S: The Flatworm
BC: THANK YOU! | Resources | Ryan photographic. (2009). Retrieved from http://www.ryanphotographic.com/images/JPEGS/Pseudobiceros gloriosus, Kadavu, Fiji, 2007.jpg Dansereau, V. (2012). ehow. Retrieved from http://www.ehow.com/facts_7501425_nematodes-flatworms.html Curtis, H. (2009). Phylum platyhelminthes. Retrieved from http://www.infusion.allconet.org/webquest/PhylumPlatyhelminthes.html
FC: The Flatworm | Daniel Mejía
1: So, what makes me fit into the Phylum Platyhelminthes, commonly known as the flatworms? | Flatworms have unsegmented bodies that are soft. They are invertebrates which have two sides to their body structure and only three embryonic germ layers: Ectoderm, Mesoderm, and Endoderm. There is cephalization, which is an evolutionary change that can lead to head development. | Flatworms do not have the organisms necessary for respiration and circulation, as well as they have no body cavity. Therefore, they depend on diffusion, which uses their flat shape to pass nutrients and oxygen throughout their bodies.
2: Good or Bad? | Flatworms are both beneficial and harmful towards earth and the environment. They are beneficial, because they are used for insect control but can also provide foods for other insects. Although they are useful for insect control, flatworms are incredibly dangerous to humans and other organisms, since they can cause infections in the tissues. Most of the times, the flatworms cause infections in the intestines. Unfortunately, more than 200,000 million people worldwide have suffered infections by flatworms.
3: Time for Division... | The phylum Platyhelminthes consists of about 20,000 species of flatworms. It is obvious why biologists and taxonomists should further divide this phylum for easier classification. There are four classes pertaining to this phylum, but the three main ones include Turbellarians, Trematoda, and Cestoda.
4: This is an example of a Turbellarian, a free-living flatworm. This organism is the Pseudoceros dimidiatus. | The Botulus microporus is a type of Trematoda, or fluke. | This Taenia saginata is a type of tapeworm, or Cestoda
5: Show Me the Facts! | Many flatworms use their flame cells to remove excess water from their bodies. Flatworms have a single opening to their own stomachs! Flatworms can reproduce by regeneration, or they can use their own male and female organs to reproduce sexually or asexually. Incredible! Flatworms can use small body hairs to glide over or slightly under water surfaces. Amazing! Most turbellarians live in marine or fresh water. Flukes infect the internal organs of their host. Tapeworms are adapted to life inside their hosts' intestines.