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Violin plot of species number per genera for non-dispersive (dark grey) and dispersive (light grey) lineages for spiders (a) and beetles (b). Plot width represents the relative number of genera with a given species richness. ***p < 0.001, **p < 0.01, *p < 0.05, n.s. = not significant. For aesthetic purposes, an outlier wingless beetle genus (Laparocerus) with 173 species was omitted.
