Agnostida

Ptychagnostus gibbus

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Ptychagnostidae

Cambrian, Miaolingian Wuliuan to DrumianHunan, Zhejiang; Sweden, USA, Siberia, Australia
Ptychagnostus gibbus — photo 1
Photo 1 · (Sweden; Whittington et al., 1997) Reconstruction (Öpik (USA; Robison 1982) 1979) (Australia; Öpik 1979) (Siberia; Pegel 2000) (Hunan; Peng Shanchi 2020)
Ptychagnostus gibbus — photo 2
Photo 2 · (Sweden; Whittington et al., 1997) Reconstruction (Öpik (USA; Robison 1982) 1979) (Australia; Öpik 1979) (Siberia; Pegel 2000) (Hunan; Peng Shanchi 2020)
Ptychagnostus gibbus — photo 3
Photo 3 · (Sweden; Whittington et al., 1997) Reconstruction (Öpik (USA; Robison 1982) 1979) (Australia; Öpik 1979) (Siberia; Pegel 2000) (Hunan; Peng Shanchi 2020)
Ptychagnostus gibbus — photo 4
Photo 4 · (Sweden; Whittington et al., 1997) Reconstruction (Öpik (USA; Robison 1982) 1979) (Australia; Öpik 1979) (Siberia; Pegel 2000) (Hunan; Peng Shanchi 2020)
Ptychagnostus gibbus — photo 5
Photo 5 · (Sweden; Whittington et al., 1997) Reconstruction (Öpik (USA; Robison 1982) 1979) (Australia; Öpik 1979) (Siberia; Pegel 2000) (Hunan; Peng Shanchi 2020)
Ptychagnostus gibbus — photo 6
Photo 6 · (Sweden; Whittington et al., 1997) Reconstruction (Öpik (USA; Robison 1982) 1979) (Australia; Öpik 1979) (Siberia; Pegel 2000) (Hunan; Peng Shanchi 2020)
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. gibbus (Linnarsson, 1869)
Species author
Linnarsson J. G. O.
Species etymology
gibbus, humped on one side.
Age
Cambrian, Miaolingian Wuliuan to Drumian
Distribution
Hunan, Zhejiang; Sweden, USA, Siberia, Australia
Synonyms
Agnostus gibbus; Triplagnostus(Triplagnostus)gibbus; T. gibbus
Diagnosis
Compared with Ptychagnostus cuyanus: surface smooth. Glabellar frontal lobe nearly triangular, anterior end not very sharp, posterior lobe cylindrical and not inflated. Spine of the second thoracic segment possibly longer. Pygidial axial node possibly extending into an axial spine; border usually with small lateral spines.