Phacopida

Prosopiscus latus

Order Phacopida / Suborder Phacopina / Superfamily Dalmanitoidea / Family Prosopiscidae

Dapingian to Darriwilian (Middle Ordovician)Guizhou

Prosopiscus latus — photo 1 — Photo 1 · Holotype 21544 (Guizhou; Lu Yanhao et al. 1974)

Classification

Order Phacopida / Suborder Phacopina / Superfamily Dalmanitoidea / Family Prosopiscidae

Genus

Prosopiscus Salter in Salter and Blanford, 1865

Genus author

Salter J. W.

Genus etymology

prosop-, Greek, face, mask; -iscus, a diminutive ending

Species

P. latus Lu in Lu & Zhang, 1974

Species author

Lu Yanhao

Species etymology

latus, wide, broad

Age

Dapingian to Darriwilian (Middle Ordovician)

Distribution

Guizhou

Diagnosis

Cephalon wide, subsemi-elliptical; anterior border arcuate; glabella with subparallel sides, anterior lobe constricted forward, three pairs of glabellar furrows; eyes and facial sutures absent; cheek border furrows wide and deep, genal angles rounded, extending beyond the cheeks. Thorax of 10 segments; axis narrower than pleurae; pleural furrows deep. Pygidium triangular; axis triangular, of 4-5 rings; with shallow pleural and interpleural furrows.