Table of Contents
Is a flatworm asymmetrical?
The phylum Platyhelminthes, the flatworms, shows bilateral symmetry. In bilateral symmetry, you create two matching halves by drawing a line from the anterior (head) end of the organism to the posterior (tail) end. This creates two sides that seemingly reflect each other.
What type of symmetry do flatworms and roundworms have?
Both flatworms and roundworms show bilateral symmetry. Both flatworms and roundworms show organ level organization. Both flatworms and roundworms are triploblastic animals.
Is bilateral symmetry only found in flatworms?
Animal Biology Notes. Flatworms and nearly all other animals from here on are bilaterally symmetrical (right and left halves are mirror images).
Why do flatworms have bilateral symmetry?
Most flatworms have a distinct head region that includes nerve cells and sensory organs. The development of a head region, called cephalization, evolved at the same time as bilateral symmetry in animals.
Are Planaria radial or bilateral symmetry?
The presence of the two eyes and lateral horns on the head indicate that the planarian has bilateral symmetry. The planarian will swim in a shallow petri dish by undulating its body across the surface of the dish. Most will stay close to the bottom or the edge of the dish.
Are flatworms multicellular or unicellular?
The flatworms, like the sponges (Phylum Porifera) and Phylum Cnidaria (Hydra, jellyfish, corals, and sea anemones) are multicellular. However, the flatworms are more complex in structure than either of the two other groups.
What are the three main classes of flatworms?
Flatworms belong to the phylum Platyhelminthes , literally meaning “flatworms” in Latin. Flatworm species are divided into three classes: Turbellaria, Trematoda and Cestoda.
What are characteristics of flat worms and roundworms?
Difference Between Flatworms and Roundworms Flatworms are dorso-ventrally flattened while roundworms are more cylindrical in shape and are tapered at both ends. Roundworms have a rigid outer covering called the cuticle. Flatworms are acoelomates that they do not have a body cavity, whereas roundworms are psuedocoelomates. Flatworms have only one opening, which functions as both mouth and anus.
What are the advantages of flatworms?
Flat Shape. The shape of a flatworm allows the species to survive without a circulation system.
What do flatworms do to organisms?
These flatworms are capable of causing diseases in different host organisms, such as fish, dogs, domesticated animals, and humans. Flatworms are invertebrates, characterized by their minute-size or flattened, unsegmented, bilateral, soft body. Their body shape and size are adaptations, owing to lack of complex circulatory and respiratory systems.