[Phylum] Bacillariophyta [Morphology] Unicellular; some colonial [Reproduction] Asexual, with progressive reduction in cell size. Sexual reproduction is triggered when the cells reach a certain minimal size. [Example] Dinobryon [Common name] 
Diatoms
E u g l e n o i d s
D i n o f l a g e l l a t e s
D i a t o m s
G o l d e n a l g a e
B r o w n a l g a e
G r e e n a l g a e
R e d a l g a e