Eldredgeops rana

Order Phacopida / Suborder Phacopina / Superfamily Phacopoidea / Family Phacopidae

Eldredge, the palaeontologist Niles Eldredge, who made many studies of phacopid trilobites

rana, a frog, referring to the cephalon, which in frontal view strongly resembles a frog, especially with its pair of large eyes

Calymene bufo var. rana; Phacops rana

Cephalon semicircular; glabella flatly convex, covered with dense low rounded nodes, widening transversely anteriorly; first pair of lateral glabellar furrows deeply impressed, anterior glabellar furrows faint or absent; anterior occipital ring with a large median node; occipital ring longitudinally long; dorsal furrows deep; eyes large, close to the glabella, with 15 to 18 rows of lenses; genal angles rounded. Thorax of 11 segments; axis slightly narrower than pleurae. Pygidium with 7 to 10 axial rings and 6-7 pleural ribs; border absent.

This species is the state fossil of Pennsylvania, USA.