Asaphida

Xenocyclopyge radiata

Order Asaphida / Superfamily Cyclopygoidea / Family Cyclopygidae

Sandbian to Katian (Late Ordovician)Shaanxi, Yunnan

Xenocyclopyge radiata — photo 1 — Photo 1 · Holotype NIGP16800 (Shaanxi; Lu Yanhao 1975) Eye and pygidium specimens (Shaanxi; Lu Yanhao 1975) Librigena, cephalon and pygidium specimens (Shaanxi; Zhou Zhiqiang et al. 2016) (Yunnan; Qianli Zhijiang) (Yunnan; Tuyang Tuseng (Yunna Po) n; Lixia)

Xenocyclopyge radiata — photo 2 — Photo 2 · Holotype NIGP16800 (Shaanxi; Lu Yanhao 1975) Eye and pygidium specimens (Shaanxi; Lu Yanhao 1975) Librigena, cephalon and pygidium specimens (Shaanxi; Zhou Zhiqiang et al. 2016) (Yunnan; Qianli Zhijiang) (Yunnan; Tuyang Tuseng (Yunna Po) n; Lixia)

Xenocyclopyge radiata — photo 3 — Photo 3 · Holotype NIGP16800 (Shaanxi; Lu Yanhao 1975) Eye and pygidium specimens (Shaanxi; Lu Yanhao 1975) Librigena, cephalon and pygidium specimens (Shaanxi; Zhou Zhiqiang et al. 2016) (Yunnan; Qianli Zhijiang) (Yunnan; Tuyang Tuseng (Yunna Po) n; Lixia)

Xenocyclopyge radiata — photo 4 — Photo 4 · Holotype NIGP16800 (Shaanxi; Lu Yanhao 1975) Eye and pygidium specimens (Shaanxi; Lu Yanhao 1975) Librigena, cephalon and pygidium specimens (Shaanxi; Zhou Zhiqiang et al. 2016) (Yunnan; Qianli Zhijiang) (Yunnan; Tuyang Tuseng (Yunna Po) n; Lixia)

Xenocyclopyge radiata — photo 5 — Photo 5 · Holotype NIGP16800 (Shaanxi; Lu Yanhao 1975) Eye and pygidium specimens (Shaanxi; Lu Yanhao 1975) Librigena, cephalon and pygidium specimens (Shaanxi; Zhou Zhiqiang et al. 2016) (Yunnan; Qianli Zhijiang) (Yunnan; Tuyang Tuseng (Yunna Po) n; Lixia)

Xenocyclopyge radiata — photo 6 — Photo 6 · Holotype NIGP16800 (Shaanxi; Lu Yanhao 1975) Eye and pygidium specimens (Shaanxi; Lu Yanhao 1975) Librigena, cephalon and pygidium specimens (Shaanxi; Zhou Zhiqiang et al. 2016) (Yunnan; Qianli Zhijiang) (Yunnan; Tuyang Tuseng (Yunna Po) n; Lixia)

Xenocyclopyge radiata — photo 7 — Photo 7 · Holotype NIGP16800 (Shaanxi; Lu Yanhao 1975) Eye and pygidium specimens (Shaanxi; Lu Yanhao 1975) Librigena, cephalon and pygidium specimens (Shaanxi; Zhou Zhiqiang et al. 2016) (Yunnan; Qianli Zhijiang) (Yunnan; Tuyang Tuseng (Yunna Po) n; Lixia)

Classification

Order Asaphida / Superfamily Cyclopygoidea / Family Cyclopygidae

Genus

Xenocyclopyge Lu, 1962

Genus author

Lu Yanhao

Genus etymology

xeno-, from Greek xénos, foreign, strange; Cyclopyge, a trilobite genus name

Species

X. radiata Lu, 1962

Species author

Lu Yanhao

Species etymology

radiata, radiating, referring to the two pairs of short radiating glabellar furrows of this species

Age

Sandbian to Katian (Late Ordovician)

Distribution

Shaanxi, Yunnan

Diagnosis

Cranidium long-ovate with broadly rounded front; glabella with two pairs of pit-like radiating glabellar furrows; compound eyes of 35-38 rows of polygonal lenses. Thorax of five segments; axis wider than pleurae, gently narrowing backward. Pygidium semi-elliptical; axis short, conical, segmentation faint; pleural lobes indistinctly segmented; border furrow faint on the lateral margins of the pygidium, absent behind the axis.

Remarks

This species is the type species of the genus Xenocyclopyge.