HEMICHORDATA-CLASSIFICATION

Hemichordata includes about 80 species include Enteropneusta and Pterobranchia . 

Enteropneusta

Solitary ,free-swimming or burrowing animals commonly called the "acorn" or "tongug worms".

Body elongated,vermiform.

Proboscis cylindrical and tapering.

Collar without ciliated arms(lophophore).

Alimentary canal straight.

Mouth and anus at opposite ends.

Filter feeding.

Several pairs of u-shaped gill-slita.

Sexes separate.

Gonads numerous,sac-like.

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