Cell size Diatoms are commonly between 20-200 microns in diameter or length, although sometimes they can be up to 2 millimeters long
Cell wall SiO2or glass frustule
Chloroplasts Many/cell, 3-5 thylakoid membranes/stack
Photo-pigments Chlorophyll a & c, carotenoids
Reproduction: Most often simple cell division, sexual reproduction
Ecological roles Produce deposits (diatomaceous earth), toxicblooms
Common genera Chaetoceros,Pseudonitzschia, Skeletonema
Table 1: Morphological characteristics of diatoms.