Agnostida

Tomagnostus ezhuangensis

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Ptychagnostidae

Cambrian, Miaolingian, WuliuanShandong
Tomagnostus ezhuangensis — photo 1
Photo 1 · Zhu Xuejian Cephalon holotype Illustrated NIGP143825 specimen s (Shandong; Yuan Jinliang et al. (Shandong; Yuan Jinliang et al. 2012) 2012) Complete dorsal shield Complete dorsal shield Complete dorsal shield (Shandong; (Shandong; Baishui) Chen's Qianzhoulong) (Shandong; Dakai)
Tomagnostus ezhuangensis — photo 2
Photo 2 · Zhu Xuejian Cephalon holotype Illustrated NIGP143825 specimen s (Shandong; Yuan Jinliang et al. (Shandong; Yuan Jinliang et al. 2012) 2012) Complete dorsal shield Complete dorsal shield Complete dorsal shield (Shandong; (Shandong; Baishui) Chen's Qianzhoulong) (Shandong; Dakai)
Tomagnostus ezhuangensis — photo 3
Photo 3 · Zhu Xuejian Cephalon holotype Illustrated NIGP143825 specimen s (Shandong; Yuan Jinliang et al. (Shandong; Yuan Jinliang et al. 2012) 2012) Complete dorsal shield Complete dorsal shield Complete dorsal shield (Shandong; (Shandong; Baishui) Chen's Qianzhoulong) (Shandong; Dakai)
Tomagnostus ezhuangensis — photo 4
Photo 4 · Zhu Xuejian Cephalon holotype Illustrated NIGP143825 specimen s (Shandong; Yuan Jinliang et al. (Shandong; Yuan Jinliang et al. 2012) 2012) Complete dorsal shield Complete dorsal shield Complete dorsal shield (Shandong; (Shandong; Baishui) Chen's Qianzhoulong) (Shandong; Dakai)
Tomagnostus ezhuangensis — photo 5
Photo 5 · Zhu Xuejian Cephalon holotype Illustrated NIGP143825 specimen s (Shandong; Yuan Jinliang et al. (Shandong; Yuan Jinliang et al. 2012) 2012) Complete dorsal shield Complete dorsal shield Complete dorsal shield (Shandong; (Shandong; Baishui) Chen's Qianzhoulong) (Shandong; Dakai)
Classification
Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Ptychagnostidae
Genus
Tomagnostus Howell, 1935
Genus author
Howell B. F.
Genus etymology
tom-, Greek, cut; Agnostus, a trilobite genus name.
Species
T. ezhuangensis Yuan, Li, Mu, Lin & Zhu, 2012
Species author
Yuan Jinliang, Li Yue, Mu Xinan, Lin Ribai,
Species etymology
Ezhuang, Ezhuang Township, Zichuan, Shandong.
Age
Cambrian, Miaolingian, Wuliuan
Distribution
Shandong
Synonyms
Tomagnostus(Paratomagnostus)ezhuangensis
Diagnosis
Glabellar frontal lobe subtriangular, anterior margin subacutely rounded, F3 slightly curved backward, posterior lobe cylindrical with rounded terminal end; preglabellar median furrow broad and shallow, extending to the anterior border furrow; basal lobe small. Pygidial axis long, Terminal end close to the posterior border furrow; F1 inverted V-shaped, F2 straight; median node stout but weak, on M2, its end slightly beyond F2; anterior-middle part of the posterior axial ring with transverse depression; border with small lateral spines.