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Here is a blog post and a lengthy thread on the 1932 "histomap".
Romerograms are similar, but have a much more explicit phylogenetic
component, and the "relative dominance" is (if at all) labeled "diversity"
even though it is practically never a species, genus or even family count
(almost always the mammal bubble is broader than the bird bubble, the edges
are smooth and rounded instead of pixelized, and so on).