Silica Cycle The marine silica cycle is controlled by unicellular eukaryotes that build cell skeletons called frustules(藻细胞；藻壳) Examples:diatoms,dinoflagellates,and radiolarians硅藻，甲藻和放射虫 11 Microbiology.Shanghai Jiao Tong University11 Microbiology, Shanghai Jiao Tong University Silica Cycle • The marine silica cycle is controlled by unicellular eukaryotes that build cell skeletons called frustules (藻细胞; 藻壳) • Examples: diatoms, dinoflagellates, and radiolarians硅藻，甲藻和放射虫