A flagellated protoctist belonging to the Euglenida (See Classification). It was in this species that circular molecules of DNA from chloroplasts were first observed. Later when the complete nucleotide sequence of chDNA was determined, genes were identified with introns and twintrons (introns within introns). See Chronology, 1961, Manning et al.; 1972, Pigott and Carr; 1993, Hallick et al.
Subjects: Genetics and Genomics.