Questions and Answers
What does Class Scyphozoa include?
What is a scyphistoma?
A larva of a scyphozoan, consisting of a very small sessile polyp that successively splits off free-swimming medusas.
What is strobilation?
Repeated linear budding of individuals, as in scyphozoan ephyrae.
What does strobila refer to?
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What is the function of a rhopalium?
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Which of the following describes a ring canal?
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What are gastric filaments?
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What are tentacles used for in invertebrates?
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What are oral arms?
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What are gastric pouches?
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How does reproduction occur in Aurelia?
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Study Notes
Class Scyphozoa
- Encompasses most large jellyfish, commonly referred to as "cup animals".
Scyphistoma
- A larval stage in scyphozoans, characterized by a small sessile polyp.
- This polyp reproduces asexually by budding off free-swimming medusas.
Strobilation
- A process involving repeated linear budding, producing ephyrae in scyphozoans.
- Also refers to the formation of reproductive organs in tapeworms.
Strobila
- Refers to a scyphozoan polyp with a stacked arrangement of ephyrae.
- Additionally describes the chain of proglottids found in tapeworms.
Rhopalium
- Club-shaped sensory organs located on the margins of certain jellyfish.
- Plays a role in sensory perception, functioning as tentaculocysts.
Ring Canal
- A circular water tube encircling the esophagus of echinoderms.
- In jellyfish, it connects the radial canals at the edge of the umbrella.
Gastric Filaments
- Rows of filaments lining the gastric cavity, specialized to kill or paralyze prey.
- Also known as phacella, these structures aid in food processing.
Tentacles
- Slender and flexible appendages primarily located around the mouths of invertebrates.
- Serve multiple functions including grasping, locomotion, and housing sensory organs.
Oral Arms
- Anatomical structures specific to "true" sea jellyfish, also termed "palps".
- Assist in capturing, ingesting food, and contain stinging cells for prey immobilization and reproduction.
Gastric Pouches
- The pouched radial sections of a scyphozoan's stomach that aid in digestion.
Reproduction in Aurelia
- Asexual methods include budding, fission, and fragmentation.
- Sexual reproduction occurs in the medusa form, resulting in the creation of embryos.
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Description
Test your knowledge of the Phylum Cnidaria, particularly the Class Scyphozoa, through this flashcard quiz. Explore important terms such as scyphistoma and strobilation while learning about the life cycles and characteristics of jellyfish. Ideal for students studying marine biology or related fields.
