Radiolaria

Definitions

  • WordNet 3.6
    • n Radiolaria marine protozoa
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Webster's Revised Unabridged Dictionary
    • n. pl Radiolaria (Zoöl) Order of rhizopods, usually having a siliceous skeleton, or shell, and sometimes radiating spicules. The pseudopodia project from the body like rays. It includes the polycystines. See Polycystina.
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Century Dictionary and Cyclopedia
    • radiolaria A class of filose non-corticate Protozoa: a name applied by Haeckel (in 1862) to the protozoans called by Ehrenberg Polycystina. The radiolarians are marine gymnomyxine protozoans in which no contractile vacuoles are observed, having an amœbiform body of spherical or conical figure with radiant filose pseudopods, inclosing a similarly shaped perforated test of membranous texture called the central capsule. The intracapsular protoplasm is continuous through the perforations with that which is extracapsular, and has a large specialized nucleus or several such nuclei. There is usually a skeleton of silicious spicules or of the substance called acanthin, and embedded in the protoplasm may be oil-globules, pigment-granules, and crystals. Most radiolarians contain peculiar nucleated yellow corpuscles regarded as parasitic algals. Reproduction both by fission and by sporulation has been observed. The Radiolaria have been divided into the subclasses Silicoskelcta and Acanthometridea, according to the chemical composition of the skeleton, the former subclass into Peripylæa, Monopylæa, and Tripylæa (or Phæodaria); into Monocyttaria. with one central capsule, and Polycyttaria, with several such; and in various other ways. The latest monographer arranges them under four subclasses or “legions”:
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Etymology

Webster's Revised Unabridged Dictionary
NL. See Radioli

Usage

In literature:

Now the lowest types of Radiolaria are of this character.
"The Story of Evolution" by Joseph McCabe
An aberrant flagellate bearing a single flagellum and a silicious skeleton resembling those of the Radiolaria.
"Marine Protozoa from Woods Hole" by Gary N. Calkins
Radiolaria are found in cherts in the Culm of Devonshire and Cornwall, in Russia, Germany and elsewhere.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3" by Various
Some marine animalcules, the Radiolaria, have skeletons of silica.
"The Geological Story of the Isle of Wight" by J. Cecil Hughes
What are foraminifera; radiolaria?
"A Guide for the Study of Animals" by Worrallo Whitney
The silica was derived from the tests of radiolaria and the spicular skeletons of sponges.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5" by Various
Haeckel's 'Generelle Morphologie,' 'Radiolaria,' 'Schoepfungs-Geschichte,' and 'Ursprung des Menschen-Geschlechts,' 262, 263.
"Charles Darwin: His Life in an Autobiographical Chapter, and in a Selected Series of His Published Letters" by Charles Darwin
Most of the forms as yet discovered, I have given in the atlas accompanying my Monograph of the Radiolaria.
"The History of Creation, Vol. II (of 2)" by Ernst Haeckel
Ooze, foraminifera, 81; radiolaria, 81.
"Elementary Zoology, Second Edition" by Vernon L. Kellogg
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