Ernst Heinrich Philipp August Haeckel ( 16 February 1834 â '' 9 August 1919 ) , also written von Haeckel , was an important German biologist , naturalist , anatomist , physician , professor , philosopher and artist . Ernst Haeckel discovered , described and named thousands of new species . Ernst Heinrich Philipp August Haeckel ( February 16 , 1834 â `` August 9 , 1919 ) , also written von Haeckel , was an eminent German biologist , naturalist , philosopher , physician , professor 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 anthropogeny , ecology , phylum , phylogeny , and the kingdom Protista .