Ptychopariida

Shuizuia laevigata

Order Ptychopariida / Suborder Ptychopariina / Superfamily Ptychoparioidea / Family Kingstoniidae

Stage 10 (Furongian, Cambrian)Guizhou, Guangxi

Shuizuia laevigata — photo 1 — Photo 1 · of this genus are from the Sandu Shui Autonomous County of Guizhou. Holotype NIGP 104355 (Guizhou; Peng 2020) Complete dorsal exoskeleton (Guangxi; Lixia) (Guizhou; Peng 2020)

Shuizuia laevigata — photo 2 — Photo 2 · of this genus are from the Sandu Shui Autonomous County of Guizhou. Holotype NIGP 104355 (Guizhou; Peng 2020) Complete dorsal exoskeleton (Guangxi; Lixia) (Guizhou; Peng 2020)

Shuizuia laevigata — photo 3 — Photo 3 · of this genus are from the Sandu Shui Autonomous County of Guizhou. Holotype NIGP 104355 (Guizhou; Peng 2020) Complete dorsal exoskeleton (Guangxi; Lixia) (Guizhou; Peng 2020)

Classification

Order Ptychopariida / Suborder Ptychopariina / Superfamily Ptychoparioidea / Family Kingstoniidae

Genus

Shuizuia Lu & Zhou, 1990

Genus author

Lu Yanhao & Zhou Tianrong

Genus etymology

Shuizu, the Shui (Shuizu) ethnic group, one of China's ethnic minorities. The type specimens of the type species

Species

S. laevigata Lu & Zhou, 1990

Species author

Lu Yanhao & Zhou Tianrong

Species etymology

laevigata, Latin, smooth

Age

Stage 10 (Furongian, Cambrian)

Distribution

Guizhou, Guangxi

Diagnosis

Cranidium subtriangular with rounded or broadly rounded anterior margin; dorsal furrows shallow, developed only in the posterior half; glabella convergent posteriorly, glabellar furrows indistinct; occipital furrow extremely shallow or absent; palpebral lobes small; librigenae narrow. Thorax of 7 segments; axis wider than pleurae; pleural lobes strongly deflected downward laterally. Pygidium semicircular, as large as the cephalon; axis narrow and long, moderately convex, segmentation indistinct; pleural region smooth, border absent.

Remarks

This species is the type species of the genus Shuizuia.