But whether they are sister lineages or if the Foraminifera should be included within the Radiolaria is not known.
12.
However, various sea sponges and microorganisms, such as diatoms and radiolaria, secrete skeletal structures made of silica.
13.
The oil comes from an accumulation of radiolaria that died and fell on to the seabed in the absence of oxygen, he explained.
14.
Likewise, some holoplanktonic protozoa ( Radiolaria ), some sponges, and some plants ( leaf phytoliths ) use silicon as a structural material.
15.
Radiolaria have left a geological record since at least the Ordovician times, and their mineral fossil skeletons can be tracked across the K Pg boundary.
16.
In 1904, Ernst Haeckel described a number of species of Radiolaria, including " Circogonia icosahedra ", whose skeleton is shaped like a regular icosahedron.
17.
He was particularly interested in a unicellular group of protists called diatoms, but he also studied, and named, many species of radiolaria, foraminifera and dinoflagellates.
18.
Ernst Haeckel ( 1834 1919 ) painted beautiful illustrations of marine organisms, in particular Radiolaria, emphasising their symmetry to support his faux-Darwinian theories of evolution.
19.
He was followed by Johannes Peter M�ller and Ernst Haeckel who both described planktonic protists, radiolaria, from the Bay of Villefranche ( M�ller 1858; Haeckel 1860 ).
20.
In the early 20th century, Ernst Haeckel described ( Haeckel, 1904 ) a number of species of Radiolaria, some of whose skeletons are shaped like various regular polyhedra.
