Agnostida

Ptychagnostus leptus

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Ptychagnostidae

Cambrian, Miaolingian, DrumianAnhui, Hunan; North America

Ptychagnostus leptus — photo 1 — Photo 1 · Holotype (Anhui; Peng et al., 2000) Illustrated specimens (Hunan; Peng (Zhejiang; strongZJU) Shanchi 2020) Illustrated specimens (USA; Robinson 1984)

Ptychagnostus leptus — photo 2 — Photo 2 · Holotype (Anhui; Peng et al., 2000) Illustrated specimens (Hunan; Peng (Zhejiang; strongZJU) Shanchi 2020) Illustrated specimens (USA; Robinson 1984)

Ptychagnostus leptus — photo 3 — Photo 3 · Holotype (Anhui; Peng et al., 2000) Illustrated specimens (Hunan; Peng (Zhejiang; strongZJU) Shanchi 2020) Illustrated specimens (USA; Robinson 1984)

Ptychagnostus leptus — photo 4 — Photo 4 · Holotype (Anhui; Peng et al., 2000) Illustrated specimens (Hunan; Peng (Zhejiang; strongZJU) Shanchi 2020) Illustrated specimens (USA; Robinson 1984)

Classification

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Ptychagnostidae

Genus

Ptychagnostus Jaekel, 1909

Genus author

Jaekel O.

Genus etymology

ptych-, Greek, fold; Agnostus, a trilobite genus name.

Species

P. leptus Qian in Qiu et al., 1983

Species author

Qian Yiyuan

Species etymology

lept-, slender, thin.

Age

Cambrian, Miaolingian, Drumian

Distribution

Anhui, Hunan; North America

Synonyms

Ptychagnostus michaeli; Acidusus? michaeli

Diagnosis

This species closely resembles Ptychagnostus cuyanus, but its glabellar median node is slightly more anterior, furrows are deeper, and the cephalic posterolateral spines, the axial spine of the 2nd thoracic segment and the pygidial posterolateral spines are all longer.