Algae Over the past two decades, molecular phylogenetic data have allowed evaluations of hypotheses on the evolution of green algae based on vegetative morphological and ultrastructural characters.1)

Viridiplantae, aka green plants, are thought to have originated 700-1500 million years ago and may comprise as many as 500,000 species.2)

Viridiplantae are thought to belong to a larger clade called Archaeplastida or Primoplantae, which supposedly belongs to the even larger (and older) clade of Eukaryotes3). And the story goes that some time between 1,200 to 725 million years ago the Viridiplantae clade split into two clades, the Chlorophytes and Streptophytes


Green algae and the origin of land plants; Louise A. Lewis and Richard M. McCourt, Am. J. Bot. October 2004 vol. 91 no. 10 1535-1556, doi: 10.3732/ajb.91.10.1535
From algae to angiosperms–inferring the phylogeny of green plants (Viridiplantae) from 360 plastid genomes; Brad R Ruhfel, Matthew A Gitzendanner, Pamela S Soltis, Douglas E Soltis and J Gordon Burleigh, BMC Evolutionary Biology 201414:23 DOI: 10.1186/1471-2148-14-23
Eukaryota, Organisms with nucleated cells; Patrick Keeling, Brian S. Leander, and Alastair Simpson; Tree of Life