Corynexochida

Blackwelderia sp. 2

Order Corynexochida / Suborder Leiostegiina / Superfamily Dameselloidea / Family Damesellidae / Subfamily Damesellinae

Guzhangian (Miaolingian, Cambrian)Shandong
Blackwelderia sp. 2 — photo 1
Photo 1 · specimens Restoration Complete dorsal exoskeleton Complete dorsal exoskeleton (illustrated by (Shandong; Guodong) (Shandong; Liangliang Fengqing) Haixiang) (Shandong; Xinghuanhao Hypostome (Shandong; Enrolled specimen (Shandong; Pleural and pygidial spines with denticles (Shandong; Gao Baishui) Yicheng) (Shandong; Teacher Shao) Zishuo) Designer) Complete dorsal exoskeleton Complete dorsal exoskeleton Librigenae and pleural spines with denticles (Shandong; Liu Qing) (Shandong; Xixi) (Shandong; Pengcheng Jianke)
Blackwelderia sp. 2 — photo 2
Photo 2 · specimens Restoration Complete dorsal exoskeleton Complete dorsal exoskeleton (illustrated by (Shandong; Guodong) (Shandong; Liangliang Fengqing) Haixiang) (Shandong; Xinghuanhao Hypostome (Shandong; Enrolled specimen (Shandong; Pleural and pygidial spines with denticles (Shandong; Gao Baishui) Yicheng) (Shandong; Teacher Shao) Zishuo) Designer) Complete dorsal exoskeleton Complete dorsal exoskeleton Librigenae and pleural spines with denticles (Shandong; Liu Qing) (Shandong; Xixi) (Shandong; Pengcheng Jianke)
Blackwelderia sp. 2 — photo 3
Photo 3 · specimens Restoration Complete dorsal exoskeleton Complete dorsal exoskeleton (illustrated by (Shandong; Guodong) (Shandong; Liangliang Fengqing) Haixiang) (Shandong; Xinghuanhao Hypostome (Shandong; Enrolled specimen (Shandong; Pleural and pygidial spines with denticles (Shandong; Gao Baishui) Yicheng) (Shandong; Teacher Shao) Zishuo) Designer) Complete dorsal exoskeleton Complete dorsal exoskeleton Librigenae and pleural spines with denticles (Shandong; Liu Qing) (Shandong; Xixi) (Shandong; Pengcheng Jianke)
Blackwelderia sp. 2 — photo 4
Photo 4 · specimens Restoration Complete dorsal exoskeleton Complete dorsal exoskeleton (illustrated by (Shandong; Guodong) (Shandong; Liangliang Fengqing) Haixiang) (Shandong; Xinghuanhao Hypostome (Shandong; Enrolled specimen (Shandong; Pleural and pygidial spines with denticles (Shandong; Gao Baishui) Yicheng) (Shandong; Teacher Shao) Zishuo) Designer) Complete dorsal exoskeleton Complete dorsal exoskeleton Librigenae and pleural spines with denticles (Shandong; Liu Qing) (Shandong; Xixi) (Shandong; Pengcheng Jianke)
Blackwelderia sp. 2 — photo 5
Photo 5 · specimens Restoration Complete dorsal exoskeleton Complete dorsal exoskeleton (illustrated by (Shandong; Guodong) (Shandong; Liangliang Fengqing) Haixiang) (Shandong; Xinghuanhao Hypostome (Shandong; Enrolled specimen (Shandong; Pleural and pygidial spines with denticles (Shandong; Gao Baishui) Yicheng) (Shandong; Teacher Shao) Zishuo) Designer) Complete dorsal exoskeleton Complete dorsal exoskeleton Librigenae and pleural spines with denticles (Shandong; Liu Qing) (Shandong; Xixi) (Shandong; Pengcheng Jianke)
Blackwelderia sp. 2 — photo 6
Photo 6 · specimens Restoration Complete dorsal exoskeleton Complete dorsal exoskeleton (illustrated by (Shandong; Guodong) (Shandong; Liangliang Fengqing) Haixiang) (Shandong; Xinghuanhao Hypostome (Shandong; Enrolled specimen (Shandong; Pleural and pygidial spines with denticles (Shandong; Gao Baishui) Yicheng) (Shandong; Teacher Shao) Zishuo) Designer) Complete dorsal exoskeleton Complete dorsal exoskeleton Librigenae and pleural spines with denticles (Shandong; Liu Qing) (Shandong; Xixi) (Shandong; Pengcheng Jianke)
Blackwelderia sp. 2 — photo 7
