Atornaria 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. The diameter of the body is about 3 mm. 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. The ciliary band stretches throughout the anterior and posterior region, and also the postoral region.
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