Ptychopariida

Hypermecaspis asiatica

Order Ptychopariida / Suborder Olenina / Family Hypermecaspididae

Tremadocian (Early Ordovician)Zhejiang

Hypermecaspis asiatica — photo 1 — Photo 1 · Holotype TK031 (Zhejiang; Han Nairen Paratype TK032 (Zhejiang; Han Nairen 1983) 1983) Paratypes TK033-035 (Zhejiang; Han Nairen 1983)

Hypermecaspis asiatica — photo 2 — Photo 2 · Holotype TK031 (Zhejiang; Han Nairen Paratype TK032 (Zhejiang; Han Nairen 1983) 1983) Paratypes TK033-035 (Zhejiang; Han Nairen 1983)

Hypermecaspis asiatica — photo 3 — Photo 3 · Holotype TK031 (Zhejiang; Han Nairen Paratype TK032 (Zhejiang; Han Nairen 1983) 1983) Paratypes TK033-035 (Zhejiang; Han Nairen 1983)

Classification

Order Ptychopariida / Suborder Olenina / Family Hypermecaspididae

Genus

Hypermecaspis Harrington & Leanza, 1957

Genus author

Harrington H. J. & Leanza A. F.

Genus etymology

hyper-, Greek, excessive, elevated, beyond, above, outside; mec-, Greek, length, height; aspis, Greek, shield

Species

H. asiatica Han, 1983

Species author

Han Nairen

Species etymology

Asia

Age

Tremadocian (Early Ordovician)

Distribution

Zhejiang

Diagnosis

Cephalon semi-elliptical; glabella truncate-conical with 5 pairs of glabellar furrows; occipital ring trilobate with a median occipital node; preglabellar field longitudinally long, covered with longitudinal striations; eye ridges short; palpebral lobes medium-long; librigenae medium-wide with short genal spines. Thorax long, of 19 segments; axis narrower than pleurae; pleural furrows deep, reaching the pleural tips, pleural spines recurved. Pygidium medium-sized, transversely elliptical, surface wrinkled; axis with 5-7 rings, reaching the inner margin of the border, with a postaxial ridge; pleural furrows and pleural ribs distinct; border wide.