- A genus of trilobites based in the Silurian and Devonian structures. Phacops bufo the most common species.
- A genus of trilo-bites typical associated with proparian family Phacopidæ, with elliptical or oval carapaces, semicircular cephala with curved genal sides, anterior horizontal lobes fused aided by the frontal lobe to make a big swollen cranidium, and paid down posterior horizontal lobes. The eyes tend to be big, prominent, and schizochroal, the pleura rounded, additionally the pygidium semicircular with whole margin. The genus ranges through the Silurian to your Upper Devonian.