Late Cambrian euconodonts from Sweden

Th e apparent derivation of several eucodont lineages from different paraconodonts suggests that crown tissue was incipient in paraconodonts although not as a mineralized tissue prone to fossilization. The earliest species of Proconodontus, P. transitans sp. n.. is recognized. It represents a transitional form from paraconodonts to euconodonts from which most later euconodonts stem. The earlier proposed origination of Cordylodus andresi from Proconodontus serratus is confirmed. A conodot-based correlation of the uppermost Cambrian of Sweden  with North America and Estonia is proposed. Earlier reports of the Proconodontus Zone in Estonia are questioned. The uppermost Cambrian conodont zone, Cordylodus proavus, is not known in Sweden.