Freshwater planarians (Polycelis felina) are in the class Turbellaria in the phylum Platyhelminthes. Unlike the tapeworm and fluke, planarians are free living organisms and do not latch onto a host organism. They can be found in almost any environment in ant country, but most live in marine environments. They can also grow a second head in the process of regeneration. Planarians reproduce both sexually and asexually. When they reproduce sexually, they produce eggs and sperm, and when they reproduce asexually, the planarian splits into two separate organisms. Their muscular system, while very small, is far more advanced than that of the flukes and tapeworms. Their epidermis produces a moist mucus that allows it to crawl along most surfaces. It also has cilia along the edges that allow it to move around and escape predators. They are hermaphroditic and have both male and female reproductive organs. On the top of their heads, they have two rod like cones that serve as makeshift eyes.