A septimembrate apparatus model for the Ordovician conodont genus Cornuodus Fåhraeus, 1966

An investigation o( the Ordovician conodont genus Cornuodus, based on the literature and a collection of almost 8,000 elements from Swedish sections, has led to the conclusion that its apparatus is septimembrate with Pa, Pb, Sa, Sb, Se, Sdl and Sd2 elements. All previously described Cornuodus forms are referred to a single species, C. longibasis, but diffirent ecomorphotypes can be distinguished. The species has an extensive stratigraphical range, from the Tremadoc into the Ashgill. Its environmental preferences are discussed and the element types are described in detail.