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Red Algae
Red algae, or Rhodophyta (, ; ), 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. The majority of species (6,793) are found in the Florideophyceae (Class (biology), class), and mostly consist of multicellular, ocean, marine algae, including many notable seaweed, seaweeds. Red algae are abundant in marine habitats but relatively rare in freshwaters. Approximately 5% of red algae species occur in freshwater environments, with greater concentrations found in warmer areas. Except for two coastal cave dwelling species in the asexual class Cyanidiophyceae, there are no terrestrial species, which 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. The red algae form a distinct group characterized by having eukaryotic cells without flagella and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodophyta
Red algae, or Rhodophyta (, ; ), 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. The majority of species (6,793) are found in the Florideophyceae ( class), and mostly consist of multicellular, marine algae, including many notable seaweeds. Red algae are abundant in marine habitats but relatively rare in freshwaters. Approximately 5% of red algae species occur in freshwater environments, with greater concentrations found in warmer areas. Except for two coastal cave dwelling species in the asexual class Cyanidiophyceae, there are no terrestrial species, which 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. The red algae form a distinct group characterized by having eukaryotic cells without flagella and centrioles, chloroplasts th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stylonematales
Stylonemataceae is a family of red algae in the class Stylonematophyceae. It is the only family in the monotypic order Stylonematales. Genera and number of species # '' Bangiopsis'' F.Schmitz 3 # '' Chroodactylon'' Hansgirg 3 # '' Chroothece'' Hansgirg 9 # '' Colacodictyon'' Feldmann 1 # '' Empselium'' G.I.Hansen & Scagel 1 # '' Goniotrichiopsis'' G.M.Smith 2 # '' Kyliniella'' Skuja 1 # '' Neevea'' Batters 1 # '' Purpureofilum'' J.A.West, Zuccarello & J.L.Scott 1 # '' Rhodaphanes'' J.A.West, G.C.Zuccarello, J.L Scott & K.A.West 1 # '' Rhodosorus'' Geitler 2 # '' Rhodospora'' Geitler 1 # ''Stylonema'' Reinsch 19 # '' Tsunamia'' J.A.West, G.I.Hansen, Zuccarello & T.Hanyuda 1 # ''Viator'' G.I.Hansen, J.A.West, & G.C.Zuccarello 1 ''Zachariasia'' Lemmermann, 1895 (with holotype ''Zachariasia endophytica'' Lemmermann) is currently regarded as a synonym of ''Chroothece''. This should not be confused with ''Zachariasia'' Voigt 1901 non Lemmermann 1895, which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stylonema Alsidii
''Stylonema alsidii'' is a species of marine red algae. The type locality is Trieste in Italy, but it has a worldwide distribution. The species was first described by Giovanni Zanardini in 1840 as ''Bangia alsidii''. Distribution It is one of the algae of the Houtman Abrolhos, found off the coast of Western Australia. It is one of the red seaweeds of South Africa, including the seaweeds of the Cape Peninsula and False Bay. Ecology It is susceptible to infection by the parasitic oomycete ''Pythium porphyrae ''Pythium porphyrae'', is a parasitic species of oomycete in the family Pythiaceae. It is the cause of red rot disease or red wasting disease, also called ' () in Japanese. The specific epithet ''porphyrae'' () stems from the genus of one of i ...''. References External links * * ''Stylonema alsidii'' at AlgaeBase Stylonematophyceae Species described in 1840 {{red alga-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eukaryota
Eukaryotes () are organisms whose cells have a nucleus. All animals, plants, fungi, and many unicellular organisms, are Eukaryotes. They belong to the group of organisms Eukaryota or Eukarya, which is one of the three domains of life. Bacteria and Archaea (both prokaryotes) make up the other two domains. The eukaryotes are usually now regarded as having emerged in the Archaea or as a sister of the Asgard archaea. This implies that there are only two domains of life, Bacteria and Archaea, with eukaryotes incorporated among archaea. Eukaryotes represent a small minority of the number of organisms, but, due to their generally much larger size, their collective global biomass is estimated to be about equal to that of prokaryotes. Eukaryotes emerged approximately 2.3–1.8 billion years ago, during the Proterozoic eon, likely as Flagellated cell, flagellated phagotrophs. Their name comes from the Greek language, Greek wikt:εὖ, εὖ (''eu'', "well" or "good") and wikt:� ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archaeplastida
The Archaeplastida (or kingdom Plantae '' sensu lato'' "in a broad sense"; pronounced /ɑːrkɪ'plastɪdə/) are a major group of eukaryotes, comprising the photoautotrophic red algae (Rhodophyta), green algae, land plants, and the minor group glaucophytes. It also includes the non-photosynthetic lineage Rhodelphidia, a predatorial (eukaryotrophic) flagellate that is sister to the Rhodophyta, and probably the microscopic picozoans. The Archaeplastida have chloroplasts that are surrounded by two membranes, suggesting that they were acquired directly through a single endosymbiosis event by feeding on a cyanobacterium. All other groups which have chloroplasts, besides the amoeboid genus '' Paulinella'', have chloroplasts surrounded by three or four membranes, suggesting they were acquired secondarily from red or green algae. Unlike red and green algae, glaucophytes have never been involved in secondary endosymbiosis events. The cells of the Archaeplastida typically lack centri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
