Agnostida

Neoagnostus quadratiformisus

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Diplagnostidae

Cambrian, Furongian Jiangshanian to Stage 10Zhejiang, Guangxi; Kazakhstan

Neoagnostus quadratiformisus — photo 1 — Photo 1 · Illustrated specimens (Zhejiang; Peng Shanchi 2020) (Guangxi; Baishui) (Guangxi; Lixia)

Neoagnostus quadratiformisus — photo 2 — Photo 2 · Illustrated specimens (Zhejiang; Peng Shanchi 2020) (Guangxi; Baishui) (Guangxi; Lixia)

Neoagnostus quadratiformisus — photo 3 — Photo 3 · Illustrated specimens (Zhejiang; Peng Shanchi 2020) (Guangxi; Baishui) (Guangxi; Lixia)

Classification

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Diplagnostidae

Genus

Neoagnostus Kobayashi, 1955

Genus author

Kobayashi T.

Genus etymology

neo-, Latin, new; Agnostus, a trilobite genus name.

Species

N. quadratiformisus Ergaliev, 1980

Species author

Ergaliev G. Kh.

Species etymology

quadrat-, Latin, square; form-, Latin, shape, form, appearance, nature.

Age

Cambrian, Furongian Jiangshanian to Stage 10

Distribution

Zhejiang, Guangxi; Kazakhstan

Diagnosis

Cephalon square, wider above; glabella weakly convex cylindrical, anterior end broadly rounded, with small node medially, furrows effaced; basal lobe triangular; dorsal furrow distinct; border and border furrow Relatively broad. Thoracic segments narrow; axis tripartite. Pygidium square, narrower above; pygidial axis short, inverted-trapezoidal, median node short; terminal node of pseudolobe distinct; border broad; lateral border furrows narrow, widest medially; with a pair of lateral marginal spines.

Remarks

The Jiangshan, Zhejiang specimen is an early Stage 10 limestone specimen, and the Guole, Guangxi specimen is a latest Jiangshanian shale specimen; excluding preservational factors, their characters are completely identical, so they are regarded as conspecific.