Agnostida

Goniagnostus nathorsti

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Ptychagnostidae

Cambrian, Miaolingian, DrumianZhejiang, Hunan, Guizhou, Xinjiang; Norway, Sweden, Canada, Australia
Goniagnostus nathorsti — photo 1
Photo 1 · Neotype PMO19887 (Norway; Bruton (Australia; Laurie 1989) (Sweden; Weidner et al., 2023) (Hunan; Peng Shanchi 2020) 1999) (Zhejiang; Qiu Hongan et al. Complete dorsal shield (Zhejiang; Complete dorsal shield Complete dorsal shield 1983) strongZJU) (Xinjiang; Guodong) (Guizhou; Mr. Y)
Goniagnostus nathorsti — photo 2
Photo 2 · Neotype PMO19887 (Norway; Bruton (Australia; Laurie 1989) (Sweden; Weidner et al., 2023) (Hunan; Peng Shanchi 2020) 1999) (Zhejiang; Qiu Hongan et al. Complete dorsal shield (Zhejiang; Complete dorsal shield Complete dorsal shield 1983) strongZJU) (Xinjiang; Guodong) (Guizhou; Mr. Y)
Goniagnostus nathorsti — photo 3
Photo 3 · Neotype PMO19887 (Norway; Bruton (Australia; Laurie 1989) (Sweden; Weidner et al., 2023) (Hunan; Peng Shanchi 2020) 1999) (Zhejiang; Qiu Hongan et al. Complete dorsal shield (Zhejiang; Complete dorsal shield Complete dorsal shield 1983) strongZJU) (Xinjiang; Guodong) (Guizhou; Mr. Y)
Goniagnostus nathorsti — photo 4
Photo 4 · Neotype PMO19887 (Norway; Bruton (Australia; Laurie 1989) (Sweden; Weidner et al., 2023) (Hunan; Peng Shanchi 2020) 1999) (Zhejiang; Qiu Hongan et al. Complete dorsal shield (Zhejiang; Complete dorsal shield Complete dorsal shield 1983) strongZJU) (Xinjiang; Guodong) (Guizhou; Mr. Y)
Goniagnostus nathorsti — photo 5
Photo 5 · Neotype PMO19887 (Norway; Bruton (Australia; Laurie 1989) (Sweden; Weidner et al., 2023) (Hunan; Peng Shanchi 2020) 1999) (Zhejiang; Qiu Hongan et al. Complete dorsal shield (Zhejiang; Complete dorsal shield Complete dorsal shield 1983) strongZJU) (Xinjiang; Guodong) (Guizhou; Mr. Y)
Goniagnostus nathorsti — photo 6
Photo 6 · Neotype PMO19887 (Norway; Bruton (Australia; Laurie 1989) (Sweden; Weidner et al., 2023) (Hunan; Peng Shanchi 2020) 1999) (Zhejiang; Qiu Hongan et al. Complete dorsal shield (Zhejiang; Complete dorsal shield Complete dorsal shield 1983) strongZJU) (Xinjiang; Guodong) (Guizhou; Mr. Y)
Goniagnostus nathorsti — photo 7
Photo 7 · Neotype PMO19887 (Norway; Bruton (Australia; Laurie 1989) (Sweden; Weidner et al., 2023) (Hunan; Peng Shanchi 2020) 1999) (Zhejiang; Qiu Hongan et al. Complete dorsal shield (Zhejiang; Complete dorsal shield Complete dorsal shield 1983) strongZJU) (Xinjiang; Guodong) (Guizhou; Mr. Y)
Goniagnostus nathorsti — photo 8
Photo 8 · Neotype PMO19887 (Norway; Bruton (Australia; Laurie 1989) (Sweden; Weidner et al., 2023) (Hunan; Peng Shanchi 2020) 1999) (Zhejiang; Qiu Hongan et al. Complete dorsal shield (Zhejiang; Complete dorsal shield Complete dorsal shield 1983) strongZJU) (Xinjiang; Guodong) (Guizhou; Mr. Y)
Classification
Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Ptychagnostidae
Genus
Goniagnostus Howell, 1935
Genus author
Howell B. F.
Genus etymology
gon, goniatus, angular, angled; Agnostus, a trilobite genus name.
Species
G. nathorsti (Brögger, 1878)
Species author
Br ö gger W. C.
Species etymology
Nathorst, a surname.
Age
Cambrian, Miaolingian, Drumian
Distribution
Zhejiang, Hunan, Guizhou, Xinjiang; Norway, Sweden, Canada, Australia
Synonyms
Agnostus nathorsti; G.(Goniagnostus)nathorsti
Diagnosis
Cephalon and pygidium nearly round, cheek and pleural region with dense fine nodose ornament. Cheek with alternating long and short radiating furrows; preglabellar median furrow distinct; glabellar frontal lobe triangular, anterior part with short, weak anterior pit; middle of posterior lobe raised club-like, with short spines posteriorly; basal lobe small; border and border furrow both narrow; with short posterolateral spines. Second thoracic segment with axial spine. Pygidial axis slender long, mid-posterior part of the posterior lobe with transverse depression containing a small secondary median node; postaxial median furrow well developed; pygidial border broad, border furrow shallow; pygidial lateral spines short and small or absent.
Remarks
This species is the type species of Goniagnostus.