What is the basic body plan of a flatworm?
The body plan of the flatworm is bilateral, with a head that leads—a plan that continues in most animals living today. The structure of this bilateral plan is ideal for an active hunter. Flatworms are the first animals to transmit signals from sensory receptors along nerve cells to the brain.
What is the body structure of platyhelminthes?
Flatworms’ bodies are bilaterally symmetrical and they have a defined head and tail region. They have a central nervous system containing a brain and a nerve cord. Clusters of light-sensitive cells on either side of their head make up what are called eyespots.
What type of body plan is observed in platyhelminthes?
Characteristic features of Phylum Platyhelminthes. Their body is dorsoventrally flattened. They exhibit bilateral symmetry.
What is the classification of dugesia?
Tricladida
Dugesia/Order
What is the body plan of Turbellaria?
They are bilaterally symmetrical , are unsegmented, and are acoelomates , which means they do not have a body cavity. Turbellarians are solid because all the space around their digestive cavity is filled with muscle and other tissue.
What is the body plan of porifera?
The most simplistic body plan within the phylum porifera is the asconoid body plan. This is such a simplistic structure because the body plan has only one large internal chamber, called a spongocoel, that is lined with water-filtering choanocyte cells.
Is a flatworm a parasite?
Flatworm, also called platyhelminth, 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.
What are the four classes of Platyhelminthes?
Diversity of Flatworms. Platyhelminthes are traditionally divided into four classes: Turbellaria, Monogenea, Trematoda, and Cestoda (Figure 2).
Is Dugesia and Planaria the same?
Flukes, like other parasitic flatworms, have complex life cycles often involving two or more host organisms. At right, a planarian (Dugesia). Planarians are free-living flatworms, and have a much simpler life history. They inhabit freshwater, and are carnivores (even without teeth) or scavengers.
Are Dugesia Acoelomates?
What class is dugesia in? How do Dugesia feed? By sucking food through its mouth and into a tubular pharynx leading to the gastrovascular cavity. acoelomate, unsegmented, bilaterally symmetrical worms, no body cavity, one opening.
What makes Turbellaria unique?
Like many other members of the Phylum Platyhelminthes, Turbellarians have a dorsoventrally flattened body that is bilaterally symmetrical. The flattened body shape in these organisms is attributed to the fact that flatworms do not have a true body cavity, as such, they are known as acoelomates.
What are the features of Turbellaria?
Major Attributes:
- True bilateral symmetry.
- Dorso-ventral flattening of the body.
- Unsegmented.
- Ciliated epidermis.
- System of sheathed nerve fibers.
- Parenchyma between the epidermis and the gastrodermis.
- Some cephalization.
- Blind ending gut.
What are three types of body symmetry?
Animals can be classified by three types of body plan symmetry: radial symmetry, bilateral symmetry, and asymmetry.
What makes a flatworm a parasite?
What are the 3 classes of flatworms?
The Phylum: Platyhelminthes includes the flatworms (Planaria, flukes & tapeworms) Three Classes treated here are Turbellaria, Trematoda and Cestoda.
Are flatworms Acoelomates?
Flatworms are acoelomate, triploblastic animals. They lack circulatory and respiratory systems, and have a rudimentary excretory system. This digestive system is incomplete in most species.
What is the classification of Dugesia?
Turbellaria
Dugesia/Class
Does Dugesia have a body cavity?
Body Wall of Dugesia Tigrina: Both these layers are separated by a basement membrane. The space between muscle layer and the alimentary canal is filled with a special type of tissue called mesenchyme or parenchyma, therefore, no coelom or body cavity is found in it.
Platyhelminthes are traditionally divided into four classes: Turbellaria, Monogenea, Trematoda, and Cestoda (Figure 2).
How can a person catch a Dugesia?
Planarians are free-living flatworms that live in quiet ponds or bodies of water. In some areas you can even catch a few planarian by attaching a piece of liver to a fish hook and a sinker and dropping it into the water.
How can a person catch a dugesia?
Is class Turbellaria parasitic?
characteristics and taxonomy Members of all classes except Turbellaria are parasitic during all or part of the life cycle.
How does a Dugesia survive outside of water?
The dugesia cannot survive outside of the water, so biologists studying it must make sure that the specimen has plenty of water that is aerated. The dugesia does have an excretory system to remove wastes. Tiny cells, called flame cells, line the lateral edge of the organism and function to remove waste.
What kind of excretory system does the Dugesia have?
The dugesia does have an excretory system to remove wastes. Tiny cells, called flame cells, line the lateral edge of the organism and function to remove waste. The dugesia can reproduce sexually, and all dugesia are hermaphrodites. Two dugesia will pair up and fertilize each other’s eggs. Those eggs are then released in a cocoon.
What happens when you cut a Dugesia in half?
The organism will pull itself in half and the tail portion will regeneratea new head, and the head portion will regenerate a new tail. This process can be replicated in the lab by using a razor blade or scalpel to cut the dugesia in half. In a couple of weeks, you should have two dugesia swimming around in your petri dish. QUESTIONS ___1.
How does a Dugesia planarian get its oxygen?
If you shine a flashlight on the planarian, it will attempt to move out of the light. The planarian does not have gills or lungs, it obtains its oxygen by simple diffusionover its flat body. The dugesia cannot survive outside of the water, so biologists studying it must make sure that the specimen has plenty of water that is aerated.
What do you need to know about Dugesia?
In this article we will discuss about Dugesia:- 1. Habit and Habitat of Dugesia 2. Structures of Dugesia 3. Body Wall 4. Locomotion 5. Digestive System 6. Respiratory System 7. Excretory System 8. Nervous System 9. Reproductive System 10.
What makes up the body wall of Dugesia tigrina?
Body Wall of Dugesia Tigrina: The body wall is made of an outer epidermis and inner muscle layers. Both these layers are separated by a basement membrane. The space between muscle layer and the alimentary canal is filled with a special type of tissue called mesenchyme or parenchyma, therefore, no coelom or body cavity is found in it.
What kind of nerve endings does the Dugesia have?
The sensory fossae and the auricle grooves are supplied with many nerve endings. Dugesia digestion tract consists of a central non-pigmented tubular pharynx. Like the other triclads, Dugesia’ s gut consists in three ramified branches. Each branch consists of ceca, which delivers the nutrients to the body.
What kind of care does a dugensia tigrina get?
Dugensia tigrina produces a cocoon for every group of offspring produced, and provides provisioning. Otherwise, there is no parental care. ( Vreys, et al., 2002) There is no current record of the highest, lowest, and average lifespans of Dugesia tigrina.
