[4] Some other euglenozoa feed through absorption, and many euglenids possess chloroplasts, the only eukaryotes outside Diaphoretickes to do so without performing kleptoplasty,[5][6] and so obtain energy through photosynthesis.

These chloroplasts are surrounded by three membranes and contain chlorophylls A and B, along with other pigments, so are probably derived from a green alga, captured long ago in an endosymbiosis by a basal euglenozoan.

[7] Historically, euglenozoans have been treated as either plants or animals, depending on whether they belong to largely photosynthetic groups or not.

[11] The phylogeny based on the work of Cavalier-Smith (2016):[12] Hemistasiidae Eupelagonemidae Diplonemidae Ichthyobodonidae Rhynchobodo Neobodonidae Parabodonidae Bodonidae Trypanosomatidae Bihospitidae Postgaardidae Calkinsiidae Entosiphonidae Serpenomonadidae Decastavidae Keelungiidae Sphenomonadidae Petalomonadidae Lentomonadidae Ploeotiidae

Rapazidae Eutreptiaceae Euglenamorphaceae Phacaceae Euglenaceae A consensus phylogeny following the review by Kostygov et al. (2021):[8] Ichthyobodonidae Perkinselidae Allobodonidae Neobodonidae Rhynchomonadidae Cryptobiidae Trypanoplasmatidae Bodonidae Trypanosomatidae Diplonemidae Eupelagonemidae Hemistasiidae Petalomonadida Alistosa Olkasia Anisonemidae Aphagea Rapazidae Eutreptiaceae/Eutreptiidae Euglenaceae/Euglenidae Phacaceae/Phacidae Peranemida Bihospites Calkinsia Postgaardi The following classification of Euglenozoa is as described by Cavalier-Smith in 2016,[12] modified to include the new subphylum Plicomonada according to Cavalier-Smith et al (2017).