Agnostida

Micragnostus chiushuensis

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Agnostidae

Cambrian, Furongian Jiangshanian to Stage 10Liaoning, Hebei, Hunan, Zhejiang, Guangxi

Micragnostus chiushuensis — photo 1 — Photo 1 · Type specimens PA135, 139, 138, 136 NIGP 83396, 83397 NIGP 83024 (Liaoning; Sun 1989) Reconstruction (Zhejiang; Peng Shanchi (Hunan; Peng Shanchi 2020) (drawn by Haixiang) 2020) Complete dorsal shield Complete dorsal shield NIGP 79057, 79059 (Hebei; Sun 1989) (Guangxi; Baishui) (Guangxi; Guodong)

Micragnostus chiushuensis — photo 2 — Photo 2 · Type specimens PA135, 139, 138, 136 NIGP 83396, 83397 NIGP 83024 (Liaoning; Sun 1989) Reconstruction (Zhejiang; Peng Shanchi (Hunan; Peng Shanchi 2020) (drawn by Haixiang) 2020) Complete dorsal shield Complete dorsal shield NIGP 79057, 79059 (Hebei; Sun 1989) (Guangxi; Baishui) (Guangxi; Guodong)

Micragnostus chiushuensis — photo 3 — Photo 3 · Type specimens PA135, 139, 138, 136 NIGP 83396, 83397 NIGP 83024 (Liaoning; Sun 1989) Reconstruction (Zhejiang; Peng Shanchi (Hunan; Peng Shanchi 2020) (drawn by Haixiang) 2020) Complete dorsal shield Complete dorsal shield NIGP 79057, 79059 (Hebei; Sun 1989) (Guangxi; Baishui) (Guangxi; Guodong)

Micragnostus chiushuensis — photo 4 — Photo 4 · Type specimens PA135, 139, 138, 136 NIGP 83396, 83397 NIGP 83024 (Liaoning; Sun 1989) Reconstruction (Zhejiang; Peng Shanchi (Hunan; Peng Shanchi 2020) (drawn by Haixiang) 2020) Complete dorsal shield Complete dorsal shield NIGP 79057, 79059 (Hebei; Sun 1989) (Guangxi; Baishui) (Guangxi; Guodong)

Micragnostus chiushuensis — photo 5 — Photo 5 · Type specimens PA135, 139, 138, 136 NIGP 83396, 83397 NIGP 83024 (Liaoning; Sun 1989) Reconstruction (Zhejiang; Peng Shanchi (Hunan; Peng Shanchi 2020) (drawn by Haixiang) 2020) Complete dorsal shield Complete dorsal shield NIGP 79057, 79059 (Hebei; Sun 1989) (Guangxi; Baishui) (Guangxi; Guodong)

Micragnostus chiushuensis — photo 6 — Photo 6 · Type specimens PA135, 139, 138, 136 NIGP 83396, 83397 NIGP 83024 (Liaoning; Sun 1989) Reconstruction (Zhejiang; Peng Shanchi (Hunan; Peng Shanchi 2020) (drawn by Haixiang) 2020) Complete dorsal shield Complete dorsal shield NIGP 79057, 79059 (Hebei; Sun 1989) (Guangxi; Baishui) (Guangxi; Guodong)

Micragnostus chiushuensis — photo 7 — Photo 7 · Type specimens PA135, 139, 138, 136 NIGP 83396, 83397 NIGP 83024 (Liaoning; Sun 1989) Reconstruction (Zhejiang; Peng Shanchi (Hunan; Peng Shanchi 2020) (drawn by Haixiang) 2020) Complete dorsal shield Complete dorsal shield NIGP 79057, 79059 (Hebei; Sun 1989) (Guangxi; Baishui) (Guangxi; Guodong)

Classification

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Agnostidae

Genus

Micragnostus Howell, 1935

Genus author

Howell, 1935

Genus etymology

micr-, Greek, small; Agnostus, a trilobite genus name.

Species

M. chiushuensis (Kobayashi, 1931)

Species author

Kobayashi T.

Species etymology

Chiushu, Qiushugou, Benxi, Liaoning, the type locality.

Age

Cambrian, Furongian Jiangshanian to Stage 10

Distribution

Liaoning, Hebei, Hunan, Zhejiang, Guangxi

Diagnosis

Anterior end of glabella rounded, posterior lobe widening uniformly backward, posterior end rounded, median node at the middle of the posterior lobe, sometimes indistinct; basal lobe small, triangular; border furrow broad. Anterior axial ring of pygidium lobe distinctly tripartite, axial node slightly longer than the frontal lobe; border broad with short posterolateral spines.

Remarks

Typical body length about 0.2-1 cm.