Biology / Unit 9 Bio 2009 short lesson, about 20 seconds
Stramenopiles: Diatoms and Brown Algae
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The idea
Stramenopiles are defined by a textured, "hairy" flagellum, often paired with a smooth one; diatoms and brown algae are its best-known members.
In practice
A diatom encases itself in a glassy, silica wall, while brown algae like giant kelp form the largest stramenopiles.
Where people slip
The defining hairy flagellum is a structural criterion, not a size limit — this group spans single diatoms to kelp forests.
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