Class Turbellaria : The free living flat worms
- 1. Male reproductive organs: Numerous paired testes lie along each side of the worm. Sperm ducts (vas deferens) open into seminal vesicle. ...
- 2. Female reproductive organs: The female system has one to many pairs of ovaries. Oviducts start from the ovaries and open into the genital chamber. ...
- 3. Fertilization: Turbellarians are monoecious. ...
- 4. Development: Eggs are laid with or without a gel-like mass. ...
- 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 characteristics of Turbellaria?
Turbellaria is comprised of flatworm species (turbellarians) that are not exclusively parasitic and possess a body covered externally with vibrating cilia. They have flat, ribbon-like, or leaf-like shapes.
What is the classification of the Turbellaria?
TurbellariaTurbellaria / Scientific name
What are 3 characteristics of flatworms?
Features of FlatwormsFlatworms have no true body cavity, but they do have bilateral symmetry. ... Flatworms have an incomplete digestive system. ... Flatworms do not have a respiratory system. ... There are no blood vessels in the flatworms.More items...•
What makes Turbellaria unique?
Turbellarians are also famous for their ability to regenerate when cut into pieces, and some species reproduce by splitting their bodies into two of these clones.
What are 5 characteristics of phylum Platyhelminthes?
Platyhelminthes have the following important characteristics: They are triploblastic, acoelomate, and bilaterally symmetrical. They may be free-living or parasites....Unique Characteristics of PlatyhelminthesPresence of flame cells.Ladder-like nervous system.Presence of parenchyma in the body cavity.Self-fertilization.
How are flatworms classified and what are their characteristics?
They are bilaterally symmetrical, triploblastic, they lack an anus, and they have no body cavity other than the gut. Platyhelminthes are divided into three classes: Turbellaria, a free-living marine species; Monogenea, ectoparasites of fish; Trematoda, internal parasites of humans; and other species.
Where are Turbellaria found?
Turbellarians lack a respiratory and circulatory system, so they are extremely thin and require aquatic (or very moist) habitats. They can be found in ponds, lakes, streams, springs, and even cave streams, usually in submerged leaf litter or under rocks.
What are the two most obvious characteristics of flatworms?
The typical flatworm body is flattened and leaflike or tapelike. The head may be set off from the body or grade imperceptibly into it. The anterior (head) end can usually be distinguished from the posterior end in free-living forms by the presence of two pigment spots, which are primitive eyes.
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.
How does a Turbellarian move feed and reproduce?
Turbellarians move around using cilia on their epidermis or by undulating their body with their muscles. Most turbellarians live in water, either fresh or salt water. A few species live on land in damp habitats like leaf litter. Turbellarians reproduce by fission and regeneration, or sexually.
How do Turbellaria reproduce asexually?
Turbellarians are simultaneous hermaphrodites and lay eggs bundled into cocoons. The young undergo direct development and hatch as juveniles. Spiral cleavage is prevalent. Some turbellarians can reproduce asexually by fission.
How do Turbellaria digest food?
The digestive system of turbellarians typically consists of mouth, pharynx, and intestine. In the order Acoela, however, only a mouth is present; food passes directly from the mouth into the parenchyma, to be absorbed by the mesenchymal cells. The excretory system consists of protonephridia.