Corynexochida

Duyunaspis jianheensis

Order Corynexochida / Suborder Corynexochina / Family Oryctocephalidae / Family Oryctocarinae

Cambrian, Series 2, Stage 4Guizhou

Duyunaspis jianheensis — photo 1 — Photo 1 · Xinglian, Wang Mingkun Type specimen (Guizhou; photo by Reconstruction (Guizhou; Chen Beimingyu) Zhengpeng et al. 2018) Meraspid complete dorsal shield Guizhou; Photo by Ontogenetic sequence reconstruction (Guizhou; Beimingyu Chen Zhengpeng et al. 2018)

Duyunaspis jianheensis — photo 2 — Photo 2 · Xinglian, Wang Mingkun Type specimen (Guizhou; photo by Reconstruction (Guizhou; Chen Beimingyu) Zhengpeng et al. 2018) Meraspid complete dorsal shield Guizhou; Photo by Ontogenetic sequence reconstruction (Guizhou; Beimingyu Chen Zhengpeng et al. 2018)

Duyunaspis jianheensis — photo 3 — Photo 3 · Xinglian, Wang Mingkun Type specimen (Guizhou; photo by Reconstruction (Guizhou; Chen Beimingyu) Zhengpeng et al. 2018) Meraspid complete dorsal shield Guizhou; Photo by Ontogenetic sequence reconstruction (Guizhou; Beimingyu Chen Zhengpeng et al. 2018)

Duyunaspis jianheensis — photo 4 — Photo 4 · Xinglian, Wang Mingkun Type specimen (Guizhou; photo by Reconstruction (Guizhou; Chen Beimingyu) Zhengpeng et al. 2018) Meraspid complete dorsal shield Guizhou; Photo by Ontogenetic sequence reconstruction (Guizhou; Beimingyu Chen Zhengpeng et al. 2018)

Classification

Order Corynexochida / Suborder Corynexochina / Family Oryctocephalidae / Family Oryctocarinae

Genus

Duyunaspis Zhang & Qian in Zhou et al., 1977

Genus author

Zhang Wentang, Qian Yiyuan

Genus etymology

duyun, place name, type speciestype locality;aspis, shield

Species

D. jianheensis Chen, Zhao, Yang & Wang, 2018

Species author

Chen Zhengpeng, Zhao Yuanlong, Yang

Species etymology

Jianhe, type specimenstype locality

Age

Cambrian, Series 2, Stage 4

Distribution

Guizhou

Diagnosis

Small trilobite, dorsal shield elongate-oval. Cranidium subtrapezoidal; Anterior border narrow; Glabella long barrel-shaped, transversely relatively broad and distinctly inflated outward medially; With four pairs of glabellar furrows, S1-S3 pit-like Like, transversely extending straight, S4 indistinctly pit-like, in well-preserved specimens the middle parts are not connected and they are not connected to the dorsal furrow; Occipital furrow straight, deepened into long pits at both ends; proparian sutures, anterior branches short, posterior branches rather long and directed obliquely backward to the lateral border; eye ridge short, joining the dorsal furrow; palpebral lobe rather long, about half the length of the glabella, curved outward; poster Posterior limb transversely broad; Ocular area of fixed cheek narrow; Free cheek narrow, genal angle rounded. Adult with 10 thoracic segments, axis relatively broad; Pleural furrow deep; Distal end of pleural segment pointed, triangular. Pygidium small, with four ior limb transversely broad; palpebral area of fixed cheek narrow; free cheek narrow, genal angle rounded. Adults with 10 thoracic segments, axis rather broad; pleural furrows deep; pleural ribs pointed, triangular. Pygidium small, with 4 axial rings and one terminal piece; posterior margin with a median notch.