division of algae, red algae
Rhodophyta is a group of algae commonly known as red algae, characterized by their reddish color. These organisms are found primarily in marine environments and are important sources of food, industrial materials, and nutrients in ocean ecosystems.
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red algae
PHYLUM
Orders Acrochaetiales Bangiales Batrachospermales Ceramiales[1] Corallinales Delesseriaceae Cyanidiales Gelidiales Gracilariales Nemaliales 紫球藻目(Porphyridiales) More may exist? 紅藻綱是紅藻門旗下兩個綱之一,包含了大多數的紅藻[1]。 延伸閱讀 Relationships of classes: Saunders and Hommersand, 2004; Harper & Saunders, 2001 參考資料 ^ 1.0 1.1 Lee, R.E., Phycology, 4th edition, Cambridge University Press, 2008, ISBN 978-0521638838 紅藻綱是一個與藻類相關的小作品。你可以通过編輯或修訂擴充其內容。 查 论 编 原始色素体生物 / 泛植物 域 古菌 细菌 真核生物 (界 植物 Hacrobia(英语:Template:Hacrobia) 不等鞭毛类(英语:Template:Heterokont) 囊泡虫 有孔虫(英语:Template:Rhizaria) 古虫 变形虫(英语:Template:Amoebozoa) 动物 真菌) 红藻门 溫泉紅藻綱 Porphyridiophyceae 复丝藻纲(英语:Compsopogonophyceae) Stylonematophyceae Rhodellophyceae 原始紅藻綱(英语:Bangiophyceae) 真红藻纲(英语:Florideae) Hildenbrandiales Acrochaetiales Nemaliales Batrachospermales 珊瑚藻 Gelidiales Gracilariales Ceramiales 皮胆虫(英语:Picozoa)皮胆虫(英语:Picozoa) 灰胞藻 Glaucocystis Cyanophora Gloeochaete 隐藻门Cryptomonadales Campylomonas Chilomonas Chroomonas 隐鞭藻 Falcomonas Geminigera Guillardia 球半隐藻 Plagioselmis Proteomonas Storeatula Rhodomonas Teleaulax Goniomonadales Goniomonas 绿色植物/狭义植物绿藻门 青绿藻纲(英语:Prasinophyceae) UTC类群:石莼纲 共球藻纲 绿藻纲 链型植物轮藻门 轮藻綱 鞘毛藻(英语:Coleochaetales) 鼓藻(英语:Desmidiales) 克里藻
via GBIF
Red algae, or Rhodophyta (/roʊˈdɒfɪtə/, /ˌroʊdəˈfaɪtə/; from Ancient Greek ῥόδον (rhódon) 'rose' and φυτόν (phutón) 'plant'), make up one of the oldest groups of eukaryotic algae. The Rhodophyta comprises one of the largest phyla of algae, containing over 7,000 recognized species within over 900 genera amidst ongoing taxonomic revisions. The majority of species (6,793) are Florideophyceae, and mostly consist of multicellular, marine algae, including many notable seaweeds. Red algae are abundant in marine habitats. Approximately 5% of red algae species occur in freshwater environments, with greater concentrations in warmer areas. Only a few terrestrial (or semi-terrestrial) genera of red algae exist, such as Porphyridium, Cyanidioschyzon, Cyanidium, Chroodactylon, and Goniotrichum. This may be due to an evolutionary bottleneck in which the last common ancestor lost about 25% of its core genes and much of its evolutionary plasticity.
Red algae form a distinct group characterized by eukaryotic cells without flagella and centrioles, chloroplasts without external endoplasmic reticulum or unstacked (stroma) thylakoids, and use phycobiliproteins as accessory pigments, which give them their red color. Despite their name, red algae can vary in color from bright green, soft pink, resembling brown algae, to shades of red and purple, and may be almost black at greater depths. Unlike green algae, red algae store sugars as food reserves outside the chloroplasts as floridean starch, a type of starch that consists of highly branched amylopectin without amylose. Most red algae are multicellular, macroscopic, and reproduce sexually. The life history of red algae is typically an alternation of generations that may have three generations rather than two. Coralline algae, which secrete calcium carbonate and play a major role in building coral reefs, belong there.
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