Phacopida

Yanhaoia huayinshanensis

Order Phacopida / Suborder Phacopina / Superfamily Phacopoidea / Family Pterygometopidae

Dapingian to Darriwilian (Middle Ordovician)Sichuan, Shaanxi, Xinjiang

Yanhaoia huayinshanensis — photo 1 — Photo 1 · Zhou Tianrong researcher, who studied the type species Holotype NIGP 16991 (Sichuan; Lu Yanhao 1975) (Zhou et al., 1998) (Shaanxi; Zhou Zhiqiang et al. 1982) (Xinjiang; Zhou et al., First complete dorsal exoskeleton 1998) (Shaanxi; 23333)

Yanhaoia huayinshanensis — photo 2 — Photo 2 · Zhou Tianrong researcher, who studied the type species Holotype NIGP 16991 (Sichuan; Lu Yanhao 1975) (Zhou et al., 1998) (Shaanxi; Zhou Zhiqiang et al. 1982) (Xinjiang; Zhou et al., First complete dorsal exoskeleton 1998) (Shaanxi; 23333)

Yanhaoia huayinshanensis — photo 3 — Photo 3 · Zhou Tianrong researcher, who studied the type species Holotype NIGP 16991 (Sichuan; Lu Yanhao 1975) (Zhou et al., 1998) (Shaanxi; Zhou Zhiqiang et al. 1982) (Xinjiang; Zhou et al., First complete dorsal exoskeleton 1998) (Shaanxi; 23333)

Yanhaoia huayinshanensis — photo 4 — Photo 4 · Zhou Tianrong researcher, who studied the type species Holotype NIGP 16991 (Sichuan; Lu Yanhao 1975) (Zhou et al., 1998) (Shaanxi; Zhou Zhiqiang et al. 1982) (Xinjiang; Zhou et al., First complete dorsal exoskeleton 1998) (Shaanxi; 23333)

Yanhaoia huayinshanensis — photo 5 — Photo 5 · Zhou Tianrong researcher, who studied the type species Holotype NIGP 16991 (Sichuan; Lu Yanhao 1975) (Zhou et al., 1998) (Shaanxi; Zhou Zhiqiang et al. 1982) (Xinjiang; Zhou et al., First complete dorsal exoskeleton 1998) (Shaanxi; 23333)

Classification

Order Phacopida / Suborder Phacopina / Superfamily Phacopoidea / Family Pterygometopidae

Genus

Yanhaoia Zhou, Dean, Yuan & Zhou, 1998

Genus author

Zhou Zhiyi, Dean W. T., Yuan Wenwei,

Genus etymology

Yanhao, in honour of Prof. Lu Yanhao, the renowned Chinese stratigrapher, palaeontologist and trilobite

Species

Y. huayinshanensis (Lu, 1975)

Species author

Lu Yanhao

Species etymology

Huayinshan, Mount Huaying, Yuechi, Sichuan

Age

Dapingian to Darriwilian (Middle Ordovician)

Distribution

Sichuan, Shaanxi, Xinjiang

Synonyms

Pterygometopus huayinshanensis

Diagnosis

Cephalon semi-elliptical with short genal spines; glabella convex, anterior lobe strongly expanded, three pairs of deep short glabellar furrows; occipital ring with a pair of circular lateral lobes; dorsal furrows wide and deep; eyes large, crescentic. Thorax of 11 segments; axial rings rectangular; pleurae with deep, wide oblique pleural furrows, sloping steeply outward to sharp ends. Pygidium semi-elliptical; axis conical, of 7 rings plus a terminal piece; pleural furrows and ribs distinct; no distinct pygidial border.

Remarks

This species is the type species of the genus Yanhaoia.