Asaphida

Zhiyia sp.

Order Asaphida / Superfamily Asaphoidea / Family Asaphidae

Floian (Early Ordovician)Hunan

Zhiyia sp. — photo 1 — Photo 1 · research in China Restoration (Chen (Hunan; Chen Haomeng et al. Complete dorsal exoskeleton Complete dorsal exoskeleton Haomeng et al. 2023) 2023) (Hunan; Jiaoshi Shidi) (Hunan; Dai Xu) Enrolled specimen (Duojia Dian Obliquely stretched specimen (Hunan; Laterally stretched specimen (Hunan; Mifa) Pengcheng Jianke) Shamou Zhizi) Ventrally compressed specimen preserving the hypostome (Baishui) Slab specimen (Hunan; Lixia)

Zhiyia sp. — photo 2 — Photo 2 · research in China Restoration (Chen (Hunan; Chen Haomeng et al. Complete dorsal exoskeleton Complete dorsal exoskeleton Haomeng et al. 2023) 2023) (Hunan; Jiaoshi Shidi) (Hunan; Dai Xu) Enrolled specimen (Duojia Dian Obliquely stretched specimen (Hunan; Laterally stretched specimen (Hunan; Mifa) Pengcheng Jianke) Shamou Zhizi) Ventrally compressed specimen preserving the hypostome (Baishui) Slab specimen (Hunan; Lixia)

Zhiyia sp. — photo 3 — Photo 3 · research in China Restoration (Chen (Hunan; Chen Haomeng et al. Complete dorsal exoskeleton Complete dorsal exoskeleton Haomeng et al. 2023) 2023) (Hunan; Jiaoshi Shidi) (Hunan; Dai Xu) Enrolled specimen (Duojia Dian Obliquely stretched specimen (Hunan; Laterally stretched specimen (Hunan; Mifa) Pengcheng Jianke) Shamou Zhizi) Ventrally compressed specimen preserving the hypostome (Baishui) Slab specimen (Hunan; Lixia)

Zhiyia sp. — photo 4 — Photo 4 · research in China Restoration (Chen (Hunan; Chen Haomeng et al. Complete dorsal exoskeleton Complete dorsal exoskeleton Haomeng et al. 2023) 2023) (Hunan; Jiaoshi Shidi) (Hunan; Dai Xu) Enrolled specimen (Duojia Dian Obliquely stretched specimen (Hunan; Laterally stretched specimen (Hunan; Mifa) Pengcheng Jianke) Shamou Zhizi) Ventrally compressed specimen preserving the hypostome (Baishui) Slab specimen (Hunan; Lixia)

Zhiyia sp. — photo 5 — Photo 5 · research in China Restoration (Chen (Hunan; Chen Haomeng et al. Complete dorsal exoskeleton Complete dorsal exoskeleton Haomeng et al. 2023) 2023) (Hunan; Jiaoshi Shidi) (Hunan; Dai Xu) Enrolled specimen (Duojia Dian Obliquely stretched specimen (Hunan; Laterally stretched specimen (Hunan; Mifa) Pengcheng Jianke) Shamou Zhizi) Ventrally compressed specimen preserving the hypostome (Baishui) Slab specimen (Hunan; Lixia)

Zhiyia sp. — photo 6 — Photo 6 · research in China Restoration (Chen (Hunan; Chen Haomeng et al. Complete dorsal exoskeleton Complete dorsal exoskeleton Haomeng et al. 2023) 2023) (Hunan; Jiaoshi Shidi) (Hunan; Dai Xu) Enrolled specimen (Duojia Dian Obliquely stretched specimen (Hunan; Laterally stretched specimen (Hunan; Mifa) Pengcheng Jianke) Shamou Zhizi) Ventrally compressed specimen preserving the hypostome (Baishui) Slab specimen (Hunan; Lixia)

Zhiyia sp. — photo 7 — Photo 7 · research in China Restoration (Chen (Hunan; Chen Haomeng et al. Complete dorsal exoskeleton Complete dorsal exoskeleton Haomeng et al. 2023) 2023) (Hunan; Jiaoshi Shidi) (Hunan; Dai Xu) Enrolled specimen (Duojia Dian Obliquely stretched specimen (Hunan; Laterally stretched specimen (Hunan; Mifa) Pengcheng Jianke) Shamou Zhizi) Ventrally compressed specimen preserving the hypostome (Baishui) Slab specimen (Hunan; Lixia)

Zhiyia sp. — photo 8 — Photo 8 · research in China Restoration (Chen (Hunan; Chen Haomeng et al. Complete dorsal exoskeleton Complete dorsal exoskeleton Haomeng et al. 2023) 2023) (Hunan; Jiaoshi Shidi) (Hunan; Dai Xu) Enrolled specimen (Duojia Dian Obliquely stretched specimen (Hunan; Laterally stretched specimen (Hunan; Mifa) Pengcheng Jianke) Shamou Zhizi) Ventrally compressed specimen preserving the hypostome (Baishui) Slab specimen (Hunan; Lixia)

Zhiyia sp. — photo 9 — Photo 9 · research in China Restoration (Chen (Hunan; Chen Haomeng et al. Complete dorsal exoskeleton Complete dorsal exoskeleton Haomeng et al. 2023) 2023) (Hunan; Jiaoshi Shidi) (Hunan; Dai Xu) Enrolled specimen (Duojia Dian Obliquely stretched specimen (Hunan; Laterally stretched specimen (Hunan; Mifa) Pengcheng Jianke) Shamou Zhizi) Ventrally compressed specimen preserving the hypostome (Baishui) Slab specimen (Hunan; Lixia)

Classification

Order Asaphida / Superfamily Asaphoidea / Family Asaphidae

Genus

Zhiyia Wei & Zhou, 2023

Genus author

Wei Xin, Zhou Zhiqiang

Genus etymology

Zhiyi, in memory of Prof. Zhou Zhiyi, palaeontologist of NIGP, who made great contributions to trilobite

Species

Zhiyia sp.

Species author

Species etymology

Age

Floian (Early Ordovician)

Distribution

Hunan

Diagnosis

Dorsal shield smooth, with concentric terrace lines on the border. Cephalon semicircular; in some specimens the glabellar convexity and anterior border are visible; glabellar, dorsal and occipital furrows all indistinct; palpebral lobes rather large, semicircular; anterior branches of facial sutures widening forward then smoothly curving inward, meeting at an obtuse angle; librigenae wide with rounded, spineless genal angles. Thorax of 8 segments; axis subrectangular, slightly wider than pleurae; pygidium semicircular; axis indistinct; border wide.

Remarks

Compared with the type species Zhiyia tsinghaiensis, this species has a smoother, narrower and longer cranidium and pygidium, and shallower preglabellar and occipital furrows. It is commonly known as the "slipper trilobite".