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en.wikipedia.org/wiki/Flatworm

Unlike other bilaterians, Platyhelminthes have no internal body cavity, so are described as acoelomates. They also lack specialized circulatory and respiratory organs, both of these facts are defining features when classifying a flatworm's anatomy. Their bodies are soft and unsegmented.

biologywise.com/flatworm-facts

Flatworms are some of the most interesting creatures to study about and that is exactly what we shall be doing in this following article by giving you some interesting flatworm facts. Continue reading for more information.

animalcorner.co.uk/animals/flatworms

Flatworms are the simplest of the worm groups. There are about 20,000 species in this group. Flatworms are found many places and can be free living or parasitic. A parasite lives off another living thing called a host and can be harmful. One of the best known flatworms is the tapeworm.

www.encyclopedia.com/.../zoology-invertebrates/platyhelminthes

Platyhelminthes. The phylum name Platyhelminthes literally means "flatworms." Members of this phylum are soft, thin-bodied, leaf or ribbonlike worms, including the familiar planaria of ponds and streams, as well as the flukes and tapeworms parasitic in human and other animal bodies.

www.shapeoflife.org/resource/about-flatworms

GENERAL INFORMATION ABOUT FLATWORMS. Read about flatworms and take a quiz here, then read this article from Kennesaw State University: Platyhelminthes - "the flatworms" General information about flatworms; Read about the advantages and disadvantages of being hermaphroditic; A primer on marine flatworms for K-12 Students

www.britannica.com/animal/flatworm

Flatworm: Flatworm, any of the phylum Platyhelminthes, a group of soft-bodied, usually much flattened invertebrates. A number of flatworm species are free-living, but about 80 percent of all flatworms are parasitic—i.e., living on or in another organism and securing nourishment from it. They are bilaterally

animaldiversity.org/accounts/Platyhelminthes

Flatworms lack a respiratory or circulatory system; these functions take place by absorption through the body wall. Nonparasitic forms have a simple, incomplete gut; even this is lacking in many parasitic species. Movement in some flatworms is controlled by longitudinal, circular, and oblique layers of muscle.

www.quora.com/What-are-some-fun-facts-about-the-flatworm

I looked up and found what I think are quite interesting facts about the humble flatworm. There are more than 20,000 species of flatworm. I can only think of one - the tapeworm. They can regenerate; a new worm can form from a broken off piece of the original worm. They also have both male and female parts.

sites.google.com/site/flatworms21/interesting-facts

Interesting Facts Flatworms can glide over surfaces, or the underside of a surface film of water, using small body hairs for movement. The stomach is like a sack. The food goes into the sack through the mouth. Once the food is taken into the body, the rest is thrown back out of the mouth. (They have no anus).

www.dec.ny.gov/animals/87958.html

General Information about Flatworms or Planaria (Platyhelminthes) Life history: Different kinds of flatworms may reproduce sexually, or by dividing, depending on the environmental conditions. Some kinds will live from weeks to a few months; others that reproduce by dividing can live indefinitely.