Another organism might eat those eggs and development begins in the digestive system. Eggs many be deposited in the feces of one species. Since many flatworms are parasites, they have lifecycles in different hosts. While we made them seem easy to find, it's sometimes very hard to track them down. There are species in many freshwater and saltwater environments as well as inside larger organisms. Since they have no specialized circulatory system, their flatness gives them a greater surface area to absorb more oxygen. Flatworms get most of their oxygen through diffusion. Most are very small and not obvious immediately. If you find water, there's a good chance flatworms will be around. Flatworms have very simple nervous systems. Those spots are not eyes, but they do sense light. They're black with two white spots on their heads. They are freshwater flatworms that have a head like an arrow. Planaria are harmless flatworms that are often used in your biology labs. It's another parasitic species that has a close relationship with man and other mammals. Cats, dogs, and even you could wind up with tapeworms. They live in intestinal tracts of many species. You'll learn about a few classic examples of flatworms in your classes. Many scientists believe there are hundreds of species we will still discover. They are found in every environment that has water. The big thing you should remember is that they are flat. They are super-primitive organisms that were the first to develop mesoderm. Sure we can tell you that there are over 20,000 known species. But that's the one obvious connection between all of the worms in this group. The nonparasitic animals usually called flatworms, however, resemble sea slugs or worms and are generally harmless to humans.We have to run out of steam there. The flatworm family, Platyhelminthes, consists of many dangerous parasites such as tapeworms and flukes, which are infamous for attacking livestock, humans, and many other animals-at least one species is known to infest whales. The word "flatworm" is used as an umbrella term for a vast amount of primitive creatures, ranging from as large as two feet long to completely invisible to the naked eye. "I got a flatworm! Guess it forgot its spareworm."Ī flatworm in real life.
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