Which of the following statement is incorrect about phylum Hemichordata?

• A

  It was earlier considered a subphylum under phylum Chordata.

• B

  It has a rudimentary structure called stomochord in the trunk.

• C

  This phylum consists of a small group of worm-like marine animals.

• D

  They are bilaterally symmetrical, triploblastic and coelomate animals.