Red algae

Red algae, or Rhodophyta (rodo meaning red, and phyta meaning plant), are one of the oldest groups of eukaryotic algae. The Rhodophyta also comprises one of the largest phyla of algae, containing over 7,000 currently recognized species with taxonomic revisions ongoing.

Classification

The classification of red algae is based primarily on the morphology of the cystocarp, the structure of the pit connections, and the arrangement of the thallus.

Characteristics

Red algae are defined by having chlorophyll a and chlorophyll d, which are the pigments that give them their red color. They also contain phycobiliproteins, which are protein-pigment complexes that are involved in photosynthesis.

Distribution and habitat

Red algae are found worldwide, from polar to tropical waters. They are commonly found in the intertidal zone and below the low tide mark.

Uses

Red algae have been used for various purposes throughout history. They are a source of food, especially in Asia, where they are used in the preparation of sushi. They are also used in the production of agar and carrageenan, which are used in the food industry as thickeners and stabilizers.

See also

• Algae
• Seaweed
• Carrageenan
• Agar

References

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