These authentic Paralejurus trilobites come from the fossil-rich Devonian strata near Alnif, Morocco, a region world-renowned for its beautifully preserved trilobite fauna. Belonging to the order Proetida, Paralejurus is easily recognized by its smooth, streamlined exoskeleton and large, rounded pygidium, giving it a more oval and polished appearance compared to spiny or segmented genera.

Unlike many trilobites with ornate surface textures, Paralejurus evolved a simpler, hydrodynamic form suited to life on or just beneath the seafloor. It likely scavenged or sifted through sediment in calm, shallow seas that once covered the Anti-Atlas region. These trilobites often have well preserved holochoral eyes, composed of dozens of near-microscopic lenses.