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Algae are unicellular - not joined to neighbouring cells (even with colourless mucilage)
2. Please select type of cell wall/outline.
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Cell outline continually changing due to flexible cell wall (pellicle; euglenoids); may be propelled by flagella
Euglena
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Cell with rigid cell wall, lacking shallow groove at equator, and motile, propelled by one or more waving hair-like structures (flagella)
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Cell wall has the form of a rigid clear box, either semi-rectangular “shoe-box” like, or circular “hat-box” like, with fine ornamentation; may move by gliding; chloroplasts brown
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Shallow groove encircles the cell equator
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Cell outline crescent-shaped (lunate) with green contents
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Cell wall ornamented with spines, but lacking central constriction
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Cell wall is smooth, cell outline round to ellipsoidal, and featureless
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Cell outline has a deep constriction that divides the cell into two approx. equal semicells
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Cell outline long and thin (maybe somewhat curved), with green cell contents
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Cell outline elongated with basal holdfast; usually attached to another object
