Asaphida

Tungtzuella szechuanensis

Order Asaphida / Superfamily Cyclopygoidea / Family Taihungshaniidae

Tremadocian (Early Ordovician)Sichuan, Hubei

Tungtzuella szechuanensis — photo 1 — Photo 1 · Syntype (Sichuan; Sheng Xinfu 1958) Complete dorsal exoskeleton (Hubei; Lu Yanhao et al. 1974)

Tungtzuella szechuanensis — photo 2 — Photo 2 · Syntype (Sichuan; Sheng Xinfu 1958) Complete dorsal exoskeleton (Hubei; Lu Yanhao et al. 1974)

Classification

Order Asaphida / Superfamily Cyclopygoidea / Family Taihungshaniidae

Genus

Tungtzuella Sheng in Lu, 1957

Genus author

Sheng Xinfu

Genus etymology

Tungtzu, Tongzi, Guizhou; -ella, a diminutive suffix

Species

T. szechuanensis Sheng, 1958

Species author

Sheng Xinfu

Species etymology

Szechuan, Sichuan Province

Age

Tremadocian (Early Ordovician)

Distribution

Sichuan, Hubei

Diagnosis

Cranidium smooth with pointed front; glabella with a median node medially, without glabellar or occipital furrows; eyes small, close to the glabella; librigenae wide with long genal spines. Thorax of 8 segments; axis subequal in width to pleurae; pleural furrows shallow, pleural spines short. Pygidium inverted-trapezoidal with a border, lateral angles with a pair of long pygidial spines; axis long, reaching almost to the posterior margin, axial and pleural segmentation not very distinct.