Assertion: Hemichordata was earlier considered as subphylum under phylum chordata. But now it is pla
Channel: Doubtnut
Date: 2020-01-26

Assertion: Hemichordata was earlier considered as subphylum under phylum chordata. But now it is placed as a separate phylum under non-chordata. Reason: Hemichordates have open type of circulatory system and indirect development.