difference between flatworms, roundworms and segmented worms

Flatworms (phylum Platyhelminthes) are simple animals that are slightly more complex than a cnidarian. Roundworms (phylum Nematoda) have a slightly more complex body plan. Segmented worms (phylum Annelida) are the most complex animals with worm-like body plans. ... Worms are invertebrate animals with bilateral symmetry.

1. Which characteristic is unique to segmented worms and is absent from roundworms and flatworms?
2. Do flatworms have segmentation?
3. What is difference between flatworms and earthworms?
4. What is the difference between annelids and roundworms?
5. What do roundworms and flatworms have in common?
6. Is an earthworm a roundworm?
7. Do flatworms have a body cavity?
8. How do flatworms move?
9. Do flatworms have setae?
10. What diseases do flatworms cause?
11. Where can roundworms be found?
12. What characteristics do flatworms have?

Which characteristic is unique to segmented worms and is absent from roundworms and flatworms?

Explanation: Setae are hair like structure structures present only in segmented worms such as earthworms. It prevents earthworms to slip back from the surface. Setae are absent in Roundworms and Flatworms.

Do flatworms have segmentation?

Taxonomic level: phylum Platyhelminthes; grade of construction: organs derived from three tissue layers; symmetry: bilateral; type of gut: blind; type of body cavity other than gut: none; segmentation: absent; circulatory system: none; nervous system: small bundles of nerves (ganglia), two ventral nerve cords; ...

What is difference between flatworms and earthworms?

As nouns the difference between earthworm and flatworm

is that earthworm is a worm that lives in the ground while flatworm is any of very many parasitic or free-living worms, of the phylum platyhelminthes , having a flattened body with no skeleton or body cavity.

What is the difference between annelids and roundworms?

Annelids are segmented worms whereas roundworms are not segmented. Further, annelids have a true coelom while roundworms have a pseudocoelom. This means annelids have a well-developed mesoderm while roundworms lack a mesoderm. ... Annelids and roundworms are invertebrates with elongated bodies.

What do roundworms and flatworms have in common?

All of them are invertebrates. They all have long, narrow bodies without legs. All worms also have tissues, organs, and organ systems. Worms have bilateral symmetry.

Is an earthworm a roundworm?

Invertebrate animals commonly called "worms" include annelids (earthworms and marine polychaete or bristle worms), nematodes (roundworms), platyhelminthes (flatworms), marine nemertean worms ("bootlace worms"), marine Chaetognatha (arrow worms), priapulid worms, and insect larvae such as grubs and maggots.

Do flatworms have a body cavity?

Flatworms have no body cavity other than the gut (and the smallest free-living forms may even lack that!) and lack an anus; the same pharyngeal opening both takes in food and expels waste.

How do flatworms move?

Flatworms are unsegmented, bilaterally symmetrical worms that lack a coelom (acoelomate) but that do have three germ layers. ... Movement in some flatworms is controlled by longitudinal, circular, and oblique layers of muscle. Others move along slime trails by the beating of epidermal cilia.

Do flatworms have setae?

Flatworms do not have this; their bodies, instead, are covered with cilia, hairlike growths. The gliding locomotion of a flatworm is powered by many tiny cilia on the outer surface of its body.

What diseases do flatworms cause?

Paragonimiasis is caused by infection with a flatworm. That's a parasitic worm also called a fluke or lung fluke because it commonly infects the lungs. Usually, infection comes after eating undercooked crab or crayfish that carry immature flukes. Once swallowed by a person, the worms mature and grow inside the body.

Where can roundworms be found?

Roundworms can live in or on humans, and can cause many problems. They are usually found in soil and stool and can enter the body through the mouth or direct contact with the skin. They can live in the human intestine for a very long time.

What characteristics do flatworms have?

The main characteristics of flatworms (Figure below) include:

• Flatworms 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.