Ascidiae Drawing (1899) by Ernst Haeckel Poster

A color plate illustrating Ascidiacea from Ernst Haeckel's ''Kunstformen der Natur'' (1899).

Ernst Haeckel was a German zoologist, naturalist, philosopher, physician, professor, marine biologist, and artist who discovered, described and named thousands of new species, mapped a genealogical tree relating all life forms, and coined many terms in biology, including ecology, phylum, phylogeny, and Protista.