60 SAMUEL T.TURVEYFig. 3. (a) Strict consensus cladogram for the Reedocalymeninae. Numbers in small type below nodes
represent bootstrap percentages, for all nodes with relative frequencies equal to or greater than 5%.
Stratigraphic ranges are displayed for each taxon; these represent combined ranges for all representatives of
the genus for non-Neseuretus reedocalymenine genera. Ranges may represent overestimates of true
Stratigraphic range, due to poor Stratigraphic information available for some taxa. Stratigraphic ranges of
British taxa have been correlated to the revised British Ordovician stratigraphy of Fortey et al. (2000).