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Acrosorium Polyneurum
''Acrosorium polyneurum'' is a species of red algae first described by Okamura. It grows in intertidal and shallow subtidal waters in Japan where it is grazed by the sea urchin ''Hemicentrotus pulcherrimus ''Hemicentrotus pulcherrimus'' is a species of sea urchin, the only one in the monotypic genus ''Hemicentrotus''. It was first described by the American engineer and marine zoologist Alexander Agassiz in 1864 as ''Psammechinus pulcherrimus''. It ...''. References Delesseriaceae {{Rhodophyta-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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] |
Kintarô Okamura
was a Japanese botanist and educationalist (1867 - 1935). He is the author of important studies about seaweed Seaweed, or macroalgae, refers to thousands of species of macroscopic, multicellular, marine algae. The term includes some types of '' Rhodophyta'' (red), ''Phaeophyta'' (brown) and ''Chlorophyta'' (green) macroalgae. Seaweed species such as ...s. He's also well known for his educational books collection, the ''Ohraimono''. Bibliography * * * * - published between 1907 and 1937, Japanese text with English summary. Total 10 volumes were bound to seven. Reprint in 2016. ** * * * * * * * References Short biography 1867 births 1935 deaths 20th-century Japanese botanists 19th-century Japanese botanists {{Japan-botanist-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemicentrotus Pulcherrimus
''Hemicentrotus pulcherrimus'' is a species of sea urchin, the only one in the monotypic genus ''Hemicentrotus''. It was first described by the American engineer and marine zoologist Alexander Agassiz in 1864 as ''Psammechinus pulcherrimus''. Its range extends along the coasts of Korea and China, and in Japan from Kyūshū to Ishikari Bay. An edible species, it is harvested from Kyūshū to Fukui, in the Sea of Japan. Description This sea urchin has a thick test and a large number of tiny, fine, sharp spines. The tubercles are small and closely packed, arranged in slightly zig-zag horizontal rows, with four to eight tubercles on each inter-ambulacral plate and three on each ambulacral plate. The pores are arranged in diagonal lines of four, with the rows being separated by small tubercles. The colour of this sea urchin is pale greenish-olive above, and brownish-green below. Distribution ''H. pulcherrimus'' is native to tropical waters in the western Central Pacific Ocean, the w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
