Acetabularia is a genus of green algae in the family Polyphysaceae,Typically found in subtropical waters, Acetabularia is a single-celled organism, but gigantic in size and complex in form, making it an excellent model organism for studying cell biology. In form, the mature Acetabularia resembles the round leaves of a nasturtium, is 0.5 to 10 cm tall and has three anatomical parts: a bottom rhizoid that resembles a set of short roots; a long stalk in the middle; and a top umbrella of branches that may fuse into a cap. The single nucleus of Acetabularia is located in the rhizoid, and allows the cell to regenerate completely if its cap is removed. The caps of two Acetabularia may also be exchanged, even from two different species.[citation needed] In addition, if a piece of the stem is removed, with no access to the nucleus in the rhizoid, this isolated stem piece will also grow a new cap. Chlorophyta is a division of green algae, informally called chlorophytes. The name is used in two very different senses, so care is needed to determine the use by a particular author. In older classification systems, it refers to a highly paraphyletic group of all the green algae within the green plants (Viridiplantae) and thus includes about 7,000 species of mostly aquatic photosynthetic eukaryotic organisms.

Acetabularia acetabulum is a unicellular eukaroyote, which is green in colour. It is a photosynthetic green algae containing chloroplast. It is a single celled organism, but gigantic in size, complex in form, making it an excellent model organism for studying cell biology. It belongs to the Chlorophyta.

Acetabularia acetabulum is a unicellular eukaroyote, which is green in colour. It is a photosynthetic green algae containing chloroplast. It is a single celled organism, but gigantic in size, complex in form, making it an excellent model organism for studying cell biology. It belongs to the Chlorophyta.