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Flat headed worm1/20/2024 As such, they are also often referred to as protostomes.Īpart from these higher classifications, the phylum is further divided into the following classes:Ĭlass Turbellaria is composed of about 3,000 species of organisms spread across at least 10 orders. Protostomia- As members of this clade, flatworms comprise three germ layers. This classification includes animals with bilateral symmetry consisting of a head and tail (as well as a dorsal part and belly). In some classifications, they are also classified under the basal animal clade Eumetazoa since they are metazoans that fall under the animal kingdom (Kingdom Animalia).īilateria- Flatworms also fall under Bilateria in Eumetazoa. Kingdom: Animalia - Flatworms fall under the animal kingdom that is characterized by multicellular eukaryotic organisms. On the other hand, they make up the largest phylum among acoelomates. With more than 20,000 species currently identified, the phylum Platyhelminthes makes up one of the largest phyla after chordates, mollusks, and arthropods. Thus, they are highly invasive and frequently show up in new regions.Flatworms (Platyhelminthes) are a group of bilaterally symmetrical, acoelomate, soft-bodied invertebrate animals found in marine, freshwater as well as moist terrestrial environments. They easily hide among objects and in soil where there's moisture, so moving any type of container or plants around the world has allowed them to colonize new areas. "However, some have been here for over 100 years, so they are well established. are not native," says Matt Bertone, an entomologist at NC State University. "The majority of land flatworms in the U.S. Over the course of the past couple of hundred years, global commerce has helped the hammerhead worm wriggle its way into most suitable habitats in the world - and there are a lot of suitable habitats out there, although you're unlikely to find them in a desert or at the top of a mountain. These predatory planarians are native to tropical and subtropical regions of the globe, so they love wet, warm spots. But hammerhead worms, all members of the genus Bipalium, aren't something to get too fussed about as they're not a new thing in the U.S., or in most places in the world - they've been common residents of American gardens since the early 1900s.
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