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Questions and Answers
What class of Cnidarians includes hydra, hydroids, and the Portuguese man o' war?
What class of Cnidarians includes hydra, hydroids, and the Portuguese man o' war?
- Scyphozoa
- Anthozoa
- Hydrozoa (correct)
- Cubozoa
What is the adult form of sea jellies in the class Scyphozoa?
What is the adult form of sea jellies in the class Scyphozoa?
Medusa
The class Cubozoa consists of box jellies as adults and medusae as juveniles.
The class Cubozoa consists of box jellies as adults and medusae as juveniles.
False (B)
What defines the class Anthozoa?
What defines the class Anthozoa?
Staurozoa resembles a medusa but is typically attached to the substratum by a sort of ______.
Staurozoa resembles a medusa but is typically attached to the substratum by a sort of ______.
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Study Notes
Classes of Cnidarians
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Hydrozoa: Includes hydra, hydroids, and the Portuguese man o' war. Exhibits a life cycle where adult forms are polyps, while juveniles are in the medusa stage.
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Scyphozoa: Commonly known as sea jellies, this class has medusae as adults, characterized by a spherical shape, and juvenile forms develop into polyps.
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Cubozoa: Comprising box jellies and sea wasps, members have boxed-shaped medusae in adulthood and polyp forms during juvenile stages.
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Anthozoa: Encompasses sea anemones and corals, which exclusively exist in the polyp stage throughout their life cycle, lacking a medusa phase entirely.
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Staurozoa: Known as star jellies, this class exhibits characteristics similar to a medusa but remains attached to the substrate by a stalk originating from the opposite side of the mouth.
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