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Figure 1.
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Number of North American species-group taxa described over time, by decade. Data excludes adventive species as well as impression and amber fossils.
Figure 2.
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![](https://binary.pensoft.net/fig/178544/singlefigmini/file.jpg)
Cumulative number of North American species-group taxa described over time, by decade. Data excludes adventive species as well as impression and amber fossils. Line with square marker = total available taxa, line with circular marker = currently valid taxa.
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