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Define Phyla Ctneophora, Platyhelminthes and Aschelminthes

Phylum Ctneophora:

1. Commonly known as sea walnuts or comb jellies, exclusive marine habitats, radial symmetry body shape

2. Diploblastic animals with tissue level organization

3. Presence of eight external rows of ciliated comb plates which serve the purpose of locomotion

4. Digestion is both extracellular and intracellular

5. Organisms are hermaphrodite (sexes are not separate)

6. Mode of reproduction – sexually. Fertilization is external and development occurs indirectly

7. Characteristic feature – Organisms can emit bioluminescence (capability to emit light)

Example of organisms belonging to this phylum are Pleurobrachia and Ctenoplana

Figure 1 Organism belonging to phylum Ctenophora

A. PleurobrachiaPhyla Ctenophora, Platyhelminthes and Aschelminthes

 

Phylum Ctenophora:

1. Commonly known as sea walnuts or comb jellies, exclusive marine habitats, radial symmetry body shape

2. Diploblastic animals with tissue-level organization

3. Presence of eight external rows of ciliated comb plates which serve the purpose of locomotion

4. Digestion is both extracellular and intracellular

5. Organisms are hermaphrodite (sexes are not separate)

6.  Mode of reproduction – sexually. Fertilization is external and development occurs indirectly

7.  Characteristic feature – Organisms can emit bioluminescence (capability to emit light)

Example of organisms belonging to this phylum are Pleurobrachia and Ctenoplana

 

A. Pleurobrachia

 

Phylum Platyhelminthes:

1.      Bilateral symmetrical body shape, triploblastic with organ level of organization, acoelomate

2.      Also known as flatworms due to their dorso-ventrally flattened body.

3.      Usually found as endoparasites inside humans or animal’s body. Presence of hook or sucker in parasitic forms of organisms

4.      Some organisms of this phylum absorb nutrients directly from the host’s body through their body surface

5.      Life processes like osmoregulation and excretion is carried out by specialized cells called flame cells

6.      Organisms are hermaphrodite

7.      Fertilization occurs internally and development is through larval stages

8.      Some organisms are capable of regenerating their body organs. For example Planaria

Examples of organisms belonging to this phylum – Taenia (Tapeworm), Fasciola (Liver fluke)

 

 

Phylum Aschelminthes:

1.      Commonly known as roundworms, as their body is circular when dissected cross-sectional.

2.      Bilateral symmetry, triploblastic with organ level organization, free-living worms inhabiting either on land or water or as parasites.

3.      Pseudocoelomate animals

4.      Presence of alimentary canal with a well-developed muscular pharynx

5.      Presence of an excretory tube to remove wastes and toxins from the body cavity to the excretory pore

6.      Organisms are dioecious (sexes are separate). Female is longer than male organisms

7.      Fertilization is internal and development may be either direct or indirect.

8.      Organisms belonging to this phylum – Ascaris (Roundworm), Wucherechia (Filaria worm)

Phylactneophora Platyhelminthes Aschelminthes Assignment Help