Asaphida

Sagavia chuanxiensis

Order Asaphida / Superfamily Cyclopygoidea / Family Cyclopygidae

Katian (Late Ordovician)Sichuan, Shaanxi

Sagavia chuanxiensis — photo 1 — Photo 1 · Holotype S82-001 (Sichuan; Li Shanji et al. 1984) Complete enrolled dorsal exoskeleton NIGP131880 (Shaanxi; photograph courtesy of Prof. Zhou Zhiqiang)

Sagavia chuanxiensis — photo 2 — Photo 2 · Holotype S82-001 (Sichuan; Li Shanji et al. 1984) Complete enrolled dorsal exoskeleton NIGP131880 (Shaanxi; photograph courtesy of Prof. Zhou Zhiqiang)

Classification

Order Asaphida / Superfamily Cyclopygoidea / Family Cyclopygidae

Genus

Sagavia Koroleva, 1967

Genus author

Koroleva M. N.

Genus etymology

Possibly from the Saga Formation at the Saga River section in Kazakhstan, the type locality

Species

S. chuanxiensis (Li & Xiao, 1984)

Species author

Li Shanji, Xiao Xingming

Species etymology

Chuanxi, western Sichuan, the locality

Age

Katian (Late Ordovician)

Distribution

Sichuan, Shaanxi

Synonyms

Microparia (Microparia) Chuanxiensis

Diagnosis

Cephalon strongly convex, subsemi-elliptical; glabella swollen, longitudinally elongate, with parallel sides in the posterior two-thirds, then converging forward, anterior part strongly bent downward; a prominent median node at the middle of the glabella; palpebral lobes narrow, band-like; eyes large and convex, elongate, not connected anteriorly, ovate in lateral view and subsemi-elliptical in dorsal view, each eye of about 2000 polygonal lenses. Thorax of five segments; axis wider than pleurae, strongly convex, gently tapering backward. Pygidium semi-elliptical; axis conical, gently convex, of 3 axial rings plus a terminal piece; postaxial ridge prominent; pleural ridges visible in some specimens; border furrow narrow; border narrow.