Animal Planet: Understanding Creatures from the Sea
Complete the following table:
Phylum
Cnidaria
Ctenophora
Example organisms
Jellyfish, coral, sea anemones
Comb jellies
Symmetry body form
Radial symmetry
Biradial symmetry
Support system
Hydrostatic skeleton
Comb plates
Circulatory system
No true circulatory system
No true circulatory system
Respiratory system
Diffusion through body surface
Diffusion through body surface
Nervous system and special senses
Nerve net, no true brain
Nerve net, no true brain
Digestive system
Gastrovascular cavity
Gastrovascular cavity
Excretory system
Diffusion through body surface
Diffusion through body surface
Reproductive system
Sexual and asexual reproduction
Sexual and asexual reproduction
Additional Information:
- Cnidarians have specialized cells called cnidocytes that contain stinging structures called nematocysts.
- Ctenophores are also known as comb jellies due to the presence of comb-like structures called ctenes.
- Both phyla are found in marine environments.