Question:
The closest invertebrate relatives of chordates belong to the phylum:
The closest invertebrate relatives of chordates belong to the phylum:
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Chordates and echinoderms are both deuterostomes—making echinoderms their closest invertebrate relatives.
Updated On: May 17, 2025
- Mollusca
- Echinodermata
- Coelenterata
- Arthropoda
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The Correct Option is B
Solution and Explanation
Chordates and echinoderms both belong to the group Deuterostomia, characterized by:
- Radial, indeterminate cleavage
- Development of the anus from the blastopore
- Similarities in embryonic development
This shared ancestry makes Echinodermata (e.g., starfish, sea urchins) the closest invertebrate relatives of chordates.
Other phyla:
- Mollusca and Arthropoda are protostomes.
- Coelenterata (Cnidaria) are more primitive and not closely related developmentally.
- Radial, indeterminate cleavage
- Development of the anus from the blastopore
- Similarities in embryonic development
This shared ancestry makes Echinodermata (e.g., starfish, sea urchins) the closest invertebrate relatives of chordates.
Other phyla:
- Mollusca and Arthropoda are protostomes.
- Coelenterata (Cnidaria) are more primitive and not closely related developmentally.
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