rangeomorph

translingual Rangea +‎ -o- +‎ -morph

rangeomorph (plural rangeomorphs)

1. Any organism of the clade Rangeomorpha, Precambrian (Ediacaran) sessile organisms resembling ferns, possibly descended from sponges and among the oldest known complex lifeforms.
   • 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."

   • 2013, Donald R. Prothero, Bringing Fossils to Life: An Introduction to Paleobiology, Columbia University Press, page 260:

     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, […] .

Despite their showing few characteristics of animals, it remains an open question whether to classify rangeomorphs within kingdom Animalia 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.

• †Rangea (type genus of Rangeomorpha)
• †Rangeomorpha

• Rangeomorph on Wikipedia.Wikipedia
• Rangea on Wikipedia.Wikipedia

• monographer, nomographer