Acanthozoon sp.
This species name is also known as Thysanozoon sp.According to Dr. Richard C. Willan: Beyond any doubt, Thysanozoon is the more widely known generic name both in scientific literature and in popular publications and this has been the way for a long time, so it is recommended all photos showing flatworms with papillae on their dorsal surface assembled under the name Thysanozoon sp.