红藻纲是红藻门旗下两个纲之一，包含了大多数的红藻。

• Relationships of classes: Saunders and Hommersand, 2004; Harper & Saunders, 2001

Bangiophyceae was a class of red algae; it has since been merged with the Floridophyceae to form the Rhodophyceae. The Bangiophyceae, as defined traditionally, are paraphyletic. Their taxonomic identification has been difficult because of a lack of distinct morphological features, and the presumed morphological plasticity of the species. Molecular tools are required to elucidate the relationships within this assemblage.