plural noun
Eu·​gle·​na·​les | \-ā(ˌ)lēz\

Definition of Euglenales 

: an order of algae (class Euglenophyceae) comprising forms in which the motile flagellate is the dominant phase in the life cycle — compare colaciales

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History and Etymology for Euglenales

New Latin, from Euglena + -ales

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