A subphylum or major grouping of protist organisms that includes euglenas and similar single-celled creatures with flagella.
From 'euglena' + Latin '-ida' (suffix denoting a group or division). Named to create a higher-level classification for euglenoid organisms in scientific taxonomy.
Euglenida organisms taught scientists that the tree of life is messier than they thought—these creatures don't fit neatly into 'plant' or 'animal,' which is why they forced biologists to completely rethink what those categories even mean.
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