Redescription of the Lower Cambrian Lapworthella cornu

Abstract Stenotheca cornu Wiman, 1903, from the Lower Cambrian of the South Bothnian area (southernmost Gulf of Bothnia), is redescribed and referred to the genus Lapworthella Cobbold, 1921. It is a small, cornute, phosphatic fossil with pronounced growth ridges crested with denticles, about 10–20 per mm. It differs from the Siberian L. dentata Missarzhevskij, 1969, in having less densely spaced denticles. The specimens described as L. dentata from the Strenuella Limestone at Comley, England, should be referred to L. cornu.