Phacopida

Hinggania quadrata

Order Phacopida / Suborder Cheirurina / Superfamily Cheiruroidea / Family Cheiruridae

Dapingian to Darriwilian (Middle Ordovician)Heilongjiang

Hinggania quadrata — photo 1 — Photo 1 · Holotype RCPJ81158 and its sketch (Heilongjiang; Zhao Da et al. 1997) Cranidium, thoracic segment and pygidium specimens Restoration (Zhao Da et al. (Heilongjiang; Zhao Da et al. 1997) 1997)

Hinggania quadrata — photo 2 — Photo 2 · Holotype RCPJ81158 and its sketch (Heilongjiang; Zhao Da et al. 1997) Cranidium, thoracic segment and pygidium specimens Restoration (Zhao Da et al. (Heilongjiang; Zhao Da et al. 1997) 1997)

Hinggania quadrata — photo 3 — Photo 3 · Holotype RCPJ81158 and its sketch (Heilongjiang; Zhao Da et al. 1997) Cranidium, thoracic segment and pygidium specimens Restoration (Zhao Da et al. (Heilongjiang; Zhao Da et al. 1997) 1997)

Hinggania quadrata — photo 4 — Photo 4 · Holotype RCPJ81158 and its sketch (Heilongjiang; Zhao Da et al. 1997) Cranidium, thoracic segment and pygidium specimens Restoration (Zhao Da et al. (Heilongjiang; Zhao Da et al. 1997) 1997)

Classification

Order Phacopida / Suborder Cheirurina / Superfamily Cheiruroidea / Family Cheiruridae

Genus

Hinggania Zhao in Zhao et al., 1997

Genus author

Zhao Da

Genus etymology

Hinggan, pinyin, the Hinggan (Xing'an) region of Heilongjiang Province

Species

H. quadrata Zhao in Zhao et al., 1997

Species author

Zhao Da

Species etymology

quadrata, Latin, square, referring to the rectangular outline of the pygidium

Age

Dapingian to Darriwilian (Middle Ordovician)

Distribution

Heilongjiang

Diagnosis

Dorsal shield ornamented with nodes of varying size. Glabella elliptical-spherical with three pairs of glabellar lateral furrows, the anterior two pairs extremely short; occipital ring longitudinally short, slightly widening at the ends; fixigenae small, longitudinally very short and trans- versely wide, subtriangular, a pair of long tapering genal spines extending backward-laterally from the genal angles; palpebral lobes small, semicircular; proparian facial sutures. Thorax of 9 or more segments (9 preserved); axis convex with wide deep axial furrows and roughly parallel sides; pleurae horizontal, each independent and unconnected but closely packed, surface with nodes and spines, ends pointed and curved backward-laterally. Pygidium rectangular, wider than long; axis short and wide, of one ring, sides parallel; first pair of pleural furrows extending obliquely backward-laterally from both sides of the pygidial axial end, second pair degenerated into a pair of pygidial pits; pleural spines rather long and pointed, the anterior pair extending horizontally outward, subequal to the posterior pair, which extend backward.