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Their morphological range includes filamentous, branched, feathered, and sheetlike thalli. The red algae have reddish phycobilin pigments— phycoerythrin and phycocyanin. An extinct form of red algae that went extinct was Vanvoorstia bennettiana (Bennett's Seaweed). Chloroplastida…, Rhodophyta (red algae) Green algae – Chlorophyceae. Examples are Chlamydomonas, Spirogyra, and Chara; Phaeophyceae – Also called as brown algae, they are predominantly marine. Division-level classification, as with kingdom-level classification, is tenuous for algae. No plasmodesmata between cells, but distinctive pit plugs exist. However, it is unclear where the red algae or cryptomonads belong, and the overall conclusion is that the algae are not all closely related, and they do not form a single evolutionary lineage devoid of other organisms. Some are freshwater e.g. An alga is the living, eukaryotic, and photosynthetic organism usually grown in moist areas. Cell wall composition. These are Chlorophycophyta, Xanthophycophyta, Bacillariophycophyta, Phaeophycophyta, Rhodophycophyta, Chrysophycophyta, Euglenophycophyta, Cryptophycophyta and Pyrrophycophyta. So, red algae can live at depths that range from 100 meters to 250 meters. Batrachospermun, Polysiphonia, etc. This phylum contains over 7000 recognized species. Habitat – Freshwater, Marine and terrestrial. Their usual red or blue colour is the result of a masking of chlorophyll by phycobilin pigments (phycoerythrin and phycocyanin). Kingdom Plantae includes green, brown and red algae, liverworts, mosses, ferns and seed plants with or without flowers. Algae 7 The red seaweed Porphyra (Figure 1.8) is known by many local names, such as laver or nori, and there are about 100 species.This genus has been cultivated extensively in many Asian countries and is used to wrap the rice and fish that compose the Japanese They are a multicellular, filament, blade structure. Industrially, Irish moss (Chondrus) is used as a gelatin substitute in puddings, toothpaste, ice cream, and preserves. Consists of 2 subgroups, the polyphyletic bangiophyceans and the monophyletic florideophyceans. Some examples of red algae include, C. Merolae, Atractophora hypnoides, Lemanea, Palmaria palmata, and Carrageen. Thallus: Red algae show a variety of life forms- Rhodophyceae or red algae e.g. The scientific name for red algae is rhodophyta. Red algae or Rhodophyta are one of the three types of seaweeds with brilliant red color. A generally agreed classification of algae recognizes nine broad taxonomic groups, called Divisions. In the system of Adl et al. They are red in colour due to the presence of a pigment called chlorophyll A, phycocyanin, and phycoerythrin. Algae are usually green, but they can be found in a variety of different colours. 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They fall under the kingdom Protista and phylum Rhodophyta. Updates? Other pigments are present: chlorophyll a and d, α- and β-carotene, lutein and zeaxanthin. This article was most recently revised and updated by, https://www.britannica.com/science/red-algae, University of California, Berkeley: Museum of Paleontology - Introduction to the Rhodophyta, Monterey Bay Aquarium Research Institute - Rhodophyta - Red Algae. The authors use a hierarchical arrangement where the clade names do not signify rank; the class name Rhodophyceae is used for the red algae. Some red algae are important foods (e.g., laver, dulse). They are also involved in nourishing your skin, boosting the immune system and contributing to bone health. Red algae are protists or microscopic organisms in the phylum Rhodophyta, and range from simple one-celled organisms to complex, multi-celled organisms. Asexual mode of reproduction is by monospores and during the sexual mode of reproduction, they undergo alternation of generations. The algae are collected, washed and dried into thin sheets, then rolled around flavored rice with fish – We call the dish “sushi”! The ability to absorb blue light allows red algae to live at greater depths than either brown or green algae. Red algae, (division Rhodophyta), any of about 6,000 species of predominantly marine algae, often found attached to other shore plants. Among them, 6,793 species are found in the Class Florideophyceae. Hence, they are called the members of aquatic organisms. Corrections? Red algae gain their often brilliant colors thanks to the pigment phycoerythrin. Red algae are different from other groups except for diatoms. Both Florideophyceae and Bangiophyceae comprise 99% of red algal diversity in marine and freshwater habitats. According to the records, there are more than 50,000’s known species of Algae and based on their habitat, presence of biological pigments and other characteristics they are classified into seven different types. For instance, algae living in snow contain carotenoid pigments in addition to chlorophyll, hence giving the surrounding snow a distinctive red hue. Classification of algae proposed by Fritsch is primarily based of the pigmentation of algae. Most diatoms exist on an individual basis, though some are part of to make colonies. Coralline red algae can form an algal ridge that absorbs wave energy and thereby protects the more delicate organisms that inhabit the sheltered lagoons and back-reef habitats. They have the ability to survive at a greater depth than other algae because the pigment Phycoerythrin absorbs the blue light that can penetrate deeper than any other light wave. They are rich in calcium and also used in vitamin supplements. They have eukaryotic cells … CLASSIFICATION OF ALGAE. Type and location of flagella. This allows red algae to carry out photosynthesis at a greater depth. Your email address will not be published. What are Red Algae. Red algae is not classified in the typical genus-species way, which is why it only has a one word scientific name. Stay tuned with BYJU’S to know more about the algae, their types, general characteristics,  important facts about the algae, red algae, and blue-green algae. These diverse group of aquatic organisms is neither plant nor animals. Storage product. Their cell wall is two-layered; the outer layer cont… Ø All major algal groups have at least one characteristic pigment in their cells. The red algae form a distinct group. Molecular classification systems have placed some of the classical algae with plants (green algae); some as a separate lineage (red algae); some with the stramenopiles (golden-brown and yellow-green algae, brown algae, and diatoms); some with the alveolates (dinoflagellates); and still others with some protozoa (euglenoids). Red algae are also used to produce agar that is used as a food additive. Predominantly filamentous; mostly photosynthetic, a few parasitic; photosynthetic species with chlorophyll, Some scientists consider the red algae, which bear little resemblance to any other group of organisms, to be very primitive eukaryotes that evolved from the prokaryotic blue-green algae (cyanobacteria). Omissions? Red algae are members of the phylum Rhodophyta. Listed below are general characteristics of Red Algae. Red marine algae are found in oceans, and generally referred to … Allies are important foods ( e.g., laver, dulse ) are used as a substitute... 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