Morphologic Differentiation and Taxonomy of Anisograptus from the Lower OrdovicianLI Ming, FENG Hongzhen and LIU Bo(Department of Earth Sciences, Nanjing University, Nanjing, Jiangsu 210093; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing, Jiangsu 210008)Specimens from the Hule area of Ningguo County, Anhui Province and data of all 25 known species and subspecies shows that Anisograptus has apparent morphologic differentiation in the length of primary stripes, the…