Corynexochida

Shergoldia laevigata

Order Corynexochida / Suborder Illaenina / Superfamily Illaenoidea / Family Tsinaniidae

Jiangshanian (Furongian, Cambrian)Guangxi
Shergoldia laevigata — photo 1
Photo 1 · Type specimens (A latex cast, B internal mould; Guangxi; Zhu et al., 2007) Restoration (Zong 2021) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Chengzi) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Qianli Zhijiang) (Guangxi; Pengcheng Jianke)
Shergoldia laevigata — photo 2
Photo 2 · Type specimens (A latex cast, B internal mould; Guangxi; Zhu et al., 2007) Restoration (Zong 2021) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Chengzi) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Qianli Zhijiang) (Guangxi; Pengcheng Jianke)
Shergoldia laevigata — photo 3
Photo 3 · Type specimens (A latex cast, B internal mould; Guangxi; Zhu et al., 2007) Restoration (Zong 2021) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Chengzi) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Qianli Zhijiang) (Guangxi; Pengcheng Jianke)
Shergoldia laevigata — photo 4
Photo 4 · Type specimens (A latex cast, B internal mould; Guangxi; Zhu et al., 2007) Restoration (Zong 2021) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Chengzi) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Qianli Zhijiang) (Guangxi; Pengcheng Jianke)
Shergoldia laevigata — photo 5
Photo 5 · Type specimens (A latex cast, B internal mould; Guangxi; Zhu et al., 2007) Restoration (Zong 2021) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Chengzi) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Qianli Zhijiang) (Guangxi; Pengcheng Jianke)
Shergoldia laevigata — photo 6
Photo 6 · Type specimens (A latex cast, B internal mould; Guangxi; Zhu et al., 2007) Restoration (Zong 2021) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Chengzi) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Qianli Zhijiang) (Guangxi; Pengcheng Jianke)
Shergoldia laevigata — photo 7
Photo 7 · Type specimens (A latex cast, B internal mould; Guangxi; Zhu et al., 2007) Restoration (Zong 2021) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Chengzi) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Qianli Zhijiang) (Guangxi; Pengcheng Jianke)
Shergoldia laevigata — photo 8
Photo 8 · Type specimens (A latex cast, B internal mould; Guangxi; Zhu et al., 2007) Restoration (Zong 2021) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Chengzi) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Qianli Zhijiang) (Guangxi; Pengcheng Jianke)
Shergoldia laevigata — photo 9
Photo 9 · Type specimens (A latex cast, B internal mould; Guangxi; Zhu et al., 2007) Restoration (Zong 2021) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Chengzi) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Qianli Zhijiang) (Guangxi; Pengcheng Jianke)
Shergoldia laevigata — photo 10
Photo 10 · Type specimens (A latex cast, B internal mould; Guangxi; Zhu et al., 2007) Restoration (Zong 2021) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Chengzi) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Qianli Zhijiang) (Guangxi; Pengcheng Jianke)
Classification
Order Corynexochida / Suborder Illaenina / Superfamily Illaenoidea / Family Tsinaniidae
Genus
Shergoldia Zhang & Jell, 1987
Genus author
Zhang Wentang & Jell P. A.
Genus etymology
In honour of Dr. J. H. Shergold
Species
S. laevigata Zhu, Hughes & Peng, 2007
Species author
Zhu Xuejian, Hughes N. C., Peng Shanchi
Species etymology
laevigata, Latin, smooth, referring to the smooth dorsal surface
Age
Jiangshanian (Furongian, Cambrian)
Distribution
Guangxi
Synonyms
Tsinania laevigata
Diagnosis
Isopygous opisthoparian trilobite with elongate-elliptical, smooth dorsal shield. Cephalon semicircular apart from genal spines; glabella subtrapezoidal, weakly convex, glabellar furrows effaced; occipital furrow effaced, occipital ring indistinct from the glabella; dorsal furrow faint; anterior border transversely triangular; palpebral lobes arcuate and convex; fixigenae wide in the palpebral area; librigenae wide with wide lateral borders and stout genal spines; anterior branches of facial sutures slightly divergent forward, crossing the middle of the anterior border; posterior branches extending backward and slightly outward in a gentle curve. Thorax of 8 segments, axis narrower than pleurae; pleural inner parts horizontal, of uniform width; pleural spines short. Pygidium semicircular and convex; axis long-conical with many rings; pygidial border wide; two lateral spines present in meraspid and early holaspid stages.