Agnostida

Tsunyidiscus yanjiazhaiensis

Order Agnostida / Suborder Eodiscina / Superfamily Eodiscoidea / Family Tsunyidiscidae

Cambrian, Series 2, Stage 3Guizhou, Shaanxi, Yunnan
Tsunyidiscus yanjiazhaiensis — photo 1
Photo 1 · Yuan Jinliang Cephalon holotype Ontogenetic sequence reconstruction (Dai (Guizhou; Yin et al., 2019) Gongzheng et al. 1978) NWU-YJZ 202791, 866, 808, 793, 795, 800 (Shaanxi; Dai et al., 2016) Meraspid and adult stages (Shaanxi; Dai Complete dorsal shield, part and et al., 2019) counterpart (Lixia; Yunnan)
Tsunyidiscus yanjiazhaiensis — photo 2
Photo 2 · Yuan Jinliang Cephalon holotype Ontogenetic sequence reconstruction (Dai (Guizhou; Yin et al., 2019) Gongzheng et al. 1978) NWU-YJZ 202791, 866, 808, 793, 795, 800 (Shaanxi; Dai et al., 2016) Meraspid and adult stages (Shaanxi; Dai Complete dorsal shield, part and et al., 2019) counterpart (Lixia; Yunnan)
Tsunyidiscus yanjiazhaiensis — photo 3
Photo 3 · Yuan Jinliang Cephalon holotype Ontogenetic sequence reconstruction (Dai (Guizhou; Yin et al., 2019) Gongzheng et al. 1978) NWU-YJZ 202791, 866, 808, 793, 795, 800 (Shaanxi; Dai et al., 2016) Meraspid and adult stages (Shaanxi; Dai Complete dorsal shield, part and et al., 2019) counterpart (Lixia; Yunnan)
Tsunyidiscus yanjiazhaiensis — photo 4
Photo 4 · Yuan Jinliang Cephalon holotype Ontogenetic sequence reconstruction (Dai (Guizhou; Yin et al., 2019) Gongzheng et al. 1978) NWU-YJZ 202791, 866, 808, 793, 795, 800 (Shaanxi; Dai et al., 2016) Meraspid and adult stages (Shaanxi; Dai Complete dorsal shield, part and et al., 2019) counterpart (Lixia; Yunnan)
Tsunyidiscus yanjiazhaiensis — photo 5
Photo 5 · Yuan Jinliang Cephalon holotype Ontogenetic sequence reconstruction (Dai (Guizhou; Yin et al., 2019) Gongzheng et al. 1978) NWU-YJZ 202791, 866, 808, 793, 795, 800 (Shaanxi; Dai et al., 2016) Meraspid and adult stages (Shaanxi; Dai Complete dorsal shield, part and et al., 2019) counterpart (Lixia; Yunnan)
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. yanjiazhaiensis Zhang, Zhou & Yuan in Yin et al., 1978
Species author
Zhang Sengui, Zhou Zhiyi,
Species etymology
Yanjiazhai, possibly a village name of Yankong, Jinsha, Guizhou, the type locality.
Age
Cambrian, Series 2, Stage 3
Distribution
Guizhou, Shaanxi, Yunnan
Synonyms
Tsunyidiscus qingzhenensis; Guizhoudiscus tenellus; Tsunyidiscus ziguiensis; Tsunyidiscus meitanensis; Tsunyidiscus?guizhouensis; Hupeidiscus?longispinus; Shizhudiscus gaotianyaensis; Shizhudiscus sugaitensis; Tsunyidiscus brevicus; Tsunyidiscus quadratus; Tsunyidiscus xiadongensis; Tsunyidiscus xilingxiaensis
Diagnosis
Similar to the type species Tsunyidiscus niutitangensis, the main difference being the axial spine on the thoracic axis of this species.