Agnostida

Pseudagnostus rugosus

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Diplagnostidae

Cambrian, Furongian Jiangshanian to Stage 10Hunan, Zhejiang; Kazakhstan, Sweden

Pseudagnostus rugosus — photo 1 — Photo 1 · (Kazakhstan; Yergaliev et al., 2013) (Zhejiang; Peng Shanchi (Hunan; Peng Shanchi 2020) 2020) Illustrated specimens (Sweden; Terfelt et al., Complete dorsal 2010) shield (Zhejiang; strongZJU)

Pseudagnostus rugosus — photo 2 — Photo 2 · (Kazakhstan; Yergaliev et al., 2013) (Zhejiang; Peng Shanchi (Hunan; Peng Shanchi 2020) 2020) Illustrated specimens (Sweden; Terfelt et al., Complete dorsal 2010) shield (Zhejiang; strongZJU)

Pseudagnostus rugosus — photo 3 — Photo 3 · (Kazakhstan; Yergaliev et al., 2013) (Zhejiang; Peng Shanchi (Hunan; Peng Shanchi 2020) 2020) Illustrated specimens (Sweden; Terfelt et al., Complete dorsal 2010) shield (Zhejiang; strongZJU)

Pseudagnostus rugosus — photo 4 — Photo 4 · (Kazakhstan; Yergaliev et al., 2013) (Zhejiang; Peng Shanchi (Hunan; Peng Shanchi 2020) 2020) Illustrated specimens (Sweden; Terfelt et al., Complete dorsal 2010) shield (Zhejiang; strongZJU)

Pseudagnostus rugosus — photo 5 — Photo 5 · (Kazakhstan; Yergaliev et al., 2013) (Zhejiang; Peng Shanchi (Hunan; Peng Shanchi 2020) 2020) Illustrated specimens (Sweden; Terfelt et al., Complete dorsal 2010) shield (Zhejiang; strongZJU)

Pseudagnostus rugosus — photo 6 — Photo 6 · (Kazakhstan; Yergaliev et al., 2013) (Zhejiang; Peng Shanchi (Hunan; Peng Shanchi 2020) 2020) Illustrated specimens (Sweden; Terfelt et al., Complete dorsal 2010) shield (Zhejiang; strongZJU)

Classification

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Diplagnostidae

Genus

Pseudagnostus Jaekel, 1909

Genus author

Jaekel O.

Genus etymology

pseud-, Greek, false; Agnostus, a trilobite genus name.

Species

P. rugosus (Eargaliev, 1980)

Species author

Eragaliev G. K.

Species etymology

rugosus, wrinkled.

Age

Cambrian, Furongian Jiangshanian to Stage 10

Distribution

Hunan, Zhejiang; Kazakhstan, Sweden

Synonyms

Pseudagnostus(Sulcatagnostus)rugosus; Pseudagnostus(Pseudagnostus)rugosus; Sulcatagnostus rugosus

Diagnosis

Cheek of cephalon and pleural region of pygidium with dense radiating striae; border and border furrow both broad. F3 of glabella slightly arched downward medially, F2 inverted V-shaped; preglabellar median furrow deep; basal lobe triangular. Anterior lobe of pygidial axis narrow, posterior lobe broad, anterior end with a pair of swellings beside the axial node, some specimens showing two rows of pits medially.

Remarks

The type specimen is from Kazakhstan, not yet verified. The complete dorsal shield of this species was first discovered by the enthusiast strongZJU.