Question

Hemichordata was earlier placed under
phylum chordata, but now it is
grouped under non-chordatan list
any
three features that support the
change in grouping​

Answer 1

Explanation:

hemichordates have the notochord in their proboscis region only.

They have open circulatory system.

Hemichordates are comparatively low-organized animals. They remain strange in terms of their relationship. It is doubtful whether the gill slits, the notochord and the nerve cord of these animals are homologous to those of other chordates. Therefore, the claim of hemichordata to ‘chordate status’ is questionable. This is why modern zoologists have recommended the placement of hemichordata as an independent phylum under non-chordata.