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• Named after greek prasinos = green
• Occurrence: primary marine flagellates, but some coccoid and sessile forms as well
  
  
  left: Pyramimonas; right: Nephroselmis
• Flagella: one to 16; uniflagellar species suggested to be placed in separate order (Pedinophyceae); flagella emerge from apical depression
• Elaborated organic scales cover flagella and cell membrane in 1-5 layers; underlayer of small, square scales common
  
  
• Plastid: one plastid, often lobed, with one pyrenoid; in some species an eye-spot occurs within the plastid
  
• Accessory pigment: prasinoxanthin (not in all species)
• Sexual reproduction: isogamy