Acanthophractida is "an order of marine protozoans in the subclass Acantharia; skeleton includes a latticework shell and skeletal rods". They have a latticework shell, which can be spherical or ovoid and fused with the skeletal rods. The shell is concentric with the central capsule. "The body is usually covered with a single or double gelatinous sheath through which the skeletal rods emerge".