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Displaying taxonomic coverage using a treemap

A quick, and not altogether satisfactory hack, but I've added a simple interactive treemap to BioStor. It's essentially a remake of the Catalogue of Life treemap I created in 2008, but coloured by the number of references I've extracted from BHL. I wanted a quick way to visualise which groups were well represented (darker colours), and which weren't (lighter colours). For example, in the diagram below we can see that Annelida, Arthropoda, Chordata, Cnidaria, and Mollusca have most of the references.

The treemap at BioStor is interactive. You can click on a panel in the treemap to drill down. To go back up, click on the desired level in the tree displayed to the left of the treemap.