Trilobozoans are unique to the Ediacaran biota; they appeared suddenly 560 million-years-ago in the fossil record without any precursors.
None of the Cambrian animal phyla is represented in the Ediacaran fossil record.
The fossil record speaks clearly and cries out loud: the history of life on Earth is a history of saltations.
But what about tracks of the moving animal? There are indeed some fossils from the White Sea.
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.”