Pl-49 Actiniae - Sea Anemone

Plate from Kunstformen der Natur (known in English as Art Forms in Nature)

Ernst Heinrich Philipp August Haeckel 16 February 1834 – 9 August 1919) 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.  Haeckel promoted and popularised Charles Darwin's work in Germany and developed the influential but no longer widely held recapitulation theory ("ontogeny recapitulates phylogeny") claiming that an individual organism's biological development, or ontogeny, parallels and summarises its species' evolutionary development, or phylogeny.