Chloroplasts in algae vary widely in shape, structure, and pigmentation depending on the type (or class) of algae. These differences are often used as classification features. Below are types of chloroplasts in different algal groups: Chlorophyceae (Green Algae) Example algae :- Chlamydomonas, Spirogyra,  Oodogonium,  Chara , Ulothrix Chloroplast type :- Cup-shaped, spiral, reticulate, discoid, Girdle shape, Stellate, Plate like Chloroplast Shape   Chlamydomonas - Cup shaped Volvox -  Cup shaped Spirogyra   - Spiral Oodogonium - Reticulate Chara -  Discoid Ulothrix - Girdle shape Zygnema - Stellate or Star shape Mougeoutia - Plate - like, Ribbon shape Pigments Present-  Chlorophyll a, b, carotenoids Phaeophyceae (Brown Algae) Example algae - Fucus, Sargassum Chloroplast type - Discoid or band shaped Chloroplast Shape - Discoid, ribbon-like Pigments Present - Chlorophyll a, c, fucoxanthin Rhodophyceae (Red Algae) Example algae ...