Traits taxon details
original description
Kobayashi T. (1933). Faunal study of the Wanwanian (basal Ordovician) series with special notes on the Ribeiridae and the Ellesmereoceroids. <em>Journal of the Faculty of Science Imperial University of Tokyo Section II Geology, Mineralogy, Geography, Seismology.</em> 3(7): 249-328. [details]
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