Tornaria

A tornaria is the planktonic larva of some species of Hemichordata such as the acorn worms.

[1][2] It is very similar in appearance to the bipinnaria larvae of starfishes, with convoluted bands of cilia running around the body.

[1] It is an oval shaped, transparent larva.

It has an apical plate, which is a thickened region provided by a tuft of cilia and a pair of eye spots.

The larva has a complete alimentary canal.