Phacopidella trapeziceps trilobite cephalon of Ludlow age - Silurian, collected in Kozolupy, Czechoslovakia. Phacopidella trapeziceps is a species of trilobite under the family Phacopidae. Phacops are known for having large eyes in comparison to their body and this particular species was believed to have fed on detritus. Only the cephalon has been preserved in this example and it is held within a limestone matrix. The cephalon is small, 0.6 cm x 0.7 cm and is supplied in a small plastic bag with an information label.