Cnidarians can be completely different from other invertebrates, but at the same time, they can be quite similar. Below are a few examples.
Similarities:
- Cnidaria and Platyhelminthes expel undigested material through the mouth
- Cnidaria and Planaria both lack specialized circulatory and respiratory systems
- Cnidaria and Platyhelminthes both lack a centralized nervous system
Differences:
- Platyhelminthes have much more developed nervous systems compared to Cnidarians
- Cnidaria have nematocysts as protection. Other phyla have different methods (ie. Spicules in Porifera
- Nematoda have a complete gut, Cnidarians do not
Similarities:
- Cnidaria and Platyhelminthes expel undigested material through the mouth
- Cnidaria and Planaria both lack specialized circulatory and respiratory systems
- Cnidaria and Platyhelminthes both lack a centralized nervous system
Differences:
- Platyhelminthes have much more developed nervous systems compared to Cnidarians
- Cnidaria have nematocysts as protection. Other phyla have different methods (ie. Spicules in Porifera
- Nematoda have a complete gut, Cnidarians do not
Above is a picture of a sea anemone and on the right is the ventral side of a octopus. Can you see and similarities or differences?
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