Question:
Sponges that contain calcareous spicules and live in shallow marine waters are included under the class
Sponges that contain calcareous spicules and live in shallow marine waters are included under the class
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Calcarea = calcium carbonate spicules + shallow marine habitat.
Updated On: Jul 18, 2026
- Calcarea
- Demospongiae
- Hexactinellida
- Scyphozoa
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The Correct Option is A
Solution and Explanation
Step 1: Understanding Porifera classification.
Sponges belong to phylum Porifera and are classified based on the type of spicules and skeletal composition. Major classes include Calcarea, Demospongiae, and Hexactinellida.
Step 2: Characteristics of Calcarea.
Class Calcarea consists of sponges having calcareous (calcium carbonate) spicules. These sponges are usually small and found in shallow marine environments.
Step 3: Habitat features.
Calcarea sponges prefer shallow waters because calcareous spicules are stable in such environments. They are mostly marine and attached to substrates.
Step 4: Evaluation of other classes.
Demospongiae have silica or spongin fibers, Hexactinellida have glass-like silica spicules, and Scyphozoa is a class of cnidarians, not sponges.
Step 5: Structural significance.
Calcareous spicules provide structural support and are characteristic features used for classification of Calcarea.
Step 6: Final conclusion.
Thus, sponges with calcareous spicules in shallow marine waters belong to class Calcarea.
Sponges belong to phylum Porifera and are classified based on the type of spicules and skeletal composition. Major classes include Calcarea, Demospongiae, and Hexactinellida.
Step 2: Characteristics of Calcarea.
Class Calcarea consists of sponges having calcareous (calcium carbonate) spicules. These sponges are usually small and found in shallow marine environments.
Step 3: Habitat features.
Calcarea sponges prefer shallow waters because calcareous spicules are stable in such environments. They are mostly marine and attached to substrates.
Step 4: Evaluation of other classes.
Demospongiae have silica or spongin fibers, Hexactinellida have glass-like silica spicules, and Scyphozoa is a class of cnidarians, not sponges.
Step 5: Structural significance.
Calcareous spicules provide structural support and are characteristic features used for classification of Calcarea.
Step 6: Final conclusion.
Thus, sponges with calcareous spicules in shallow marine waters belong to class Calcarea.
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