Thanks Chris Wood for revision of the manuscript. This work is in part supported by the National Key Basic Research Program, the Ministry of Science and Technology of China (MOST 973 Program, 2006CB701400),? and is a contribution to IGCP 463/555.
Izabela Ploch.2007. Intraspecific Variability and Problematic Dimorphism in the Early Cretaceous (Valanginian) Ammonite Saynoceras verrucosum (d’Orbigny, 1841)[J]. ACTA GEOLOGICA SINICA(English edition),81(6):877~882
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