Biology · ANIMAL KINGDOM

Hemichordates were previously classified as a subphylum under Chordata. Why were they reclassified under Non-Chordata, and what structure was mistakenly identified as a true notochord?

They lack a true notochord and possess a rudimentary stomochord in the collar region
They have an open circulatory system; Stomochord in the proboscis
They have a dorsal double solid nerve cord; Proboscis gland in the collar
They are exclusively freshwater organisms with a cartilaginous vertebral axis

Correct answer · Option 1

They lack a true notochord and possess a rudimentary stomochord in the collar region

Explanation

Hemichordates have a rudimentary structure in the collar region called stomochord, which is structurally distinct from a true notochord. Hence, they are placed as a separate phylum under Non-Chordata.

Hemichordates were previously classified as a subphylum under Chordata. Why were they reclassified under Non-Chordata, and what structure was mistakenly identified as a true notochord?

Correct answer · Option 1

Explanation

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Hemichordates were previously classified as a subphylum under Chordata. Why were they reclassified under Non-Chordata, and what structure was mistakenly identified as a true notochord?

Correct answer · Option 1

Explanation

Related questions

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उपयोगी लिंक

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