Fig. 7

Observed species richness (dots) and simulated latitudinal distribution, the top curve represents all 244 species of polychaetes analysed (the dotted lines represent the limits of 95 % confidence level). Downwards, the computed curves (dashed lines) display results from 123 wide-ranging species (≥6° latitude), from 52 species with intermediate ranges (3,6) and from 69 species with ranges narrow that 3° latitude, respectively