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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