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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), 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 that l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pterocladiophilaceae
The Pterocladiophilaceae is a small family of red algae containing 2 (or 3) genera of thallus parasitic algae. Taxonomy The family ''Pterocladiophilaceae'' was originally established by Fan & Papenfuss (1959: 38) to accommodate their newly named genus and species, ''Pterocladiophila hemisphaerica'', a parasite on '' Pterocladia lucida'' in New Zealand. This parastitic alga, which differs from all other parasitic red algae in having zonately divided tetrasporangia, was tentatively assigned to the ''Cryptonemiales''. Fredericq & Hommersand (1990a), as an outgrowth of their detailed morphological study of ''Holmsella pachyderma'' , a parasite algae feeding on ''Gracilaria'' and ''Gracilariopsis'' in Great Britain and Ireland that had been assigned to the ''Choreocolacaceae'' family, noted that it had a lot of similarities among ''Holmsella'' {{small, Sturch, ''Gelidiocolax'' {{small, Gardner, and ''Pterocladiophila''. These various similarities include the pattern of vegetative cel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gracilariaceae
The Gracilariaceae is a small family of red algae containing several genera of agarophytes. It has a world-wide distribution. 24 species are found in China, and 6 species are found in Great Britain and Ireland. It is found in Australia and Chile. They are normally found in intertidal bays, back waters and estuaries. The family have been extensively investigated over the last 30 years, and various studies have yielded comprehensive information on their life history, cultivation, taxonomy, and utilization (Bellorin et al. 2002, Rueness 2005). Studies on the structure of their reproductive organs and the phylogenetic relationships among species inferred from rbcL sequence analyses have produced three clades at the genus level, namely ''Gracilaria'', ''Gracilariopsis'', and ''Hydropuntia'' (Gurgel and Fredericq 2004). In 2012, the University of São Paulo, Brazil set up the Gracilariaceae Germplasm Bank, to use molecule markers for the identification of species. Genera As acce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gracilaria
''Gracilaria'' is a genus of red algae (Rhodophyta) notable for its economic importance as an agarophyte, as well as its use as a food for humans and various species of shellfish. Various species within the genus are cultivated among Asia, South America, Africa and Oceania. Taxonomy ''Gracilaria'' contains the following subtaxa: *'' Gracilaria abbottiana'' M.D.Hoyle *'' Gracilaria abyssalis'' Gurgel & Yoneshigue-Valentin *'' Gracilaria aculeata'' (Hering) Papenfuss *'' Gracilaria aggregata'' Hooker f. & Harvey *'' Gracilaria ambigua'' Greville *'' Gracilaria apiculata'' P.Crouan & H.Crouan ** ''Gracilaria apiculata'' subsp. ''candelabriformis'' Gurgel, Fredericq & J.N.Norris *'' Gracilaria apiculifera'' J.Agardh ** ''Gracilaria arcuata'' f. ''rhizophora'' Børgesen ** ''Gracilaria arcuata'' var. ''attenuata'' Umamaheswara Rao ** ''Gracilaria arcuata'' var. ''snackeyi'' Weber Bosse *'' Gracilaria arcuata'' Zanardini *'' Gracilaria armata'' (C.Agardh) Greville *'' Gracilaria artic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
