Ans. Radiolaria are a type of amoeboid protists that are responsible for the production of mineral skeletons. The skeletons are usually of silica (SiO2), they have a central capsule that divides the cell into inner portion and outer portions, this is called endoplasm and ectoplasm. Radiolaria are generally heterotrophs (who eat other things), but they may also include protist algae as being endosymbionts.