Fossil specimen of Yuknessia

Yuknessia is a type of green alga from the Cambrian Period.


Yuknessia superficially resembled modern kelp in appearance. Its long fronds were attached to a central body covered in small, conical plates.[1]


Yuknessia is generally regarded to be a type of green alga of the division Chlorophyta. There is one known species, Y. simplex.[2]


Yuknessia was described in 1919 by Charles Doolittle Walcott from the Burgess Shale in British Columbia, Canada.[3] Several other specimens have been found at the Burgess Shale,[4] and other specimens have been found in the Maotianshan and Wheeler Shales of China and Utah, respectively.


  1. Briggs, D.E.G.; Erwin, D.H.; Collier, F.J. (1995), Fossils of the Burgess Shale, Washington: Smithsonian Inst Press, ISBN 156098659X, OCLC 231793738
  3. Guiry, M.D. & Guiry, G.M. 2014. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 06 February 2014.
  4. Caron, J. -B.; Jackson, D. A. (October 2006). "Taphonomy of the Greater Phyllopod Bed community, Burgess Shale". PALAIOS 21 (5): 451–465. doi:10.2110/palo.2003.P05-070R.