Asaphida

Charchaqia norini

Order Asaphida / Superfamily Asaphoidea / Family Ceratopygidae

Stage 10 (Furongian, Cambrian)Zhejiang, Xinjiang, Hunan, Guizhou

Charchaqia norini — photo 1 — Photo 1 · Early literature specimen (Xinjiang; Lu Yanhao Meraspid specimens, 1957) each 1.5 mm long (Zhejiang; Baishui) Complete dorsal exoskeleton Complete dorsal exoskeleton (Zhejiang; Baishui) (Xinjiang; Guodong)

Charchaqia norini — photo 2 — Photo 2 · Early literature specimen (Xinjiang; Lu Yanhao Meraspid specimens, 1957) each 1.5 mm long (Zhejiang; Baishui) Complete dorsal exoskeleton Complete dorsal exoskeleton (Zhejiang; Baishui) (Xinjiang; Guodong)

Charchaqia norini — photo 3 — Photo 3 · Early literature specimen (Xinjiang; Lu Yanhao Meraspid specimens, 1957) each 1.5 mm long (Zhejiang; Baishui) Complete dorsal exoskeleton Complete dorsal exoskeleton (Zhejiang; Baishui) (Xinjiang; Guodong)

Charchaqia norini — photo 4 — Photo 4 · Early literature specimen (Xinjiang; Lu Yanhao Meraspid specimens, 1957) each 1.5 mm long (Zhejiang; Baishui) Complete dorsal exoskeleton Complete dorsal exoskeleton (Zhejiang; Baishui) (Xinjiang; Guodong)

Charchaqia norini — photo 5 — Photo 5 · Early literature specimen (Xinjiang; Lu Yanhao Meraspid specimens, 1957) each 1.5 mm long (Zhejiang; Baishui) Complete dorsal exoskeleton Complete dorsal exoskeleton (Zhejiang; Baishui) (Xinjiang; Guodong)

Classification

Order Asaphida / Superfamily Asaphoidea / Family Ceratopygidae

Genus

Charchaqia Troedsson, 1937

Genus author

Troedsson G. T.

Genus etymology

Charchaq, the Charchaq Mountains in the Kuruktag region of Xinjiang

Species

C. norini Troedsson, 1937

Species author

Troedsson G. T.

Species etymology

Norin, a surname, in honour of E. Norin, a member of the Sino-Swedish Expedition of 1928-1932

Age

Stage 10 (Furongian, Cambrian)

Distribution

Zhejiang, Xinjiang, Hunan, Guizhou

Diagnosis

Cephalon and pygidium subequal in size, surface smooth. Cranidium subtrapezoidal; glabella cylindrical with rounded front, smooth, without glabellar or occipital furrows; fixigenae about half the glabellar width; anterior border strongly upturned; palpebral lobes convex, about one-third the glabellar length; anterior branches of facial sutures extending slightly outward-forward from the anterior ends of the palpebral lobes, then turning inward, cutting the cranidial margin in an arc; librigenae wide with small genal spines. Thorax of 8 segments; axis narrower than the glabella; pleural lobes flat, anterior pleural spines rather sharp, posterior ones rounded. Pygidium semicircular, about half as long as wide; axis narrow, inverted-conical, with a distinct postaxial ridge; pleural furrows rather shallow; border furrow indistinct; outer margin of the border raised as an arcuate ridge.