CHLAMYDOMONAS​

CLASSIFICATION OF CHLAMYDOMONAS​

Sub-division :- Algae

Class :- Chlorophyceae

Order :-  Volvocales

Family :- Chlamydomonadaceae

Genus :- Chlamydomonas 

GENERAL CHARATERSTICS OF 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.

IDENTIFICATION

• Sub-division– Algae
  1. Presence of a simple thallus.
  2. Chlorophyll present
  3. Cell wall made of cellulose.
• Class – Chlorophyceae
  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.
• Order – Volvocales
  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.