Agnostida

Ptychagnostus punctuosus

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Ptychagnostidae

Cambrian, Miaolingian, DrumianHunan, Xinjiang; Europe, North America, Australia

Ptychagnostus punctuosus — photo 1 — Photo 1 · Type specimens (cephalon is Illustrated specimens PMO Illustrated specimens KUMIP Illustrated specimens NFM the lectotype) 212.012 204272 F-1362 (Sweden; Westergård 1946) (Norway; Høyberget et al., 2008) (USA; Robison 1984) (Canada; Hildenbrand et al., 2021) Illustrated specimens NIGP 124082-124085 (Hunan; Peng Shanchi T1637-38 (Xinjiang; Xiang Liwen et CPC14190 (Australia; Laurie 1988) 2020) al. 1985)

Ptychagnostus punctuosus — photo 2 — Photo 2 · Type specimens (cephalon is Illustrated specimens PMO Illustrated specimens KUMIP Illustrated specimens NFM the lectotype) 212.012 204272 F-1362 (Sweden; Westergård 1946) (Norway; Høyberget et al., 2008) (USA; Robison 1984) (Canada; Hildenbrand et al., 2021) Illustrated specimens NIGP 124082-124085 (Hunan; Peng Shanchi T1637-38 (Xinjiang; Xiang Liwen et CPC14190 (Australia; Laurie 1988) 2020) al. 1985)

Ptychagnostus punctuosus — photo 3 — Photo 3 · Type specimens (cephalon is Illustrated specimens PMO Illustrated specimens KUMIP Illustrated specimens NFM the lectotype) 212.012 204272 F-1362 (Sweden; Westergård 1946) (Norway; Høyberget et al., 2008) (USA; Robison 1984) (Canada; Hildenbrand et al., 2021) Illustrated specimens NIGP 124082-124085 (Hunan; Peng Shanchi T1637-38 (Xinjiang; Xiang Liwen et CPC14190 (Australia; Laurie 1988) 2020) al. 1985)

Ptychagnostus punctuosus — photo 4 — Photo 4 · Type specimens (cephalon is Illustrated specimens PMO Illustrated specimens KUMIP Illustrated specimens NFM the lectotype) 212.012 204272 F-1362 (Sweden; Westergård 1946) (Norway; Høyberget et al., 2008) (USA; Robison 1984) (Canada; Hildenbrand et al., 2021) Illustrated specimens NIGP 124082-124085 (Hunan; Peng Shanchi T1637-38 (Xinjiang; Xiang Liwen et CPC14190 (Australia; Laurie 1988) 2020) al. 1985)

Ptychagnostus punctuosus — photo 5 — Photo 5 · Type specimens (cephalon is Illustrated specimens PMO Illustrated specimens KUMIP Illustrated specimens NFM the lectotype) 212.012 204272 F-1362 (Sweden; Westergård 1946) (Norway; Høyberget et al., 2008) (USA; Robison 1984) (Canada; Hildenbrand et al., 2021) Illustrated specimens NIGP 124082-124085 (Hunan; Peng Shanchi T1637-38 (Xinjiang; Xiang Liwen et CPC14190 (Australia; Laurie 1988) 2020) al. 1985)

Ptychagnostus punctuosus — photo 6 — Photo 6 · Type specimens (cephalon is Illustrated specimens PMO Illustrated specimens KUMIP Illustrated specimens NFM the lectotype) 212.012 204272 F-1362 (Sweden; Westergård 1946) (Norway; Høyberget et al., 2008) (USA; Robison 1984) (Canada; Hildenbrand et al., 2021) Illustrated specimens NIGP 124082-124085 (Hunan; Peng Shanchi T1637-38 (Xinjiang; Xiang Liwen et CPC14190 (Australia; Laurie 1988) 2020) al. 1985)

Ptychagnostus punctuosus — photo 7 — Photo 7 · Type specimens (cephalon is Illustrated specimens PMO Illustrated specimens KUMIP Illustrated specimens NFM the lectotype) 212.012 204272 F-1362 (Sweden; Westergård 1946) (Norway; Høyberget et al., 2008) (USA; Robison 1984) (Canada; Hildenbrand et al., 2021) Illustrated specimens NIGP 124082-124085 (Hunan; Peng Shanchi T1637-38 (Xinjiang; Xiang Liwen et CPC14190 (Australia; Laurie 1988) 2020) al. 1985)

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. punctuosus (Angelin, 1851)

Species author

Angelin N. P.

Species etymology

punct-, Latin, punctured, spotted.

Age

Cambrian, Miaolingian, Drumian

Distribution

Hunan, Xinjiang; Europe, North America, Australia

Synonyms

Agnostus punctuosus; Ptychagnostus(Ptychagnostus)punctuosus; Ptychagnostus punctuosus fermexilis; P. punctuosus punctuosus

Diagnosis

Cephalon semicircular, covered with radiating furrows and large nodes; preglabellar median furrow present; glabellar frontal lobe triangular, axial area with slender anterior pit, median node at about the anterior third of the posterior lobe; basal lobe elongate and narrow; border and border furrow both narrow. Pygidium semicircular, covered with nodes; axis broad, divided into three rings, middle ring hexagonal; postaxial median furrow present; no lateral spines.

Remarks

This species is the type species of Ptychagnostus.