Phacopida

Prosopiscus sp.

Order Phacopida / Suborder Phacopina / Superfamily Dalmanitoidea / Family Prosopiscidae

Darriwilian (Middle Ordovician)Shandong

Prosopiscus sp. — photo 1 — Photo 1 · Complete dorsal exoskeleton (Shandong; Mingqing)

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

Prosopiscus sp.

Species author

Species etymology

Age

Darriwilian (Middle Ordovician)

Distribution

Shandong

Diagnosis

Cephalon wide; anterior border rather flat; glabella with parallel sides and three pairs of glabellar furrows, S1 and S2 rather straight, S3 oblique; occipital ring of uniform width; occipital furrow disconnected medially; eyes and facial sutures absent; cheek border furrows wide and shallow, genal angles rounded, extending beyond the cheeks. Thorax of 10 segments; axis subequal in width to pleurae; pleural furrows deep. Pygidium subtriangular; axis triangular, of 4-5 rings; pleural and interpleural furrows distinct; border medium-wide.