| Euglenales | |
|---|---|
_(cropped).jpg) | |
| Euglena mutabilis | |
Scientific classification | |
| Domain: | Eukaryota |
| Clade: | Discoba |
| Phylum: | Euglenozoa |
| Class: | Euglenida |
| Clade: | Euglenophyceae |
| Order: | Euglenales F.Stein, 1878 |
| Families[1] | |
Euglenales (also known asEuglenida) is an order offlagellates in the phylumEuglenozoa. The family includes the most well-known euglenoid genus,Euglena, as well as other common genera likePhacus andLepocinclis.[1]
The order Euglenales is also known by the name Euglenida. The origin of this dual naming system is because of the history of protists. Euglenids have been treated as bothalgae andprotozoans, which are governed by separatenomenclature codes.[2] If classified as an alga, it would fall under theInternational Code of Botanical Nomenclature (ICBN) and its correct name would be Euglenales; if classified as a protozoan, it would fall under theInternational Code of Zoological Nomenclature (ICZN) and would be called Euglenida.[1] Euglenids such as these are considered to beambiregnal protists due to their parallel naming systems.[2]
Euglenales consists mostly of freshwater organisms, in contrast to its sisterEutreptiales which is generally marine. Cells have two flagella, but only one is emergent; the other is very short and does not emerge from the cell, so cells appear to have only one flagellum.[3] In comparison, Eutreptiales is characterized by two emergent flagella.[4]
In its currentcircumscription, Euglenales ismonophyletic, consisting of two sister clades corresponding toEuglenaceae andPhacaceae.[5]
Acladogram representing the phylogenetic relationships is shown below:[1]
| Photosynthetic euglenoids |
| ||||||||||||
| National | |
|---|---|
| Other | |
