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Genus of jawless fishes
Periodon conodonts which existed in what is now Canada , Iran , Argentina , China , Russia , and the United States during the Ordovician Period. It was described by Hadding in 1913, and the type species is P. aculeatus .
Species Periodon flabellum Lindström, 1954 Periodon zgierzensis Dzik, 1976 Periodon aculeatus Hadding, 1913 [1] Periodon selenopsis Serpagli, 1974 [2] Periodon macrodentatus (Graves & Ellison 1941) Periodon hankensis Svend Stouge, 2012 [3] References
^ Dubinina, S. V., and A. V. Ryazantsev (2008), Conodont stratigraphy and correlation of the Ordovician volcanogenic and volcanogenic sedimentary sequences in the South Urals, Russ. J. Earth Sci., 10, ES5001, doi:10.2205/2008ES000302.
^ The Base of the Middle Ordovician Series Using Graphic Correlation Method
Svend Stouge, Wang Xiofeng, Li Zhihong, Chen Xiaohong, and Wang Chuanshang..
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