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Questions and Answers
Which of the following are classes of annelids? (Select all that apply)
Which of the following are classes of annelids? (Select all that apply)
- Class Echinodermata
- Class Arthropoda
- Class Clitelatta (correct)
- Class Polychaeta (correct)
What percentage of annelid species does Class Polychaeta represent?
What percentage of annelid species does Class Polychaeta represent?
60%
Earthworms are classified under Class Polychaeta.
Earthworms are classified under Class Polychaeta.
False (B)
What is an example of a Polychaeta?
What is an example of a Polychaeta?
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The term 'peripodium' refers to a '______ foot' structure found in annelids.
The term 'peripodium' refers to a '______ foot' structure found in annelids.
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What are setae?
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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