Red and green algae
(a) Red algae and (b) green algae (visualized by light microscopy) share similar DNA sequences with photosynthetic cyanobacteria. Scientists speculate that, in a process called endosymbiosis, an ancestral prokaryote engulfed a photosynthetic cyanobacterium that evolved into modern-day chloroplasts.
Source
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"OpenStax College, Eukaryotic Origins. October 16, 2013."
http://cnx.org/content/m44614/latest/Figure_23_01_03ab.jpg
OpenStax CNX
CC BY 3.0.
