Radiolaria and phaeodaria

Polycystina (~400-800 living species and several thousand extinct forms) and Phaeodaria (~400-500 living species) are exclusively marine, open-ocean plank- tonic protists, most of which possess elaborate siliceous skeletons. The cytoplasm is divided into an internal part (endoplasm) separated from t...

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Detalles Bibliográficos
Publicado: 2017
Materias:
Phaeodaria
Polycystina
Radiolaria
Radiolarians
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97833192_v_n_p731_Boltovskoy
http://hdl.handle.net/20.500.12110/paper_97833192_v_n_p731_Boltovskoy
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_97833192_v_n_p731_Boltovskoy
record_format dspace
spelling paper:paper_97833192_v_n_p731_Boltovskoy2023-06-08T16:38:49Z Radiolaria and phaeodaria Phaeodaria Polycystina Radiolaria Radiolarians Polycystina (~400-800 living species and several thousand extinct forms) and Phaeodaria (~400-500 living species) are exclusively marine, open-ocean plank- tonic protists, most of which possess elaborate siliceous skeletons. The cytoplasm is divided into an internal part (endoplasm) separated from the external, more vacuolated one (ectoplasm) by a perforated membrane - the central capsule. The Polycystina protrude long and slender cytoplasmic projections (axopodia) supported internally by a rigid central rod (axoneme); while the Phaeodria have a network of peripheral finely interconnected pseudopodia. A few Polycystina are colonial, but most, as well as all Phaeodaria, are solitary, around 40 pm to almost 2 mm in size. Most polycystine species peak in abundance between 0 and 100 m, whereas phaeodarians tend to live deeper, often below 300 m. Polycystines have a rich fossil record dating from the Cambrian and are important for stratigraphic, paleoecologic, and evolutionary studies. The world-wide biogeography and diversity of radiolarians is chiefly governed by water temperature. Radiolarian prey includes bacteria, algae, protozoa, and microinvertebrates. Many surface- dwelling species of Polycystina possess symbiotic algae and photosynthetic cyanobacteria that provide nourishment to the host. Some colonial radiolaria reproduce by binary fission of the central capsules. Sexual reproduction of polycystines or Phaeodaria has not been confirmed, but the release of motile swarmers, likely gametes, has been widely documented. In species with a radial symmetry (Spumellaria) shell-growth is centrifugal, whereas in the Nassellaria the internal cephalic elements and the cephalis appear first. Individual longevity is estimated to range between 2 and 3 weeks and 1-2 months. © Springer International Publishing AG 2017. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97833192_v_n_p731_Boltovskoy http://hdl.handle.net/20.500.12110/paper_97833192_v_n_p731_Boltovskoy
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Phaeodaria
Polycystina
Radiolaria
Radiolarians
spellingShingle Phaeodaria
Polycystina
Radiolaria
Radiolarians
Radiolaria and phaeodaria
topic_facet Phaeodaria
Polycystina
Radiolaria
Radiolarians
description Polycystina (~400-800 living species and several thousand extinct forms) and Phaeodaria (~400-500 living species) are exclusively marine, open-ocean plank- tonic protists, most of which possess elaborate siliceous skeletons. The cytoplasm is divided into an internal part (endoplasm) separated from the external, more vacuolated one (ectoplasm) by a perforated membrane - the central capsule. The Polycystina protrude long and slender cytoplasmic projections (axopodia) supported internally by a rigid central rod (axoneme); while the Phaeodria have a network of peripheral finely interconnected pseudopodia. A few Polycystina are colonial, but most, as well as all Phaeodaria, are solitary, around 40 pm to almost 2 mm in size. Most polycystine species peak in abundance between 0 and 100 m, whereas phaeodarians tend to live deeper, often below 300 m. Polycystines have a rich fossil record dating from the Cambrian and are important for stratigraphic, paleoecologic, and evolutionary studies. The world-wide biogeography and diversity of radiolarians is chiefly governed by water temperature. Radiolarian prey includes bacteria, algae, protozoa, and microinvertebrates. Many surface- dwelling species of Polycystina possess symbiotic algae and photosynthetic cyanobacteria that provide nourishment to the host. Some colonial radiolaria reproduce by binary fission of the central capsules. Sexual reproduction of polycystines or Phaeodaria has not been confirmed, but the release of motile swarmers, likely gametes, has been widely documented. In species with a radial symmetry (Spumellaria) shell-growth is centrifugal, whereas in the Nassellaria the internal cephalic elements and the cephalis appear first. Individual longevity is estimated to range between 2 and 3 weeks and 1-2 months. © Springer International Publishing AG 2017.
title Radiolaria and phaeodaria
title_short Radiolaria and phaeodaria
title_full Radiolaria and phaeodaria
title_fullStr Radiolaria and phaeodaria
title_full_unstemmed Radiolaria and phaeodaria
title_sort radiolaria and phaeodaria
publishDate 2017
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97833192_v_n_p731_Boltovskoy
http://hdl.handle.net/20.500.12110/paper_97833192_v_n_p731_Boltovskoy
_version_ 1769175799661854720

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