Distribution
* The holotype of ''C. acifer'' Rushton (1966, p. 19, pl. 2, figs. 26 a - e), is A 57104, held at the Sedgwick Museum of Earth Sciences, University of Cambridge and was collected by Rushton from about 450' above base of the Purley Shale Formation (''Protolenus'' Biozone) at Camp Hill, St. Paul's Church, Stockingford, Nuneaton, Warwickshire, England losest ICS interval: Cambrian Series 3 – Terreneuvian Epoch ''C. acifer'' is also recorded from a Limestone at the top of the Torneträsk Formation, probably ''Ornamentaspis''? ''linnarssoni'' Assemblage Zone, in the Luobakti section, south of Lake Torneträsk, northern Swedish Lapland AXHEIMER, N., AHLBERG P. & CEDERSTRÖM P., 2007. A new lower Cambrian eodiscoid trilobite fauna from Swedish Lapland and its implications for intercontinental correlation. ''Geol. Mag.'' 144 (6), 2007, pp. 953 – 961. Cambridge University Press, and the lower to middle Brigus Formation (''Hupeolenus'' Zone; ''Tannudiscus balanus'' Subzone) at Cape St Mary's, Newfoundland (Fletcher, 2003). * ''C. chathamensis'' Rasetti (1967, p. 46, pl. 3, figs. 11 - 17) was recovered from the Malden Bridge road cut, on Columbia County Route 32, about one mile W. of Malden Bridge, New York State. In the eastern part of the cut, a few medium-grey, granular, 1-3 inch thick limestone beds yielded a rather large Lower Cambrian faunule very similar to the ''Acimetopus bilobatus'' faunule from limestone exposures on the Griswold farm, about 1 mile southeast of North Chatham, Columbia County, New York State, USA. The strata holding this faunule are referred to as the ''Leptochilodiscus punctulatus'' beds.References
Cambrian trilobites Weymouthiidae Agnostida genera Fossil taxa described in 1966 Trilobites of North America Trilobites of Europe Cambrian genus extinctions {{agnostida-stub