Questions and Answers
Which of the following are classes of annelids? (Select all that apply)
What percentage of annelid species does Class Polychaeta represent?
60%
Earthworms are classified under Class Polychaeta.
False
What is an example of a Polychaeta?
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The term 'peripodium' refers to a '______ foot' structure found in annelids.
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What are setae?
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Study Notes
Classes of Annelids
- Primary classes: Class Polychaeta and Class Clitellata.
Class Polychaeta
- Largest class within the annelids, comprising around 60% of all annelid species.
- Exclusively marine organisms inhabit deep seas or shallow waters.
- Many species are adapted to live in tubes constructed from sand or mud in ocean environments.
Subclass Oligochaeta
- This subclass includes free-living earthworms and is known for its soil-ingesting capabilities.
- Leeches were previously classified separately but are now included here as ectoparasites.
- Earthworms play a vital role in soil ecology by consuming organic material, including bacteria and spores.
Example of Polychaeta
- Nereis virens, commonly known as the clamworm, serves as a representative example of Polychaeta.
Peripodium
- Refers to the "side foot," a paired structure that enhances movement and stability.
Setae
- Defined as heavy bristles present on annelids, aiding in locomotion and anchoring in the substrate.
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Description
Explore the primary classes of annelids, focusing on Class Polychaeta and Subclass Oligochaeta. Learn about their habitats, adaptations, and ecological roles. Understand key features like peripodia and setae that aid in their movement.
