Corynexochida

Blackwelderia paronai

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

Guzhangian (Miaolingian, Cambrian)Shandong, Northeast China and other parts of North China

Blackwelderia paronai — photo 1 — Photo 1 · specimens Early literature specimen (Shandong; Walcott 1913) Cephalon and pygidium specimen (Hebei; Leile Xixie) Complete dorsal exoskeleton (Shandong; Xinghuanhao Complete dorsal exoskeleton (Shandong; Aozi) Designer) (Shandong; Qiufeng Baise)

Blackwelderia paronai — photo 2 — Photo 2 · specimens Early literature specimen (Shandong; Walcott 1913) Cephalon and pygidium specimen (Hebei; Leile Xixie) Complete dorsal exoskeleton (Shandong; Xinghuanhao Complete dorsal exoskeleton (Shandong; Aozi) Designer) (Shandong; Qiufeng Baise)

Blackwelderia paronai — photo 3 — Photo 3 · specimens Early literature specimen (Shandong; Walcott 1913) Cephalon and pygidium specimen (Hebei; Leile Xixie) Complete dorsal exoskeleton (Shandong; Xinghuanhao Complete dorsal exoskeleton (Shandong; Aozi) Designer) (Shandong; Qiufeng Baise)

Blackwelderia paronai — photo 4 — Photo 4 · specimens Early literature specimen (Shandong; Walcott 1913) Cephalon and pygidium specimen (Hebei; Leile Xixie) Complete dorsal exoskeleton (Shandong; Xinghuanhao Complete dorsal exoskeleton (Shandong; Aozi) Designer) (Shandong; Qiufeng Baise)

Blackwelderia paronai — photo 5 — Photo 5 · specimens Early literature specimen (Shandong; Walcott 1913) Cephalon and pygidium specimen (Hebei; Leile Xixie) Complete dorsal exoskeleton (Shandong; Xinghuanhao Complete dorsal exoskeleton (Shandong; Aozi) Designer) (Shandong; Qiufeng Baise)

Blackwelderia paronai — photo 6 — Photo 6 · specimens Early literature specimen (Shandong; Walcott 1913) Cephalon and pygidium specimen (Hebei; Leile Xixie) Complete dorsal exoskeleton (Shandong; Xinghuanhao Complete dorsal exoskeleton (Shandong; Aozi) Designer) (Shandong; Qiufeng Baise)

Blackwelderia paronai — photo 7 — Photo 7 · specimens Early literature specimen (Shandong; Walcott 1913) Cephalon and pygidium specimen (Hebei; Leile Xixie) Complete dorsal exoskeleton (Shandong; Xinghuanhao Complete dorsal exoskeleton (Shandong; Aozi) Designer) (Shandong; Qiufeng Baise)

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

B. paronai (Airaghi, 1902)

Species author

Airaghi C.

Species etymology

parona, Parona, a surname

Age

Guzhangian (Miaolingian, Cambrian)

Distribution

Shandong, Northeast China and other parts of North China

Synonyms

Olenoides paronai; Olenoides cilix; Blackwelderia cilix; Blackwelderia sola

Diagnosis

Cranidium subtrapezoidal; glabella truncate-conical, slightly constricted anteriorly, with three pairs of glabellar furrows, S3 shallow and faint, S1 deep and wide, running obliquely inward and backward; occipital ring wide medially, narrowing laterally; occipital furrow wide and deep laterally; fixigenae medium-wide; eye ridges oblique; palpebral lobes small, opposite the middle of the glabella; preglabellar field large, anterior border narrow and upturned; librigenae transversely wide and longitudinally narrow, with a short spine at the intergenal angle, genal spines of medium length. Thorax of 12 segments, axis narrower than pleurae, tapering gradually; pleural furrows wide and deep, pleural spines acute. Pygidium inverted-triangular; axis conical with rounded posterior end, with 5 axial rings and a terminal piece; pleural furrows wide and deep; 7 pairs of pygidial spines, the sixth pair stouter and longer.