Further studies of Cyrtograptus robustus

A complete specimen of Cyrtograptus robustus Fu, 1986 was discovered in Ziyang County of Shaanxi Province. In this paper, the specimen is described, and characteristics of main stipe, cladium and thecal of Cyrtograptus robustus are restudied. The main stipe is wider than other Cyrt. sp., and the number of thecae between successive cladium of Cy. robustus becomes larger from the proximal part to the distal end. There are more first cladiums, but with no second cladium.