Parameter Tree:
EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PROTISTS > AMOEBOIDS > RADIOLARIANS

Definition:
Radiolarians belong to the class Actinopoda, meaning "ray feet" which refers
to the numerous slender, reinforced pseudopods that radiate from the body.
Like foramniferans, the radiolarians are well represented in the fossil
record, for they have ornate, silica-hardened parts that resist
degradation. Radiolarian shells contribute to the formation of siliceous
rocks such as chert.


Reference:
Gould, J. and W.Keaton. 1996. Biological Science. W.W. Norton and Company. New
York, New York. and Starr, C. and Taggart. 1998. Biology: the unity and
diversity of life. Wadsworth Publishing Company. Belmont, California.