The Chlorophyceae are one of the classes of green algae, distinguished manly on the basis of ultrastructural morphology. The following orders are typically recognised:
- Dunaliellales
- Chlamydomonadales (e.g. Chlamydomonas)
- Volvocales (e.g. Volvox)
- Chlorococcales (e.g. Chlorella)
- Oedogoniales (e.g. Oedogonium)
- Sphaeropleales
- Chaetophorales
- Microsporales
- Tetrasporales (e.g. Tetraspora)