Agnostida

Tsunyidiscus niutitangensis

Order Agnostida / Suborder Eodiscina / Superfamily Eodiscoidea / Family Tsunyidiscidae

Cambrian, Series 2, Stage 3Guizhou, Yunnan
Tsunyidiscus niutitangensis — photo 1
Photo 1 · Holotype NIGP21470 (Guizhou; (Guizhou; Peng Shanchi (Yunnan; Steiner et al., 2001) (Guizhou; Wu Weiyi et al. 2018) Peng Shanchi 2020) 2020) First reported eodiscid moulting specimen, inverted LCU (Guizhou; Wang et al., 2023) (Guizhou; Yang Xinglian et al. 2024) Illustrated specimens (Guizhou; Steiner et al., (Guizhou; Sun Zhixin et al. 2005) 2025)
Tsunyidiscus niutitangensis — photo 2
Photo 2 · Holotype NIGP21470 (Guizhou; (Guizhou; Peng Shanchi (Yunnan; Steiner et al., 2001) (Guizhou; Wu Weiyi et al. 2018) Peng Shanchi 2020) 2020) First reported eodiscid moulting specimen, inverted LCU (Guizhou; Wang et al., 2023) (Guizhou; Yang Xinglian et al. 2024) Illustrated specimens (Guizhou; Steiner et al., (Guizhou; Sun Zhixin et al. 2005) 2025)
Tsunyidiscus niutitangensis — photo 3
Photo 3 · Holotype NIGP21470 (Guizhou; (Guizhou; Peng Shanchi (Yunnan; Steiner et al., 2001) (Guizhou; Wu Weiyi et al. 2018) Peng Shanchi 2020) 2020) First reported eodiscid moulting specimen, inverted LCU (Guizhou; Wang et al., 2023) (Guizhou; Yang Xinglian et al. 2024) Illustrated specimens (Guizhou; Steiner et al., (Guizhou; Sun Zhixin et al. 2005) 2025)
Tsunyidiscus niutitangensis — photo 4
Photo 4 · Holotype NIGP21470 (Guizhou; (Guizhou; Peng Shanchi (Yunnan; Steiner et al., 2001) (Guizhou; Wu Weiyi et al. 2018) Peng Shanchi 2020) 2020) First reported eodiscid moulting specimen, inverted LCU (Guizhou; Wang et al., 2023) (Guizhou; Yang Xinglian et al. 2024) Illustrated specimens (Guizhou; Steiner et al., (Guizhou; Sun Zhixin et al. 2005) 2025)
Tsunyidiscus niutitangensis — photo 5
Photo 5 · Holotype NIGP21470 (Guizhou; (Guizhou; Peng Shanchi (Yunnan; Steiner et al., 2001) (Guizhou; Wu Weiyi et al. 2018) Peng Shanchi 2020) 2020) First reported eodiscid moulting specimen, inverted LCU (Guizhou; Wang et al., 2023) (Guizhou; Yang Xinglian et al. 2024) Illustrated specimens (Guizhou; Steiner et al., (Guizhou; Sun Zhixin et al. 2005) 2025)
Tsunyidiscus niutitangensis — photo 6
Photo 6 · Holotype NIGP21470 (Guizhou; (Guizhou; Peng Shanchi (Yunnan; Steiner et al., 2001) (Guizhou; Wu Weiyi et al. 2018) Peng Shanchi 2020) 2020) First reported eodiscid moulting specimen, inverted LCU (Guizhou; Wang et al., 2023) (Guizhou; Yang Xinglian et al. 2024) Illustrated specimens (Guizhou; Steiner et al., (Guizhou; Sun Zhixin et al. 2005) 2025)
Tsunyidiscus niutitangensis — photo 7
Photo 7 · Holotype NIGP21470 (Guizhou; (Guizhou; Peng Shanchi (Yunnan; Steiner et al., 2001) (Guizhou; Wu Weiyi et al. 2018) Peng Shanchi 2020) 2020) First reported eodiscid moulting specimen, inverted LCU (Guizhou; Wang et al., 2023) (Guizhou; Yang Xinglian et al. 2024) Illustrated specimens (Guizhou; Steiner et al., (Guizhou; Sun Zhixin et al. 2005) 2025)
Tsunyidiscus niutitangensis — photo 8
Photo 8 · Holotype NIGP21470 (Guizhou; (Guizhou; Peng Shanchi (Yunnan; Steiner et al., 2001) (Guizhou; Wu Weiyi et al. 2018) Peng Shanchi 2020) 2020) First reported eodiscid moulting specimen, inverted LCU (Guizhou; Wang et al., 2023) (Guizhou; Yang Xinglian et al. 2024) Illustrated specimens (Guizhou; Steiner et al., (Guizhou; Sun Zhixin et al. 2005) 2025)
Classification
Order Agnostida / Suborder Eodiscina / Superfamily Eodiscoidea / Family Tsunyidiscidae
Genus
Tsunyidiscus Chang, 1966
Genus author
Zhang Wentang
Genus etymology
Tsunyi, Zunyi, Guizhou; discus, disc.
Species
T. niutitangensis (Zhang in Lu et al., 1974)
Species author
Zhang Wentang
Species etymology
Niutitang, Niutitang, Zunyi, Guizhou.
Age
Cambrian, Series 2, Stage 3
Distribution
Guizhou, Yunnan
Synonyms
Hebediscus niutitangensis
Diagnosis
Glabella elongate-conical, anterior margin rounded, with two weak crossing glabellar furrows; occipital ring with small occipital spine; palpebral lobe of moderate length; eye ridge slender; anterior border gently convex, sometimes with tubercles, between the tubercles anteriorly with fine furrow and ridge-like raised outer margin. Pygidial axis not reaching the border furrow, with about six rings; pleural region with four to five pairs of pleural furrows; border furrow fine and distinct; border narrow and ridge-like.
Remarks
This species is the type species of Tsunyidiscus.