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Rhodophyta

Red algae
Temporal range: Mesoproterozoic–present
Laurencia.jpg
Scientific classification
Domain: Eukaryota
(unranked): Diaphoretickes
(unranked): Archaeplastida
Division: Rhodophyta
Wettstein, 1922

Classification is currently disputed. See Taxonomy.

Algal group δ13C range
HCO3-using red algae −22.5‰ to −9.6‰
CO2-using red algae −34.5‰ to −29.9‰
Brown algae −20.8‰ to −10.5‰
Green algae −20.3‰ to −8.8‰

Classification is currently disputed. See Taxonomy.

The red algae, or Rhodophyta (/rˈdɒftə/ roh-DOF-fit-tə or /ˌrdəˈftə/ ROH-də-FY-tə; from Ancient Greek: ῥόδον rhodon, "rose" and φυτόν phyton, "plant"), are one of the oldest groups of eukaryotic algae. The Rhodophyta also contains one of the largest phyla of algae, containing over 7,000 currently recognized species with taxonomic revisions ongoing. The majority of species (6,793) are found in the Florideophyceae (class), and consist of mostly multicellular, marine algae, including many notable seaweeds. Approximately 5% of the red algae occur in freshwater environments.


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