Revisión sistemática del trilobite oryctocefálido Protoryctocephalus arcticus Geyer & Peel, 2011 del Cámbrico inferior (Piso 4) de Balang, China meridional

The oryctocephalid trilobites from the traditional ‘lower-middle Cambrian’ represent key tools for international correlation. The trilobite zones in South China around the Cambrian Series 2-Miaolingian are made using oryctocephalids. One of the trilobite zones suggested is based on Protoryctocephalus arcticus. Protoryctocephalus from the Balang area in South China was described as Protoryctocephalus wuxunensis , also from the Cambrian Series 2 of South China. However, Protoryctocephalus from Balang shows different morphological features such as different glabellar shape, presence of a transglabellar S1 and more segments in the trunk. These features match with Protoryctocephalus arcticus from the Cambrian Series 2 of Greenland.