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Questions and Answers
Which of the following animals belong to the phylum Echinodermata?
Which of the following animals belong to the phylum Echinodermata?
- Acorn worm
- Star fish (correct)
- Balanoglossus
- Saccoglossus
All hemichordates are known for their excellent regeneration capabilities.
All hemichordates are known for their excellent regeneration capabilities.
False (B)
What are the three main body parts of hemichordates?
What are the three main body parts of hemichordates?
proboscis, collar, trunk
Echinoderms are primarily found in the _____ environment.
Echinoderms are primarily found in the _____ environment.
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Match the following examples with their respective phylum:
Match the following examples with their respective phylum:
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Study Notes
Phylum Echinodermata
- Echinoderms are characterized by the presence of calcareous spines on their bodies.
- Found exclusively in marine environments.
- Exhibit radial symmetry as adults, but are bilaterally symmetrical in their larval stage.
- Possess a triploblastic and eucoelomate body structure.
- Locomotion is facilitated by tube feet, which are also used for prey capture. Some echinoderms are sedentary.
- Their skeleton consists of calcareous spines and/or ossicles (plates).
- They possess exceptional regenerative capabilities.
- Reproduction is typically unisexual.
- Examples include starfish, sea urchins, brittle stars, sea cucumbers, etc.
Phylum Hemichordata
- Hemichordates have a tripartite body plan, divided into a proboscis, collar, and trunk.
- A notochord is present only in the proboscis region, thus justifying the name 'hemichordate'.
- Also known as 'acorn worms'.
- Marine animals that reside in burrows within sand.
- Possess one or more pharyngeal gill slits.
- Reproduction is often unisexual, but some species are hermaphroditic.
- Examples include Balanoglossus and Saccoglossus.
Hemichordates and Evolution
- Balanoglossus is considered a crucial evolutionary link between non-chordates and chordates due to traits shared by both groups.
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