The glaucophytes, also known as glaucocystophytes or glaucocystids, are a small group of freshwater microscopic algae. Together with the red algae (Rhodophyta) and green algae plus land plants (Viridiplantae or Chloroplastida), they form the Archaeplastida. However, the relationships between the red algae, green algae and glaucophytes are unclear, in large part due to limited study of the glaucophytes. [more]
The red algae, or Rhodophyta ( or /?ro?d?'fa?t?/; from Greek: ??d?? (rhodon) = rose + f?t?? (phyton) = plant, thus red plant), are one of the oldest groups of eukaryotic algae, and also one of the largest, with about 5,000?6,000 species of mostly multicellular, marine algae, including many notable seaweeds. Other references indicate as many as 10,000 species; more detailed counts indicate ~4,000 in ~600 genera (3,738 marine spp in 546 genera and 10 orders (plus the unclassifiable); 164 freshwater spp in 30 genera in 8 orders). [more]
At least 14,636 species and subspecies belong to the Phylum Rhodophyta.
More info about the Phylum Rhodophyta may be found here.
^ Deschamps, P.; Moreira, D. (2009). "Signal conflicts in the phylogeny of the primary photosynthetic eukaryotes". Molecular Biology and Evolution26 (12): 2745?2753. doi:10.1093/molbev/msp189. PMID 19706725. edit