What are 5 characteristics of worms?

They have five paired organs that act like hearts to pump their blood through large blood vessels. They have a brain and nerve cord. They have reproductive organs and waste-removal organs. Well-developed muscles let the worms crawl through the soil or on top of the ground.

What are characteristics of the phylum Platyhelminthes?

Characteristics of Platyhelminthes They are triploblastic, acoelomate, and bilaterally symmetrical. They may be free-living or parasites. The body has a soft covering with or without cilia. Their body is dorsoventrally flattened without any segments and appears like a leaf.

What are 5 characteristics of Nematoda?

Following are the important characteristics of Nematoda:

• Their body is bilaterally symmetrical and triploblastic.
• They are cylindrical in shape.
• They exhibit tissue level organization.
• Their body has a cavity or pseudocoelom.
• The alimentary canal is distinct, with the mouth and the anus.
• They are sexually dimorphic.

Which morphological features differentiate the members of the phylum Annelida from nematodes and Platyhelminthes?

1 Answer. Platyhelminthes are worms with flat bodies (flatworms), nematodes are worms with cylindrical but not segmented bodies (roundworms). Annelids are cylindrical worms with segmented bodies (they are metameric).

How are annelid worms different from flatworms and roundworms?

In addition to a more specialized complete digestive system, annelid worms have also evolved body features not found in flatworms or nematodes. These features appear in some form in all larger, more complex animals: a coelom, a body cavity between the digestive tube and the external body wall that is lined with tissue.

What are some characteristics of worms?

Characteristics. All worms are bilaterally symmetrical, meaning that the two sides of their bodies are identical. They lack scales and true limbs, though they may have appendages such as fins and bristles. Many worms have sense organs to detect chemical changes in their environments, and some have light-sensing organs.

What are the main characteristics of nematodes?

Nematodes are bilaterally symmetrical, elongate, and usually tapered at both ends. Some species possess a pseudocoel, a fluid-filled body cavity between the digestive tract and the body wall. Like arthropods and members of six other phyla, nematodes secrete an external cuticle that is periodically molted.

What characteristics do roundworms have?

Characteristics of Roundworms: A Simple Structure Roundworms are characterized by a simple worm-like structure with a lack of features such as cilia or a well-defined head. They have an internal body cavity, called a pseudocoelom, which looks like a tube within a tube and runs the whole length of their bodies.

Which of the following body characteristics distinguishes Nematoda from Annelida?

The main difference between Nematoda and Annelida is that Nematoda has a cylindrical body with tapered ends whereas Annelida has a cylindrical body, which is segmented. Therefore, Nematoda is called roundworms while Annelida is called segmented worms.

What morphological characteristics suggest proximity between organisms in the phylum Annelida and phylum Arthropoda?

What morphological characteristic suggests proximity between organisms of the phylum Annelida and arthropods? The segmentation of the body of annelids into metameres makes annelids close to arthropods, since they are also segmented organisms.

What are the characteristics of Platyhelminthes?

The Phylum Platyhelminthes includes the first bilaterally symmetrical animals. Members of this Phylum (Planaria, tapeworms and flukes) are dorsoventrally flattened and have a definite anterior and posterior end. Flatworm bodies are solid with all three tissue layers.

What are the segmented worms in phylum Annelida?

Members of the Phylum Annelida are the segmented worms and are abundant in all habitats. Members include the earthworms, leeches and sandworms. Annelids have a coelom that is fully lined and contains the body organs. The coelom runs from the mouth to the anus.

What are the examples of organisms belonging to phylum Platyhelminthes?

The examples of organisms belonging to phylum Platyhelminthes are: 1 Dugesia (Planaria) These are found in freshwater ponds or slow streams. Their body possesses cilia and has the power of regenerating the lost part. 2 Schistosoma. 3 Fasciola. 4 Taenia solium.

How are annelid worms different from flatworms and nematodes?

Each of these systems is more complex in the annelid than in flatworms or nematodes. In addition to a more specialized complete digestive system, annelid worms have also evolved body features not found in flatworms or nematodes.