Fig. 3 in Ordovician polychaeturid polychaetes: Taxonomy, distribution and palaeoecology

Fig. 3. Stratigraphical distribution of polychaeturids in the Baltic region and also showing the tentative phylogenetic relationship between the different species. The stratigraphical chart is slightly modified from Nõlvak et al. (2006). Abbreviations: Dap., Dapingian; Flo., Floian; H., Hirnantian; Hun. & Bill., Hunneberg and Billingen; Reg., regional; Trem., Tremadocian.