Ptychopariida

Liostracina fuluensis

Order Ptychopariida / Suborder Ptychopariina / Superfamily Liostracinoidea / Family Liostracinidae

Guzhangian (Miaolingian, Cambrian)Yunnan

Liostracina fuluensis — photo 1 — Photo 1 · E. et al. Type specimen figures (external mould and its latex cast; Yunnan; Yang et Restorations of dorsal al., 2022) and ventral surfaces (Yang et al., 2022) Literature specimen figures (Yunnan; Yang et al., 2022)

Liostracina fuluensis — photo 2 — Photo 2 · E. et al. Type specimen figures (external mould and its latex cast; Yunnan; Yang et Restorations of dorsal al., 2022) and ventral surfaces (Yang et al., 2022) Literature specimen figures (Yunnan; Yang et al., 2022)

Liostracina fuluensis — photo 3 — Photo 3 · E. et al. Type specimen figures (external mould and its latex cast; Yunnan; Yang et Restorations of dorsal al., 2022) and ventral surfaces (Yang et al., 2022) Literature specimen figures (Yunnan; Yang et al., 2022)

Liostracina fuluensis — photo 4 — Photo 4 · E. et al. Type specimen figures (external mould and its latex cast; Yunnan; Yang et Restorations of dorsal al., 2022) and ventral surfaces (Yang et al., 2022) Literature specimen figures (Yunnan; Yang et al., 2022)

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. fuluensis Yang, Peng, Babcock et al., 2022

Species author

Yang Xianfeng, Peng Shanchi, Babcock L.

Species etymology

Fulu, Fulu Village, Funing, Yunnan, the locality

Age

Guzhangian (Miaolingian, Cambrian)

Distribution

Yunnan

Diagnosis

Dorsal shield subcircular, largely smooth. Cephalon large, semicircular, occupying almost half the body length; glabella moderately convex with subparallel sides and rounded front, three pairs of glabellar furrows; occipital ring wide, occipital node occasionally visible; anterior median glabellar furrow incomplete; anterior border convex; anterior border furrow shallow and wide; fixigenae wide; eyes medium-sized; eye ridges distinct; posterior border furrow deep; anterior branches of facial sutures first diverging then curving inward-forward; posterior branches short; librigenae wide with wide, long genal spines; cephalic doublure wide; rostral plate subtrapezoidal; conterminant hypostome, shield-shaped. Thorax of 8 segments; axis narrow; anterior four pleural segments with pleural spines and articulating facets; pleural furrows shallow and wide. Pygidium short and wide, subtriangular; axis conical with three axial rings and a terminal lobe; pleural furrows transverse; border narrow and convex.