Runcinodiscus
Runcinodiscus Rushton is a genus of Lower Cambrian Eodiscinid trilobite belonging to the family Weymouthiidae, Order Agnostida.
Type species
By monotypy and original designation, Runcinodiscus index Rushton. Holotype is A 15360 in the collection of the Sedgwick Museum of Earth Sciences, University of Cambridge.Locality and age
The type specimen was collected from the Protolenus Limestone, 180m south of Comley Quarry, near Church Stretton, Shropshire, England - according to Morris.Remarks
Fletcher & Theokritoff designated Shaw’s specimen of “ Weymouthia nobilis ” as the holotype of a new species, Serrodiscus weymouthioides, and considered Runcinodiscus Rushton to be a junior synonym of Serrodiscus; Rushton had previously regarded Weymouthia and Runcinodiscus as closely allied with Serrodiscus. Weymouthia nobilis, first described from the Taconic region of New York State, was also recorded by Cobbold from the Protolenus Limestone at Comley, Shropshire, England, but Rushton showed that the English specimens are specifically distinct from W. nobilis as described by Ford and, with some reservation, erected new genus and species, Runcinodiscus index.Runcinodiscus cf. index Rushton, described originally by Kiær as Weymouthia nobilis, was recovered from the Lower Cambrian Holmia Shale at Tømten, close to Lake Mjøsa, Southeast Norway.