Chytridiomycota
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Chytridiomycota, the chytrids, are the simplest true fungi, mostly aquatic, and the only fungal phylum to retain flagellated gametes and zoospores.
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The chytrid Batrachochytrium dendrobatidis parasitizes amphibian skin, a factor contributing to declines in frog populations worldwide.
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Retained flagella mark chytrids as structurally primitive among fungi— every other fungal phylum has lost flagella.