Corynexochida

Metarthricocephalus spinosus

Order Corynexochida / Suborder Corynexochina / Family Oryctocephalidae / Family Oryctocephalinae

Cambrian, Miaolingian, WuliuanGuizhou

Metarthricocephalus spinosus — photo 1 — Photo 1 · met, Greek, after, behind; Arthricocephalus, a trilobite genus name Holotype GK6008 (Guizhou; Yuan Jinliang et (Guizhou; Yuan al. 2002) Jinliang et al. 2002) (Guizhou; Yuan Jinliang et al. (Guizhou; Lixia) 2002)

Metarthricocephalus spinosus — photo 2 — Photo 2 · met, Greek, after, behind; Arthricocephalus, a trilobite genus name Holotype GK6008 (Guizhou; Yuan Jinliang et (Guizhou; Yuan al. 2002) Jinliang et al. 2002) (Guizhou; Yuan Jinliang et al. (Guizhou; Lixia) 2002)

Metarthricocephalus spinosus — photo 3 — Photo 3 · met, Greek, after, behind; Arthricocephalus, a trilobite genus name Holotype GK6008 (Guizhou; Yuan Jinliang et (Guizhou; Yuan al. 2002) Jinliang et al. 2002) (Guizhou; Yuan Jinliang et al. (Guizhou; Lixia) 2002)

Metarthricocephalus spinosus — photo 4 — Photo 4 · met, Greek, after, behind; Arthricocephalus, a trilobite genus name Holotype GK6008 (Guizhou; Yuan Jinliang et (Guizhou; Yuan al. 2002) Jinliang et al. 2002) (Guizhou; Yuan Jinliang et al. (Guizhou; Lixia) 2002)

Metarthricocephalus spinosus — photo 5 — Photo 5 · met, Greek, after, behind; Arthricocephalus, a trilobite genus name Holotype GK6008 (Guizhou; Yuan Jinliang et (Guizhou; Yuan al. 2002) Jinliang et al. 2002) (Guizhou; Yuan Jinliang et al. (Guizhou; Lixia) 2002)

Metarthricocephalus spinosus — photo 6 — Photo 6 · met, Greek, after, behind; Arthricocephalus, a trilobite genus name Holotype GK6008 (Guizhou; Yuan Jinliang et (Guizhou; Yuan al. 2002) Jinliang et al. 2002) (Guizhou; Yuan Jinliang et al. (Guizhou; Lixia) 2002)

Classification

Order Corynexochida / Suborder Corynexochina / Family Oryctocephalidae / Family Oryctocephalinae

Genus

Metarthricocephalus Zhao & Yuan in Yuan et al.,

Genus author

Zhao Yuanlong, Yuan Jinliang

Genus etymology

2002

Species

M. spinosus Zhao & Yuan in Yuan et al., 2002

Species author

Zhao Yuanlong, Yuan Jinliang

Species etymology

spinosus, spiny, probably referring to the genal, pleural and pygidial spines

Age

Cambrian, Miaolingian, Wuliuan

Distribution

Guizhou

Diagnosis

Opisthoparian micropygous trilobite. Glabella suboval, inflated outward medially, bounded laterally by undulating dorsal furrows, anterior end flatly rounded, reaching the anterior border furrow; Four pairs of glabellar furrows, pit-like Like, S1 and S2 connected by shallow transverse furrow; Palpebral lobe of moderate length, located at the middle of the cranidium; Ocular area of fixed cheek relatively broad, free cheek with short, slender genal spines. Thorax of 12 segments, with posterior curved claw-like pleural spines. Pygidium small and transversely broad, with three pairs of short small marginal spines; axis narrow, of 2 rings and 1 terminal piece, posterior margin a broad arc concave forward

Remarks

This species is the type species of Metarthricocephalus.