This week we have a phylogenetic tree literally drawn by the organisms whose relationships are represented. This depicts the evolutionary relationships between the five classes of echinoderms: Asteroidea (sea stars), Ophiuroidia (brittle stars), Echinoidea (sea urchins and sand dollars), Holothuroidea (sea cucumbers), and Crinoidea (sea lillies and feathers).
The picture is by Daniel Brown, who has many more illustrations on his blog, most of them available for sale as posters.
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