Named By: Charles Doolittle Walcott - 1919.
Classification: Animalia, Hemichordata, Pterobranchia.
Species: Y. simplex (type), Y. stephenensis.
Size: Up to 3 centimetres across.
Known locations: Canada - Burgess Shale. China, Chengjiang. USA, Utah.
Time period: Mid Cambrian.
Fossil representation: At least 23 individuals.
Yuknessia is a genus of algae that would have played a very important part in the shallow Mid Cambrian seas. Algae’s like Yuknessia would have created their own food supplies via the process of photosynthesis, and by doing so, extract carbon dioxide from the water while releasing oxygen, making survival conditions much more favourable for animals. The first fossils and type species of Yuknessia were found in the famous Burgess Shale of Canada.
- A re-examination of Yuknessia from the Cambrian of British Columbia and Utah. - Journal of Paleontology 89 (1): 82–95. - Steven T. LoDuca, Jean-Bernard Caron, James D. Schiffbauer, Shuhai Xiao & Anthony Kramer - 2015.