Animal Kingdom Part 2

Porifera (Sponges):

• Sponges are simple, aquatic animals that lack true tissues and organs.

• They are filter feeders and have a porous body structure.

• Sponges are considered one of the most primitive animal phyla.

Coelenterata (Cnidarians):

• Cnidarians include organisms like jellyfish, corals, and sea anemones.

• They have specialized cells called cnidocytes that contain stinging structures (nematocysts) used for defense and capturing prey.

• Cnidarians exhibit radial symmetry and have a simple body plan.

Ctenophora (Comb Jellies):

• Ctenophores, or comb jellies, are gelatinous marine animals.

• They have eight rows of ciliated combs, which they use for locomotion.

• Ctenophores exhibit radial symmetry and are relatively simple in structure.

Platyhelminthes (Flatworms):

• Flatworms are bilaterally symmetrical animals with three germ layers (triploblastic).

• They include organisms like tapeworms and flukes.

• Flatworms have a simple digestive system and lack a true body cavity (coelom).

Aschelminthes (Roundworms or Nematodes):

• Nematodes are unsegmented, cylindrical worms with a tough cuticle.

• They are bilaterally symmetrical and triploblastic.

• Nematodes are found in various environments and can be free-living or parasitic.