Sub-division :- Algae

Class :- Chlorophyceae

Order :-  Volvocales

Family :- Chlamydomonadaceae

Genus :- Chlamydomonas 



  • Thallus is unicellular and motile.
  • The cell is usually oval in shape. Sometimes spherical, oblong, pyriform or ellipsoidal.
  • The cell is surrounded by a cell wall. It is narrow at its anterior end and broad at the posterior end. 
  • Anterior end bears two closely situated flagella (whiplash type). 
  • At the base of each flagellum lies a blepharoplast or basal granule. 
  • A small projection or papilla, known as apical papilla, is present in between the two anteriorly inserted flagella. 
  • At the base of each flagellum one contractile vacuole is present. 
  • Just near the cell wall, towards the anteriolateral part of the cell, lies an orange or red coloured spot, called stigma or eye spot. 
  • The broad posterior part has a large, massive and a single cup-shaped chloroplast. The thin sides of the chloroplast cup extend towards the anterior end. 
  • The broad portion of the chloroplast has a single pyrenoid (sometimes two to many).
  • The cavity of the cup-shaped chloroplast is completely filled with the cytoplasm in which lies a single nucleus. 
  • Many volutin grains, the main reserve food product, are irregularly distributed in the cytoplasm.



  • Sub-division– Algae
    1. Presence of a simple thallus.
    2. Chlorophyll present
    3. Cell wall made of cellulose.
  • ClassChlorophyceae
    1. Presence of a definite nucleus
    2. Chloroplast present. grass green colour
    3. Presence of starch
    4. Reproductive structure motile and flagella equal in length.
  • OrderVolvocales
    1. Thallus motile, 
    2. Protoplast with contractile vacuoles.
  • Family Chlamydomonadaceae
  • Genus Chlamydomonas
    1. Oval or pyriform shape of the thallus which is unicellular
    2. Cup-shaped chloroplast
    3. Presence of an eye spot
    4. Formation of Palmella stage.


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