Asaphida

Symphysurus kientehsiensis

Order Asaphida / Superfamily Cyclopygoidea / Family Nileidae

Tremadocian to Floian (Early Ordovician)Zhejiang

Symphysurus kientehsiensis — photo 1 — Photo 1 · Type specimen (Zhejiang; left: The so-called ovate variety (Zhejiang; Lu Yanhao Nearly complete dorsal exoskeleton Sheng Xinfu 1934; right: Lu Yanhao et al. 1965) (Zhejiang; Baishui) et al. 1965) Laterally compressed specimen (Zhejiang; Guodong) Deformed specimen (Zhejiang; Jin Xingsheng et Dorsal exoskeleton lacking librigenae Internal mould specimen al. 2012) (Zhejiang; Guodong) (Zhejiang; Baishui)

Symphysurus kientehsiensis — photo 2 — Photo 2 · Type specimen (Zhejiang; left: The so-called ovate variety (Zhejiang; Lu Yanhao Nearly complete dorsal exoskeleton Sheng Xinfu 1934; right: Lu Yanhao et al. 1965) (Zhejiang; Baishui) et al. 1965) Laterally compressed specimen (Zhejiang; Guodong) Deformed specimen (Zhejiang; Jin Xingsheng et Dorsal exoskeleton lacking librigenae Internal mould specimen al. 2012) (Zhejiang; Guodong) (Zhejiang; Baishui)

Symphysurus kientehsiensis — photo 3 — Photo 3 · Type specimen (Zhejiang; left: The so-called ovate variety (Zhejiang; Lu Yanhao Nearly complete dorsal exoskeleton Sheng Xinfu 1934; right: Lu Yanhao et al. 1965) (Zhejiang; Baishui) et al. 1965) Laterally compressed specimen (Zhejiang; Guodong) Deformed specimen (Zhejiang; Jin Xingsheng et Dorsal exoskeleton lacking librigenae Internal mould specimen al. 2012) (Zhejiang; Guodong) (Zhejiang; Baishui)

Symphysurus kientehsiensis — photo 4 — Photo 4 · Type specimen (Zhejiang; left: The so-called ovate variety (Zhejiang; Lu Yanhao Nearly complete dorsal exoskeleton Sheng Xinfu 1934; right: Lu Yanhao et al. 1965) (Zhejiang; Baishui) et al. 1965) Laterally compressed specimen (Zhejiang; Guodong) Deformed specimen (Zhejiang; Jin Xingsheng et Dorsal exoskeleton lacking librigenae Internal mould specimen al. 2012) (Zhejiang; Guodong) (Zhejiang; Baishui)

Symphysurus kientehsiensis — photo 5 — Photo 5 · Type specimen (Zhejiang; left: The so-called ovate variety (Zhejiang; Lu Yanhao Nearly complete dorsal exoskeleton Sheng Xinfu 1934; right: Lu Yanhao et al. 1965) (Zhejiang; Baishui) et al. 1965) Laterally compressed specimen (Zhejiang; Guodong) Deformed specimen (Zhejiang; Jin Xingsheng et Dorsal exoskeleton lacking librigenae Internal mould specimen al. 2012) (Zhejiang; Guodong) (Zhejiang; Baishui)

Symphysurus kientehsiensis — photo 6 — Photo 6 · Type specimen (Zhejiang; left: The so-called ovate variety (Zhejiang; Lu Yanhao Nearly complete dorsal exoskeleton Sheng Xinfu 1934; right: Lu Yanhao et al. 1965) (Zhejiang; Baishui) et al. 1965) Laterally compressed specimen (Zhejiang; Guodong) Deformed specimen (Zhejiang; Jin Xingsheng et Dorsal exoskeleton lacking librigenae Internal mould specimen al. 2012) (Zhejiang; Guodong) (Zhejiang; Baishui)

Symphysurus kientehsiensis — photo 7 — Photo 7 · Type specimen (Zhejiang; left: The so-called ovate variety (Zhejiang; Lu Yanhao Nearly complete dorsal exoskeleton Sheng Xinfu 1934; right: Lu Yanhao et al. 1965) (Zhejiang; Baishui) et al. 1965) Laterally compressed specimen (Zhejiang; Guodong) Deformed specimen (Zhejiang; Jin Xingsheng et Dorsal exoskeleton lacking librigenae Internal mould specimen al. 2012) (Zhejiang; Guodong) (Zhejiang; Baishui)

Symphysurus kientehsiensis — photo 8 — Photo 8 · Type specimen (Zhejiang; left: The so-called ovate variety (Zhejiang; Lu Yanhao Nearly complete dorsal exoskeleton Sheng Xinfu 1934; right: Lu Yanhao et al. 1965) (Zhejiang; Baishui) et al. 1965) Laterally compressed specimen (Zhejiang; Guodong) Deformed specimen (Zhejiang; Jin Xingsheng et Dorsal exoskeleton lacking librigenae Internal mould specimen al. 2012) (Zhejiang; Guodong) (Zhejiang; Baishui)

Symphysurus kientehsiensis — photo 9 — Photo 9 · Type specimen (Zhejiang; left: The so-called ovate variety (Zhejiang; Lu Yanhao Nearly complete dorsal exoskeleton Sheng Xinfu 1934; right: Lu Yanhao et al. 1965) (Zhejiang; Baishui) et al. 1965) Laterally compressed specimen (Zhejiang; Guodong) Deformed specimen (Zhejiang; Jin Xingsheng et Dorsal exoskeleton lacking librigenae Internal mould specimen al. 2012) (Zhejiang; Guodong) (Zhejiang; Baishui)

Classification

Order Asaphida / Superfamily Cyclopygoidea / Family Nileidae

Genus

Symphysurus Goldfuss, 1843

Genus author

Goldfuss A.

Genus etymology

symphy-, Greek, glued together

Species

S. kientehsiensis (Sheng, 1934)

Species author

Sheng Xinfu

Species etymology

Kientehsien, Jiande County, now Jiande City, Hangzhou, Zhejiang

Age

Tremadocian to Floian (Early Ordovician)

Distribution

Zhejiang

Synonyms

Asaphus kientehsiensis; Asaphus kientehsiensis var. ovatus; Symphysurus kientehsiensis var. ovatus

Diagnosis

Cephalon and pygidium subequal, both semicircular. Glabella subsquare, widening anteriorly; glabellar and occipital furrows absent; palpebral lobes large, at the middle of the cranidium; librigenae medium-wide with rounded genal angles. Thorax of 8 segments; axis narrower than pleurae; pleural spines absent. Pygidial axis faint, short-conical; pleural region smooth; pygidial border absent (the border shown on some specimens is actually the doublure).