Hemichordates are not considered true chordat | vedclass

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(D) Hemichordates were previously considered a sub-phylum under Phylum Chordata because they possess a structure called the stomochord in the collar r

Vedclass · Accepted Answer

Both statements $(B)$ and $(C)$ are correct.

Vedclass · Answer

(D) Hemichordates were previously considered a sub-phylum under Phylum Chordata because they possess a structure called the stomochord in the collar region,which was earlier mistaken for a notochord.However,the stomochord is not a true notochord as it is not mesodermal in origin and does not extend throughout the body length.Furthermore,true chordates are characterized by the presence of a dorsal hollow nerve cord,which is absent in hemichordates (they possess a dorsal and ventral nerve cord).Therefore,hemichordates are now placed in a separate phylum,and both statements $(B)$ and $(C)$ are valid reasons for their exclusion from Phylum Chordata.

Hemichordates are not considered true chordates because:

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