The habitats of flatworm species vary widely. Some flatworm species are free-living and live in fresh, shallow water. However, nearly half of flatworm species are parasitic, meaning they need to live in a host organism t... More »

According to Encyclopædia Britannica, flatworms are mostly parasitic, soft-bodied invertebrates that include tape worms, flukes and planarians. Lacking circulatory, respiratory and skeletal systems, flatworms feature uns... More »

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Flatworms move in various ways. Some use muscular movements of their bodies, whereas others have soles underneath for locomotion. Some spit mucus and use it as a rope to pull themselves. Some aquatic species use their ci... More »

Not much is known about how flatworms protect themselves. Though flatworms have poor eyesight, they are able to sense dark and light and perhaps direction and use these senses to seek out dark places under rocks to hide.... More »

Among flatworms with a distinguishable excretory system, the usual method for voiding waste is through flame cells that are arrayed along the sides of the worms' bodies and connected to main ducts that drain its tissues ... More »

Platyhelminthes, or flatworms, live in a variety of habitats, including in fresh and salt water, in soil, and in animal tissue as parasites. A majority of flatworm species are parasitic. More »

Nearly all animals referred to as worms are invertebrates, including earthworms, and by definition, invertebrates do not have bones. Exceptions include worm lizards, such as the Caecilians and Anguis lizards, which look ... More »