Caulerpa ellistoniae

Caulerpa ellistoniae is a species of seaweed in the family Caulerpaceae.

The seaweed has a robust stolon with a diameter of approximately 2 to 4 mm. The dark green fronds are erect and branch many times with a length of 10 to 25 cm.

It is found along the coast in the South West region of Western Australia spreading north as far as Perth usually in deeper water.