Biogeographic and Biostratigraphic Implications of the Serratognathus bilobatus Fauna (Conodonta) from the Emanuel Formation (Early Ordovician) of the Canning Basin, Western Australia Author Zhen, Yong Yi Author Nicoll, Robert S. text Records of the Australian Museum 2009 2009-05-27 61 1 1 30 http://dx.doi.org/10.3853/j.0067-1975.61.2009.1520 journal article 10.3853/j.0067-1975.61.2009.1520 2201-4349 5240206 Drepanodus Pander, 1856 Type species . Drepanodus arcuatus Pander, 1856 .