A New Genus Pseudokotuia (Trilobita: Anomocaridae) from the Chaumitien Formation (Cambrian Paibian Stage), Central Shandong, North China

Abstract A new trilobite, Pseudokotuia quadrata n. gen. n. sp., is based on new materials collected from shallow water carbonate platform facies in the Chaumitien Formation (Cambrian Paibian Stage) at the Jiulongshan Section, central Shandong, North China. Pseudokotuia quadrata is recognized by its more strongly convex glabella, concave preglabellar field, strongly convex anterior border, and trapezoidal to pentagonal pygidium, with a straight to weakly embayed posterior pygidial margin, and a narrower, strongly convex pygidial border. It adds to an expanding list of taxa assigned to the Anomocaridae and is an important genus which preserved in carbonate deposits. This discovery expands the morphological diversity within the family and enables the revision of previous taxonomic works.