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Euglenas in polemics

Why are euglenas included in polemics associated to their taxonomic classification?

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Euglenas are included in taxonomic polemics since they tend to be categorized sometimes as protozoans and at times as algae. Though they contain chloroplasts and they are photosynthetic autotrophic beings, euglenas do not encompass a cell wall and they can survive by “eating” substances from atmosphere when light is not accessible for photosynthesis. Curiously euglenas also contain a photosensitive structure termed as stigma which orients the movement of the cell in the direction of light. Nowadays euglenas are categorized as algae; however it is suspected that they are general ancestors of protozoans and algae.

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