Ptychopariida

Liostracina tangwangzhaiensis

Order Ptychopariida / Suborder Ptychopariina / Superfamily Liostracinoidea / Family Liostracinidae

Guzhangian (Miaolingian, Cambrian)Shandong

Liostracina tangwangzhaiensis — photo 1 — Photo 1 · Holotype GSNM-3962-002 (Shandong; Park et al., 2014) Enrolled specimen Complete dorsal exoskeleton (Shandong; L.Y) (Shandong; Baishui)

Liostracina tangwangzhaiensis — photo 2 — Photo 2 · Holotype GSNM-3962-002 (Shandong; Park et al., 2014) Enrolled specimen Complete dorsal exoskeleton (Shandong; L.Y) (Shandong; Baishui)

Liostracina tangwangzhaiensis — photo 3 — Photo 3 · Holotype GSNM-3962-002 (Shandong; Park et al., 2014) Enrolled specimen Complete dorsal exoskeleton (Shandong; L.Y) (Shandong; Baishui)

Liostracina tangwangzhaiensis — photo 4 — Photo 4 · Holotype GSNM-3962-002 (Shandong; Park et al., 2014) Enrolled specimen Complete dorsal exoskeleton (Shandong; L.Y) (Shandong; Baishui)

Liostracina tangwangzhaiensis — photo 5 — Photo 5 · Holotype GSNM-3962-002 (Shandong; Park et al., 2014) Enrolled specimen Complete dorsal exoskeleton (Shandong; L.Y) (Shandong; Baishui)

Classification

Order Ptychopariida / Suborder Ptychopariina / Superfamily Liostracinoidea / Family Liostracinidae

Genus

Liostracina Monke, 1903

Genus author

Monke H.

Genus etymology

lio-, smooth; ostrac-, Greek, shell

Species

L. tangwangzhaiensis Park, Kihm, Kang & Choi, 2014

Species author

Park T.-Y. S., Kihm J.-H., Kang I. & Choi D. K.

Species etymology

Tangwangzhai, Tangwangzhai, Shandong, locality of the type specimens

Age

Guzhangian (Miaolingian, Cambrian)

Distribution

Shandong

Diagnosis

Dorsal shield smooth. Cephalon semicircular; cranidium strongly convex; glabella subcylindrical with pointed front and three pairs of faint glabellar furrows; occipital ring wide with a small occipital node; anterior median glabellar furrow incomplete; anterior border wide; fixigenae wide; eyes small; eye ridges faint; librigenae with wide, long genal spines. Thorax of 8 segments; axis narrow. Pygidium short and wide, subtriangular; axis conical; border narrow and convex.