Corynexochida

Postikaolishania megaspina

Order Corynexochida / Suborder Leiostegiina / Superfamily Leiostegioidea / Family Kaolishaniidae

Jiangshanian (Furongian, Cambrian)Guangxi
Postikaolishania megaspina — photo 1
Photo 1 · Kaolishania. Kaolishania megaspina Zhou, 1977 Holotype of Postikaolishania guangxiensis Restoration (illustrated by Zong Ruiwen; Holotype of Kaolishania megaspina (Guangxi; (1, 2 latex casts of external moulds, 3 internal mould; Guangxi; NIMRF) Zeng Guangchun et al. 2018) Zhu Xuejian 2005) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; 52 Huashi) (Guangxi; Pengcheng Jianke) Complete dorsal exoskeleton (Guangxi; Yuzhao) Complete dorsal exoskeleton (Guangxi; Guodong)
Postikaolishania megaspina — photo 2
Photo 2 · Kaolishania. Kaolishania megaspina Zhou, 1977 Holotype of Postikaolishania guangxiensis Restoration (illustrated by Zong Ruiwen; Holotype of Kaolishania megaspina (Guangxi; (1, 2 latex casts of external moulds, 3 internal mould; Guangxi; NIMRF) Zeng Guangchun et al. 2018) Zhu Xuejian 2005) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; 52 Huashi) (Guangxi; Pengcheng Jianke) Complete dorsal exoskeleton (Guangxi; Yuzhao) Complete dorsal exoskeleton (Guangxi; Guodong)
Postikaolishania megaspina — photo 3
Photo 3 · Kaolishania. Kaolishania megaspina Zhou, 1977 Holotype of Postikaolishania guangxiensis Restoration (illustrated by Zong Ruiwen; Holotype of Kaolishania megaspina (Guangxi; (1, 2 latex casts of external moulds, 3 internal mould; Guangxi; NIMRF) Zeng Guangchun et al. 2018) Zhu Xuejian 2005) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; 52 Huashi) (Guangxi; Pengcheng Jianke) Complete dorsal exoskeleton (Guangxi; Yuzhao) Complete dorsal exoskeleton (Guangxi; Guodong)
Postikaolishania megaspina — photo 4
Photo 4 · Kaolishania. Kaolishania megaspina Zhou, 1977 Holotype of Postikaolishania guangxiensis Restoration (illustrated by Zong Ruiwen; Holotype of Kaolishania megaspina (Guangxi; (1, 2 latex casts of external moulds, 3 internal mould; Guangxi; NIMRF) Zeng Guangchun et al. 2018) Zhu Xuejian 2005) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; 52 Huashi) (Guangxi; Pengcheng Jianke) Complete dorsal exoskeleton (Guangxi; Yuzhao) Complete dorsal exoskeleton (Guangxi; Guodong)
Postikaolishania megaspina — photo 5
Photo 5 · Kaolishania. Kaolishania megaspina Zhou, 1977 Holotype of Postikaolishania guangxiensis Restoration (illustrated by Zong Ruiwen; Holotype of Kaolishania megaspina (Guangxi; (1, 2 latex casts of external moulds, 3 internal mould; Guangxi; NIMRF) Zeng Guangchun et al. 2018) Zhu Xuejian 2005) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; 52 Huashi) (Guangxi; Pengcheng Jianke) Complete dorsal exoskeleton (Guangxi; Yuzhao) Complete dorsal exoskeleton (Guangxi; Guodong)
Postikaolishania megaspina — photo 6
Photo 6 · Kaolishania. Kaolishania megaspina Zhou, 1977 Holotype of Postikaolishania guangxiensis Restoration (illustrated by Zong Ruiwen; Holotype of Kaolishania megaspina (Guangxi; (1, 2 latex casts of external moulds, 3 internal mould; Guangxi; NIMRF) Zeng Guangchun et al. 2018) Zhu Xuejian 2005) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; 52 Huashi) (Guangxi; Pengcheng Jianke) Complete dorsal exoskeleton (Guangxi; Yuzhao) Complete dorsal exoskeleton (Guangxi; Guodong)
Postikaolishania megaspina — photo 7
Photo 7 · Kaolishania. Kaolishania megaspina Zhou, 1977 Holotype of Postikaolishania guangxiensis Restoration (illustrated by Zong Ruiwen; Holotype of Kaolishania megaspina (Guangxi; (1, 2 latex casts of external moulds, 3 internal mould; Guangxi; NIMRF) Zeng Guangchun et al. 2018) Zhu Xuejian 2005) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; 52 Huashi) (Guangxi; Pengcheng Jianke) Complete dorsal exoskeleton (Guangxi; Yuzhao) Complete dorsal exoskeleton (Guangxi; Guodong)
Postikaolishania megaspina — photo 8
Photo 8 · Kaolishania. Kaolishania megaspina Zhou, 1977 Holotype of Postikaolishania guangxiensis Restoration (illustrated by Zong Ruiwen; Holotype of Kaolishania megaspina (Guangxi; (1, 2 latex casts of external moulds, 3 internal mould; Guangxi; NIMRF) Zeng Guangchun et al. 2018) Zhu Xuejian 2005) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; 52 Huashi) (Guangxi; Pengcheng Jianke) Complete dorsal exoskeleton (Guangxi; Yuzhao) Complete dorsal exoskeleton (Guangxi; Guodong)
Classification
Order Corynexochida / Suborder Leiostegiina / Superfamily Leiostegioidea / Family Kaolishaniidae
Genus
Postikaolishania Zhu, MS., 2005
Genus author
Zhu Xuejian (doctoral dissertation)
Genus etymology
post, Latin, after; Kaolishania, a trilobite genus name. Named for being similar to but occurring later than
Species
P. megaspina (Zhou in Zhou et al., 1977)
Species author
Zhou Tianmei
Species etymology
mega-, Greek, large; spina, Latin, spine. Probably referring to the pair of large lateral spines on the pygidium.
Age
Jiangshanian (Furongian, Cambrian)
Distribution
Guangxi
Synonyms
Kaolishania megaspina; Postikaolishania guangxiensis
Diagnosis
Dorsal shield elongate-elliptical. Cephalon semi-elliptical; glabella strongly convex, slightly constricted anteriorly, with 4 pairs of glabellar furrows; dorsal furrows wide and deep; occipital furrow wide and shallow; occipital ring straight with a faint median node; palpebral lobes large and convex, arcuate and extending backward with uniform width; eye ridges faint or absent; eye furrow distinct; fixigenae narrow; anterior border wide and strongly convex; preglabellar field faint or absent; librigenae wide with long and stout genal spines. Thorax of 10 segments; axis tapering slowly backward; pleurae slightly wider than the axis, pleural furrows wide and deep, pleural spines lengthening posteriorly. Pygidium triangular apart from marginal spines; axis with 5-6 rings plus a terminal piece, tapering rapidly backward; posterior border wide; marginal spines long and stout.
Remarks
Postikaolishania guangxiensis in Zhu Xuejian's doctoral dissertation (2005) is conspecific with Kaolishania megaspina erected by Zhou Tianmei (1977).