Phacopida

Hadromeros xiushanensis

Order Phacopida / Suborder Cheirurina / Superfamily Cheiruroidea / Family Cheiruridae

Katian (Late Ordovician)Chongqing, Sichuan, Shaanxi, Hunan, Yunnan

Hadromeros xiushanensis — photo 1 — Photo 1 · Lectotype GMC3735 (Chongqing; Sheng Xinfu Literature specimen (Hunan; Zhou Zhiqiang Enrolled dorsal exoskeleton (Yunnan; 1964) et al. 2016) Tuyang Tuseng Po) Literature specimen (Shaanxi; Zhou Zhiqiang et al. 2016) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Yunnan; Fangquan Panghu) (Yunnan; Jianxiang sean) (Yunnan; Lixia)

Hadromeros xiushanensis — photo 2 — Photo 2 · Lectotype GMC3735 (Chongqing; Sheng Xinfu Literature specimen (Hunan; Zhou Zhiqiang Enrolled dorsal exoskeleton (Yunnan; 1964) et al. 2016) Tuyang Tuseng Po) Literature specimen (Shaanxi; Zhou Zhiqiang et al. 2016) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Yunnan; Fangquan Panghu) (Yunnan; Jianxiang sean) (Yunnan; Lixia)

Hadromeros xiushanensis — photo 3 — Photo 3 · Lectotype GMC3735 (Chongqing; Sheng Xinfu Literature specimen (Hunan; Zhou Zhiqiang Enrolled dorsal exoskeleton (Yunnan; 1964) et al. 2016) Tuyang Tuseng Po) Literature specimen (Shaanxi; Zhou Zhiqiang et al. 2016) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Yunnan; Fangquan Panghu) (Yunnan; Jianxiang sean) (Yunnan; Lixia)

Hadromeros xiushanensis — photo 4 — Photo 4 · Lectotype GMC3735 (Chongqing; Sheng Xinfu Literature specimen (Hunan; Zhou Zhiqiang Enrolled dorsal exoskeleton (Yunnan; 1964) et al. 2016) Tuyang Tuseng Po) Literature specimen (Shaanxi; Zhou Zhiqiang et al. 2016) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Yunnan; Fangquan Panghu) (Yunnan; Jianxiang sean) (Yunnan; Lixia)

Hadromeros xiushanensis — photo 5 — Photo 5 · Lectotype GMC3735 (Chongqing; Sheng Xinfu Literature specimen (Hunan; Zhou Zhiqiang Enrolled dorsal exoskeleton (Yunnan; 1964) et al. 2016) Tuyang Tuseng Po) Literature specimen (Shaanxi; Zhou Zhiqiang et al. 2016) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Yunnan; Fangquan Panghu) (Yunnan; Jianxiang sean) (Yunnan; Lixia)

Hadromeros xiushanensis — photo 6 — Photo 6 · Lectotype GMC3735 (Chongqing; Sheng Xinfu Literature specimen (Hunan; Zhou Zhiqiang Enrolled dorsal exoskeleton (Yunnan; 1964) et al. 2016) Tuyang Tuseng Po) Literature specimen (Shaanxi; Zhou Zhiqiang et al. 2016) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Yunnan; Fangquan Panghu) (Yunnan; Jianxiang sean) (Yunnan; Lixia)

Hadromeros xiushanensis — photo 7 — Photo 7 · Lectotype GMC3735 (Chongqing; Sheng Xinfu Literature specimen (Hunan; Zhou Zhiqiang Enrolled dorsal exoskeleton (Yunnan; 1964) et al. 2016) Tuyang Tuseng Po) Literature specimen (Shaanxi; Zhou Zhiqiang et al. 2016) Complete dorsal exoskeleton Complete dorsal exoskeleton Complete dorsal exoskeleton (Yunnan; Fangquan Panghu) (Yunnan; Jianxiang sean) (Yunnan; Lixia)

Classification

Order Phacopida / Suborder Cheirurina / Superfamily Cheiruroidea / Family Cheiruridae

Genus

Hadromeros Lane, 1971

Genus author

Lane P. D.

Genus etymology

hadr-, Greek, stout, bulky; mer-, Greek, part, thigh

Species

H. xiushanensis (Sheng, 1964)

Species author

Sheng Xinfu

Species etymology

Xiushan, Xiushan, Chongqing

Age

Katian (Late Ordovician)

Distribution

Chongqing, Sichuan, Shaanxi, Hunan, Yunnan

Synonyms

Eccoptochile ? xiushanensis; Parisoceraurus latilimbatus; Paraceraurus xiushanensis; P. tetragonalis; Hadromeros latilimbatus

Diagnosis

Glabella gently convex with three pairs of deep glabellar furrows, S1 curved inward-backward, S2 and S3 parallel, anterior lobe subsemicircular; occipital ring protruding forward medially; fixigenae wide; palpebral lobes small; genal spines long. Thorax of 11 segments; axis narrower than pleurae; each pleura divided by a longitudinal furrow parallel to the axial furrow into two parts, the adaxial part rhomboidal with the pleural furrow on the diagonal, the abaxial part recurved into a pleural spine. Pygidial axis convex, conical, of 3 axial rings plus a terminal piece; three pleural ribs on each side, the first pleural segment especially wide and long, extended into very long pygidial spines, the second and third pairs of spines small.