fossils.

[5][6] This species is known from a handful of good quality fossils preserved inside siderite concretions.