Peronopsis rotundatus

Order Agnostida / Suborder Agnostina / Superfamily Agnostoidea / Family Peronopsidae

Peronopsis, resembling a brooch or a boot.

rotundatus, rounded.

Onymagnostus rotundatus; Quadragnostus rotundatus

Cephalon and pygidium almost round, generally smooth, without distinct ornament. Cephalic border narrow; border furrow relatively shallow; preglabellar field relatively broad; preglabellar median furrow weak; glabellar frontal lobe semicircular-oval, anterior end rounded rounded; middle of posterior lobe slightly expanded backward, with small glabellar node in the mid-posterior part, posterior end broadly rounded; basal lobe small. Thorax of two segments; axis narrowing backward. Pygidial axis relatively narrow and long, slightly narrow, tapering backward with a relatively rounded angle at the rear, terminal end not reaching the border furrow, overall inverted-triangular; a long oval axial node at the constriction of the pygidial axis; postaxial median furrow in smaller individuals relatively distinct on the body, disappearing in larger individuals; pygidial border broad and flat; border furrow broad and shallow; with a pair of short lateral spines.

This species was first discovered in China by the Shandong fossil hunter Zimujun; typical body length about 0.2-1 cm.