It has sand-filled tubes, although these may not have been sand-filled in life. It has a shield-like shape, with one end different from the other, and bilateral symmetry, and although it has been suggested that it possesses glide reflection symmetry, such suggestions are based upon a taphonomic effect deforming some specimens.
It has tubes filled with sand, though these may not have been filled in the original state. It possesses a shield-like form with one end different from the other and showing bilateral symmetry. Despite suggestions of glide reflection symmetry due to taphonomic effects deforming some specimens, this remains an interpretation based on specimen alterations.