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Questions and Answers
What are cnidarians known for?
What are cnidarians known for?
- Use tentacles to catch prey (correct)
- Unique stinging cells (correct)
- Have a skeleton
- Three body types
Cnidarians are triploblastic.
Cnidarians are triploblastic.
False (B)
What are the two body types of cnidarians?
What are the two body types of cnidarians?
Polyp and medusa
The marine, solitary or colonial polyps with no medusa stage are known as __________.
The marine, solitary or colonial polyps with no medusa stage are known as __________.
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What stage do cubozoans have?
What stage do cubozoans have?
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Hydrozoans are mainly freshwater species.
Hydrozoans are mainly freshwater species.
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Which class of cnidarians primarily inhabits coastal waters and has a prominent medusa form?
Which class of cnidarians primarily inhabits coastal waters and has a prominent medusa form?
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Study Notes
Cnidarians Overview
- Cnidarians are characterized by unique stinging cells called cnidocytes, used for capturing prey.
- Diploblastic in structure, having two germ layers: ectoderm and endoderm.
- Two main body forms: polyp and medusa.
- Polyp form has a dorsal mouth surrounded by tentacles, while the medusa features a mouth located on the lower concave surface.
Class Anthozoa
- Exclusively marine organisms, consisting of solitary or colonial polyps.
- Lacks a medusa stage, meaning they exist only in the polyp form.
- Common examples include sea anemones and corals, both crucial for marine ecosystems.
Class Cubozoa
- Found in tropical and subtropical waters, known for their potent stings.
- Exhibits a polyp stage, although the medusa form is more well-known.
- Box jellyfish are the most notable members, recognized for their cube-shaped medusa.
Class Hydrozoa
- Primarily marine, with some freshwater species existing within this class.
- Includes interesting forms like the Portuguese man of war, which is made up of a complex colony of polyps.
Class Scyphozoa
- Predominantly marine with a lifestyle centered around coastal waters.
- Free-swimming with the medusa stage as the most prominent life form, often recognized for their large size and gelatinous bodies.
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