The illustration depicts a planarian, which is a type of flatworm belonging to the phylum Platyhelminthes. It is characterized by its soft, flat body, showcased here with a predominant pink and light pink coloration. Planarians are known for their remarkable regenerative abilities, often used as model organisms in studies of regeneration and developmental biology. The organism's anatomy features distinct cellular structures that are valuable for various biological research fields including zoology, parasitology, and systematics.