Hemichordates are

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chordates with notochord but without vertebral column

worm-like marine animals with organ-system level of organisation

metamerically segmented and bilaterally symmetrical animals

radially symmetrical animals with a bilaterally symmetrical larval stage

answer is D.

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Detailed Solution

Hemichordates are worm-like marine animals with organ-system level of organisation. They possess a stomochord, a structure similar to the notochord. Formerly they were included as a subphylum in the phylum Chordata. At present, Hemichordata is treated as a non-chordate minor phylum.

Protochordates (Urochordata and Cephalochordata) are the chordates with notochord but without vertebral column.

Annelids and arthropods are metamerically segmented bilaterally symmetrical animals.

Echinoderms are radially symmetrical animals with a bilaterally symmetrical larval stage.

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