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2007, G. M. Narbonne, J. G. Gehling, P. Vickers-Rich, “Chapter 3: The Misty Coasts of Newsoundland”, in Mikhail A. Fedonkin, James G. Gehling, Kathleen Grey, Guy M. Narbonne, Patricia Vickers-Rich, editors, The Rise of Animals, Johns Hopkins University Press, page 59:
Previous comparisons of rangeomorphs with cnidarians or ctenophores now seem unlikely. The fact that both sides of the rangeomorph structure are essentially identical, is not consistent with the rangeomorph frondlet "representing the bases of an array of open tubes that housed polyps or other filter feeding organisms."
Although the possibility that they were passive “mattresses” holding symbiotic algae is plausible for the shallow-marine specimens of Australia, the oldest Ediacarans are the branching, frond-shaped rangeomorphs from Mistaken Point, Newfoundland, which lived without light in deep water (Narbonne, 1998).
2020, Michael J. Benton, editor, Cowen's History of Life, 6th edition, Wiley Blackwell, page 53:
Rangeomorphs became extinct at the end of the Ediacaran, at or before 541 Ma,[…].
Usage notes
Despite their showing few characteristics of animals, it remains an open question whether to classify rangeomorphs within kingdomAnimalia or Plantae, if not an entirely different group of protists that independently evolved multicellularity. They are in any case presumed to have gone extinct without leaving modern descendants.
Rangeomorph on Wikipedia.Wikipedia 