A genus of cyanobacteria whose species contain the a and b forms of chlorophyll (q.v.) found in green plants. Therefore, Prochloron is sometimes called a living fossil (q.v.), a missing link in the evolution of the chloroplast (q.v.). P. didemni, the type species for this genus, lives in close association with marine ascidians. See Cyanobacteria, serial symbiosis theory.
Subjects: Genetics and Genomics.