Type species
By monotypy and original designation, ''Runcinodiscus index'' Rushton (''in'' Bassett ''et al.'' 1976). Holotype is A 15360 in the collection of the Sedgwick Museum of Earth Sciences, University of Cambridge.Locality and age
The type specimen (Cobbold, 1931) was collected from the ''Protolenus'' Limestone (Ac5) omley Series 180m south of Comley Quarry, near Church Stretton, Shropshire, England - according to Morris (1988, p.205).Remarks
Fletcher & Theokritoff (2008) designated Shaw’s (1950, pl. 79, fig. 24) specimen of “ ''Weymouthia nobilis'' (Ford, 1872)” as the holotype of a new species, ''Serrodiscus weymouthioides'', and considered ''Runcinodiscus'' Rushton (in Bassett ''et al''., 1976) ?''Weymouthia nobilis'' (Ford, 1872)to be a junior synonym of ''Serrodiscus''; Rushton (1976) had previously regarded ''Weymouthia'' and ''Runcinodiscus'' as closely allied with ''Serrodiscus''. ''Weymouthia nobilis'' (Ford 1872), first described from the Taconic region of New York State, was also recorded by Cobbold (1931) from the ''Protolenus'' Limestone (Ac5) rotolenid-Strenuellid Zoneat Comley, Shropshire, England, but Rushton (in Bassett ''et al.'', 1976, p. 637) showed that the English specimens are specifically distinct from ''W. nobilis'' as described by Ford (1872) and, with some reservation, erected new genus and species, ''Runcinodiscus index''. ''Runcinodiscus'' cf. ''index'' Rushton, described originally by Kiær (1917) as ''Weymouthia nobilis'', was recovered from the Lower Cambrian ''Holmia'' Shale (''Holmia Kjerulfi'' Assemblage-zone) at Tømten, close to Lake Mjøsa, Southeast Norway (Ahlberg, 1983, p. 289, fig. 1).AHLBERG, P. 1983. Redescription of a Lower Cambrian eodiscid trilobites from Norway. ''Norsk Geologisk Tidsskrift'', Vol. 63, pp. 289 - 290. Oslo.References
{{Taxonbar, from=Q7379720 Weymouthiidae Agnostida genera Cambrian trilobites Cambrian trilobites of Europe Cambrian genus extinctions