Photo 7 · specimens Restoration Complete dorsal exoskeleton Complete dorsal exoskeleton (illustrated by (Shandong; Guodong) (Shandong; Liangliang Fengqing) Haixiang) (Shandong; Xinghuanhao Hypostome (Shandong; Enrolled specimen (Shandong; Pleural and pygidial spines with denticles (Shandong; Gao Baishui) Yicheng) (Shandong; Teacher Shao) Zishuo) Designer) Complete dorsal exoskeleton Complete dorsal exoskeleton Librigenae and pleural spines with denticles (Shandong; Liu Qing) (Shandong; Xixi) (Shandong; Pengcheng Jianke)
Blackwelderia sp. 2 — photo 8
Photo 8 · specimens Restoration Complete dorsal exoskeleton Complete dorsal exoskeleton (illustrated by (Shandong; Guodong) (Shandong; Liangliang Fengqing) Haixiang) (Shandong; Xinghuanhao Hypostome (Shandong; Enrolled specimen (Shandong; Pleural and pygidial spines with denticles (Shandong; Gao Baishui) Yicheng) (Shandong; Teacher Shao) Zishuo) Designer) Complete dorsal exoskeleton Complete dorsal exoskeleton Librigenae and pleural spines with denticles (Shandong; Liu Qing) (Shandong; Xixi) (Shandong; Pengcheng Jianke)
Blackwelderia sp. 2 — photo 9
Photo 9 · specimens Restoration Complete dorsal exoskeleton Complete dorsal exoskeleton (illustrated by (Shandong; Guodong) (Shandong; Liangliang Fengqing) Haixiang) (Shandong; Xinghuanhao Hypostome (Shandong; Enrolled specimen (Shandong; Pleural and pygidial spines with denticles (Shandong; Gao Baishui) Yicheng) (Shandong; Teacher Shao) Zishuo) Designer) Complete dorsal exoskeleton Complete dorsal exoskeleton Librigenae and pleural spines with denticles (Shandong; Liu Qing) (Shandong; Xixi) (Shandong; Pengcheng Jianke)
Blackwelderia sp. 2 — photo 10
Photo 10 · specimens Restoration Complete dorsal exoskeleton Complete dorsal exoskeleton (illustrated by (Shandong; Guodong) (Shandong; Liangliang Fengqing) Haixiang) (Shandong; Xinghuanhao Hypostome (Shandong; Enrolled specimen (Shandong; Pleural and pygidial spines with denticles (Shandong; Gao Baishui) Yicheng) (Shandong; Teacher Shao) Zishuo) Designer) Complete dorsal exoskeleton Complete dorsal exoskeleton Librigenae and pleural spines with denticles (Shandong; Liu Qing) (Shandong; Xixi) (Shandong; Pengcheng Jianke)
Blackwelderia sp. 2 — photo 11
Photo 11 · specimens Restoration Complete dorsal exoskeleton Complete dorsal exoskeleton (illustrated by (Shandong; Guodong) (Shandong; Liangliang Fengqing) Haixiang) (Shandong; Xinghuanhao Hypostome (Shandong; Enrolled specimen (Shandong; Pleural and pygidial spines with denticles (Shandong; Gao Baishui) Yicheng) (Shandong; Teacher Shao) Zishuo) Designer) Complete dorsal exoskeleton Complete dorsal exoskeleton Librigenae and pleural spines with denticles (Shandong; Liu Qing) (Shandong; Xixi) (Shandong; Pengcheng Jianke)
Classification
Order Corynexochida / Suborder Leiostegiina / Superfamily Dameselloidea / Family Damesellidae / Subfamily Damesellinae
Genus
Blackwelderia Walcott, 1906
Genus author
Walcott C. D.
Genus etymology
Blackwelder, a surname, referring to E. Blackwelder, an early-20th-century collector of North China trilobite
Species
Blackwelderia sp. 2
Species author
/
Species etymology
/
Age
Guzhangian (Miaolingian, Cambrian)
Distribution
Shandong
Diagnosis
Dorsal shield verrucose. Cranidium wide; glabella conical with four pairs of glabellar furrows, L1 slightly inverted V-shaped; occipital ring with a median node; palpebral lobes convex; preglabellar field depressed; anterior border narrow and upturned; librigenae with long genal spines bearing denticles. Thorax of 12 segments; axis slightly narrower than pleurae; pleural furrows transverse, pleural spines long with denticles. Pygidium triangular apart from spines; axis long-conical; border narrow with 7 pairs of spines of different lengths, the first and sixth pairs longest, all bearing denticles.
Remarks
This species occurs in the Damesella paronai Zone and may be the earliest member of the genus Blackwelderia.