Radiolaria: achievements and unresolved issues: taxonomy and cytology
スポンサーリンク
概要
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The essentials of the taxonomy and cytology of Radiolaria at the order level are summarized from approximately 110 papers. Living Radiolaria comprise representatives of the following orders: Acantharia, Collodaria, Spumellaria, cyrtid Nassellaria, spyrid Nassellaria and Taxopodia (=Sticholonche). This analysis is based on the most recent molecular biological and fossil data. Phaeodaria, which used to belong to the Radiolaria, belong to the Cercozoa now. Heliozoa are closer to the Cercozoa than to the Alveolata or Radiolaria. A molecular phylogenetic analysis indicates that Polycystina (including Collodaria, Spumellaria and Nassellaria) should not be treated as a monophyletic group.“Polycystine” Radiolaria are characterized by the presence of axopodia, a capsular wall, and a fusule. The endoplasm consists of the Golgi bodies, mitochondria, and other organelles, whereas the ectoplasm is an alveolated reticulum with food, digestive, and perialgal vacuoles, suggesting zonal specialization. The Acantharia are characterized by the presence of a periplasmic cortex with myoneme, acting as a motile contractile plasmalemma, rather than a capsular wall. Taxopodia have thick axopodia and a thick nuclear wall instead of a capsular wall. Characteristic protoplasmic structures such as an intracapsular axopodial system and nucleus are found in “polycystine” Radiolaria, but these structures do not seem to reflect phylogenetic relationships.
著者
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Suzuki Noritoshi
Institute Of Geology And Paleontology Graduate School Of Science Tohoku University
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Aita Yoshiaki
Department Of Geology Faculty Of Agriculture Utsunomiya University
関連論文
- Regular axopodial activity of Diplosphaera hexagonalis Haeckel (spheroidal spumellarian, Radiolaria)
- First application of PDMPO to examine silicification in polycystine Radiolaria
- Mesozoic radiolarians and radiolarian-bearing sequences in the circum-Pacific regions : A report of the symposium 'Radiolarians and Orogenic Belts'
- Basaltic sheet intruding into Middle-Late Permian pelagic sedimentary rocks at Arrow Rocks, Waipapa Terrane, North Island, New Zealand
- Radiolaria: achievements and unresolved issues: taxonomy and cytology
- Tectonic significance of Late Cretaceous Radiolaria from the obducted Matakaoa volcanics,East Cape,North Island,New Zealand (鮫島輝彦先生追悼論文集)
- Radiolaria : achievements and unresolved issues : taxonomy and cytology