Ptychopariida

Prodamesella convexa

Order Ptychopariida / Suborder Ptychopariina / Superfamily Ptychoparioidea / Family Lonchocephalidae

Drumian (Miaolingian, Cambrian)Shandong

Prodamesella convexa — photo 1 — Photo 1 · First complete dorsal exoskeleton (Shandong; Slab with complete dorsal Tang Yonggang et al. 2014) exoskeletons (Shandong; L.Y) Type specimen NIGP9296 (Shandong) (upper: Yuan Jinliang et al. 2012; lower: Zhang Wentang 1959) Complete dorsal Complete dorsal exoskeleton exoskeleton (Shandong; (Shandong; Guodong) Baishui)

Prodamesella convexa — photo 2 — Photo 2 · First complete dorsal exoskeleton (Shandong; Slab with complete dorsal Tang Yonggang et al. 2014) exoskeletons (Shandong; L.Y) Type specimen NIGP9296 (Shandong) (upper: Yuan Jinliang et al. 2012; lower: Zhang Wentang 1959) Complete dorsal Complete dorsal exoskeleton exoskeleton (Shandong; (Shandong; Guodong) Baishui)

Prodamesella convexa — photo 3 — Photo 3 · First complete dorsal exoskeleton (Shandong; Slab with complete dorsal Tang Yonggang et al. 2014) exoskeletons (Shandong; L.Y) Type specimen NIGP9296 (Shandong) (upper: Yuan Jinliang et al. 2012; lower: Zhang Wentang 1959) Complete dorsal Complete dorsal exoskeleton exoskeleton (Shandong; (Shandong; Guodong) Baishui)

Prodamesella convexa — photo 4 — Photo 4 · First complete dorsal exoskeleton (Shandong; Slab with complete dorsal Tang Yonggang et al. 2014) exoskeletons (Shandong; L.Y) Type specimen NIGP9296 (Shandong) (upper: Yuan Jinliang et al. 2012; lower: Zhang Wentang 1959) Complete dorsal Complete dorsal exoskeleton exoskeleton (Shandong; (Shandong; Guodong) Baishui)

Prodamesella convexa — photo 5 — Photo 5 · First complete dorsal exoskeleton (Shandong; Slab with complete dorsal Tang Yonggang et al. 2014) exoskeletons (Shandong; L.Y) Type specimen NIGP9296 (Shandong) (upper: Yuan Jinliang et al. 2012; lower: Zhang Wentang 1959) Complete dorsal Complete dorsal exoskeleton exoskeleton (Shandong; (Shandong; Guodong) Baishui)

Prodamesella convexa — photo 6 — Photo 6 · First complete dorsal exoskeleton (Shandong; Slab with complete dorsal Tang Yonggang et al. 2014) exoskeletons (Shandong; L.Y) Type specimen NIGP9296 (Shandong) (upper: Yuan Jinliang et al. 2012; lower: Zhang Wentang 1959) Complete dorsal Complete dorsal exoskeleton exoskeleton (Shandong; (Shandong; Guodong) Baishui)

Prodamesella convexa — photo 7 — Photo 7 · First complete dorsal exoskeleton (Shandong; Slab with complete dorsal Tang Yonggang et al. 2014) exoskeletons (Shandong; L.Y) Type specimen NIGP9296 (Shandong) (upper: Yuan Jinliang et al. 2012; lower: Zhang Wentang 1959) Complete dorsal Complete dorsal exoskeleton exoskeleton (Shandong; (Shandong; Guodong) Baishui)

Prodamesella convexa — photo 8 — Photo 8 · First complete dorsal exoskeleton (Shandong; Slab with complete dorsal Tang Yonggang et al. 2014) exoskeletons (Shandong; L.Y) Type specimen NIGP9296 (Shandong) (upper: Yuan Jinliang et al. 2012; lower: Zhang Wentang 1959) Complete dorsal Complete dorsal exoskeleton exoskeleton (Shandong; (Shandong; Guodong) Baishui)

Classification

Order Ptychopariida / Suborder Ptychopariina / Superfamily Ptychoparioidea / Family Lonchocephalidae

Genus

Prodamesella Chang, 1959

Genus author

Zhang Wentang

Genus etymology

pro-, before, forward; Damesella, a trilobite genus name

Species

P. convexa Chang, 1959

Species author

Zhang Wentang

Species etymology

convexa, Latin, convex

Age

Drumian (Miaolingian, Cambrian)

Distribution

Shandong

Diagnosis

Dorsal shield long-ovate, surface with dense small pits or nodes. Cranidium broad-trapezoidal; glabella long, truncate-conical, with 3 pairs of short, deep lateral glabellar furrows; preglabellar field narrow and depressed or absent; anterior border rather narrow and slightly upturned; fixigenae wide in the palpebral area; palpebral lobes small; eye ridges long; librigenae narrow with short genal spines. Thorax of 12 segments; axis subequal in width to pleurae; pleural furrows wide and deep, pleural spines short, entire margin serrated. Pygidium short and transversely wide, rhomboidal; axis short, inverted-conical; border extremely narrow.

Remarks

This species is the type species of the genus Prodamesella. The first complete dorsal exoskeleton was discovered by Zuoshanling (Tang Yonggang), a fossil enthusiast from Shandong.