Agnostida

Ptychagnostus cuyanus

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Ptychagnostidae

Cambrian, Miaolingian, DrumianHunan, Zhejiang; Argentina, USA, Australia
Ptychagnostus cuyanus — photo 1
Photo 1 · KUMIP 204226-228 Cephalon holotype MCNAM Recons 2643 tructio n (Argentina; Tortello et al., 1997) (USA; Robison 1984) (drawn by Haixiang) CPC 14251 (Australia; Öpik 1979) 2 mm (Zhejiang; Baishui) Complete dorsal shield (USA; Complete dorsal shield (USA; Baishui) Tang Shi)
Ptychagnostus cuyanus — photo 2
Photo 2 · KUMIP 204226-228 Cephalon holotype MCNAM Recons 2643 tructio n (Argentina; Tortello et al., 1997) (USA; Robison 1984) (drawn by Haixiang) CPC 14251 (Australia; Öpik 1979) 2 mm (Zhejiang; Baishui) Complete dorsal shield (USA; Complete dorsal shield (USA; Baishui) Tang Shi)
Ptychagnostus cuyanus — photo 3
Photo 3 · KUMIP 204226-228 Cephalon holotype MCNAM Recons 2643 tructio n (Argentina; Tortello et al., 1997) (USA; Robison 1984) (drawn by Haixiang) CPC 14251 (Australia; Öpik 1979) 2 mm (Zhejiang; Baishui) Complete dorsal shield (USA; Complete dorsal shield (USA; Baishui) Tang Shi)
Ptychagnostus cuyanus — photo 4
Photo 4 · KUMIP 204226-228 Cephalon holotype MCNAM Recons 2643 tructio n (Argentina; Tortello et al., 1997) (USA; Robison 1984) (drawn by Haixiang) CPC 14251 (Australia; Öpik 1979) 2 mm (Zhejiang; Baishui) Complete dorsal shield (USA; Complete dorsal shield (USA; Baishui) Tang Shi)
Ptychagnostus cuyanus — photo 5
Photo 5 · KUMIP 204226-228 Cephalon holotype MCNAM Recons 2643 tructio n (Argentina; Tortello et al., 1997) (USA; Robison 1984) (drawn by Haixiang) CPC 14251 (Australia; Öpik 1979) 2 mm (Zhejiang; Baishui) Complete dorsal shield (USA; Complete dorsal shield (USA; Baishui) Tang Shi)
Ptychagnostus cuyanus — photo 6
Photo 6 · KUMIP 204226-228 Cephalon holotype MCNAM Recons 2643 tructio n (Argentina; Tortello et al., 1997) (USA; Robison 1984) (drawn by Haixiang) CPC 14251 (Australia; Öpik 1979) 2 mm (Zhejiang; Baishui) Complete dorsal shield (USA; Complete dorsal shield (USA; Baishui) Tang Shi)
Ptychagnostus cuyanus — photo 7
Photo 7 · KUMIP 204226-228 Cephalon holotype MCNAM Recons 2643 tructio n (Argentina; Tortello et al., 1997) (USA; Robison 1984) (drawn by Haixiang) CPC 14251 (Australia; Öpik 1979) 2 mm (Zhejiang; Baishui) Complete dorsal shield (USA; Complete dorsal shield (USA; Baishui) Tang Shi)
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. cuyanus (Rusconi, 1948)
Species author
Rusconi C.
Species etymology
Unknown
Age
Cambrian, Miaolingian, Drumian
Distribution
Hunan, Zhejiang; Argentina, USA, Australia
Synonyms
Agnostus cuyanus; ?T. pictinatus; ?Peronopsis jarillensis; ?Ptychagnostus pichum; ?P. (Acidusus) retrotextus; P. (A.) germanus; P. (T.) lundgreni nanus; P. germanus; Acidusus germanus
Diagnosis
Cephalon with long posterolateral spines; cheek broad, smooth or with straight furrows; glabellar frontal lobe long, anterior end sharply pointed, F3 straight, median node at the front of M1, terminal end of posterior lobe flatly rounded; cephalic Preglabellar median furrow distinct; basal lobe distinctly bilobed. Second thoracic segment with a backward-curved spine. M2 of the pygidium hexagonal; border without lateral spines.