There is a strange fact that shows that any interpretation of these trace fossils has to be taken with a grain of salt.
The body fossils are generally positioned at the focal points of the fan-shaped scratch marks.
A former teacher of mine was the late Adolf Seilacher, who was a leading authority on trace fossils and who for obvious reasons preferred to be called “Dolf.”
One of the few features that are uncontroversial is the body size: The fossils measure usually 1-5 cm in length.
Ikaria wariootia is just another problematic Ediacaran fossil that could be anything from inorganic artifact to protozoan to cnidarian and yes, maybe a bilaterian worm.