Dec 27, 2011
Diatoms are found in marine and freshwater habitats.Two basic types are the elongated form (Pennales or pennate diatoms) or wheel-shaped form (Centrales or centric diatoms). In the case of Coscinodiscus, the diatom consists of a two-part frustule. On top of the frustule, an elaborate pattern of pores radiates out from the center; the pores help reduce the weight of the floating diatom and allow diffusion of materials into and out of the cell.
