Ptychopariida

Hewenia anacantha

Order Ptychopariida / Suborder Ptychopariina / Superfamily Ptychoparioidea / Family Eulomidae

Jiangshanian (Furongian, Cambrian)Guangxi
Hewenia anacantha — photo 1
Photo 1 · Type specimen (Guangxi; Zhu Xuejian Restoration (illustrated by Zong Specimen preserving a complete hypostome (Guangxi; Xiong 2005) Ruiwen; Zeng Guangchun et al. 2018) Duo et al. 2015) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Xuanling) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Baishui) (Guangxi; Qianli Zhijiang) Literature specimen (Guangxi; Xiong Duo et al. 2015)
Hewenia anacantha — photo 2
Photo 2 · Type specimen (Guangxi; Zhu Xuejian Restoration (illustrated by Zong Specimen preserving a complete hypostome (Guangxi; Xiong 2005) Ruiwen; Zeng Guangchun et al. 2018) Duo et al. 2015) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Xuanling) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Baishui) (Guangxi; Qianli Zhijiang) Literature specimen (Guangxi; Xiong Duo et al. 2015)
Hewenia anacantha — photo 3
Photo 3 · Type specimen (Guangxi; Zhu Xuejian Restoration (illustrated by Zong Specimen preserving a complete hypostome (Guangxi; Xiong 2005) Ruiwen; Zeng Guangchun et al. 2018) Duo et al. 2015) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Xuanling) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Baishui) (Guangxi; Qianli Zhijiang) Literature specimen (Guangxi; Xiong Duo et al. 2015)
Hewenia anacantha — photo 4
Photo 4 · Type specimen (Guangxi; Zhu Xuejian Restoration (illustrated by Zong Specimen preserving a complete hypostome (Guangxi; Xiong 2005) Ruiwen; Zeng Guangchun et al. 2018) Duo et al. 2015) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Xuanling) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Baishui) (Guangxi; Qianli Zhijiang) Literature specimen (Guangxi; Xiong Duo et al. 2015)
Hewenia anacantha — photo 5
Photo 5 · Type specimen (Guangxi; Zhu Xuejian Restoration (illustrated by Zong Specimen preserving a complete hypostome (Guangxi; Xiong 2005) Ruiwen; Zeng Guangchun et al. 2018) Duo et al. 2015) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Xuanling) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Baishui) (Guangxi; Qianli Zhijiang) Literature specimen (Guangxi; Xiong Duo et al. 2015)
Hewenia anacantha — photo 6
Photo 6 · Type specimen (Guangxi; Zhu Xuejian Restoration (illustrated by Zong Specimen preserving a complete hypostome (Guangxi; Xiong 2005) Ruiwen; Zeng Guangchun et al. 2018) Duo et al. 2015) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Xuanling) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Baishui) (Guangxi; Qianli Zhijiang) Literature specimen (Guangxi; Xiong Duo et al. 2015)
Hewenia anacantha — photo 7
Photo 7 · Type specimen (Guangxi; Zhu Xuejian Restoration (illustrated by Zong Specimen preserving a complete hypostome (Guangxi; Xiong 2005) Ruiwen; Zeng Guangchun et al. 2018) Duo et al. 2015) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Xuanling) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Baishui) (Guangxi; Qianli Zhijiang) Literature specimen (Guangxi; Xiong Duo et al. 2015)
Hewenia anacantha — photo 8
Photo 8 · Type specimen (Guangxi; Zhu Xuejian Restoration (illustrated by Zong Specimen preserving a complete hypostome (Guangxi; Xiong 2005) Ruiwen; Zeng Guangchun et al. 2018) Duo et al. 2015) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Guodong) (Guangxi; Xuanling) Complete dorsal exoskeleton Complete dorsal exoskeleton (Guangxi; Baishui) (Guangxi; Qianli Zhijiang) Literature specimen (Guangxi; Xiong Duo et al. 2015)
Classification
Order Ptychopariida / Suborder Ptychopariina / Superfamily Ptychoparioidea / Family Eulomidae
Genus
Hewenia Zhou, 1977
Genus author
Zhou Tianmei
Genus etymology
Hewen, Hewen Village, Jingxi, Guangxi, type locality of the type species
Species
H. anacantha Zhu, MS., 2005
Species author
Zhu Xuejian (doctoral dissertation)
Species etymology
anacanthus, Latin, spineless, referring to the small or absent genal spines of this species
Age
Jiangshanian (Furongian, Cambrian)
Distribution
Guangxi
Diagnosis
Opisthoparian micropygous trilobite with ovate, smooth dorsal shield. Cephalon relatively wide and flat; glabella moderately convex, truncate-conical; dorsal furrows deep; two pairs of glabellar furrows arranged in an inverted V, S1 long, inclined inward, S2 shorter; anterior border wider medially, narrowing laterally; preglabellar field rather wide; occipital furrow distinct, curved forward at both ends; occipital ring slightly arched forward medially; palpebral lobes crescent- shaped, rather large, nearly parallel to the lateral margins of the glabella; fixigenae slightly narrow; librigenae wide with blunt, spineless genal angles. Thorax of 11-12 segments, axis tapering backward; pleurae slightly wider than the axis, pleural furrows wide and deep, pleural spines absent. Pygidium elliptical to olive-shaped; axis divided into two rings and a rather rounded terminal piece.