Serrodiscus Temporal range:
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pygidia of Serrodiscus silesius | |
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Genus: | Serrodiscus Richter & Richter, 1941
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Paradiscus Kobayashi, 1943 [type: Microdiscus speciosus Ford, 1872] |
Serrodiscus Richter and Richter 1941.[1] is a genus of Eodiscinid trilobite belonging to the family Weymouthiidae Kobayashi T. (1943),[2] Order Agnostida (Salter 1864).[3] It lived during the late Lower Cambrian, with remains found in Canada (Newfoundland & Nova Scotia), China (Gansu), The United Kingdom (England), Germany (Silesia), Poland (Holy Cross Mountains), the Russian Federation (Tuva, Gorno-Altayskaya, Kuznetsk Alatau), and the United States (Massachusetts, New York State).[4] It is named for the spines on the ventral side of the pygidium, which give it a serrated impression.
Fletcher & Theokritoff (2008) [5] designated Shaw’s (1950, pl. 79, fig. 24) [6] specimen of “Weymouthia nobilis (Ford, 1872)” [7] as the holotype of a new species, Serrodiscus weymouthioides, and considered Runcinodiscus Rushton (in Bassett et al., 1976) [8] [= ?Weymouthia nobilis (Ford, 1872)] to be a junior synonym of Serrodiscus. Weymouthia and Runcinodiscus had previously been viewed as closely allied with Serrodiscus (e.g. Rushton op. cit., 1976).
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