from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Plural form of radiolarian.
from the GNU version of the Collaborative International Dictionary of English
- n.pl. 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.
from The Century Dictionary and Cyclopedia
- A class of filose non-corticate Protozoa: a name applied by Haeckel (in 1862) to the protozoans called by Ehrenberg Polycystina.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. marine protozoa
Sorry, no etymologies found.
These micro-organisms are found in just a few pieces of amber among the thousands that have been studied, but show a remarkable diversity: unicellular algae, mainly diatoms found in large numbers, traces of animal plankton, such as radiolaria and a foraminifer, spiny skeletons of sponges and of echinoderms.
In the limestone, which is also on the whole horizontally bedded, only radiolaria have been found.
This, indeed, is why oil companies employ fossil experts to identify particular strata of rocks, usually by microfossils, tiny creatures called foraminifera, for example, or radiolaria.
Notes on the strontium content of sea water, Celestite radiolaria, and Strontianite snail shells.
After some success with formaminifera, factor analysis was used with radiolaria, diatoms, and pollen.
The specimen brought up was a terrigenous blue mud (glacial deposit) with some radiolaria.
So the historical inflection points are pretty well known within a couple of thousand years based on deep-sea sediment cores taken world-wide that looked at microfossils diatoms, foraminifera, radiolaria, coccoliths, pollen, dO18, and sediment chemistry.
Diatomic structures, radiolaria, the things that we couldn't see but we can do now.
Instead of such sandy and pebbly material as we find so largely among the sedimentary rocks of the land, wide tracts of the sea bottom at great depths are covered with various kinds of organic ooze, composed sometimes of minute calcareous foraminifera, sometimes of siliceous radiolaria or diatoms.
"The person who does this daily for five minutes as a habit will probably have no need of a physician," adds Haeckel, and with this sage remark he dismisses the subject, branching off into an earnest talk on radiolaria.