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Named By: Charles Doolittle Walcott in 1919
Time Period: Chengjiang-Burgess Shale
Location: Canada - Burgess Shale. China, Chengjiang. USA, Utah
Size: Up to 3 centimetres across
Diet: unavailable
Fossil(s): At least 23 individuals
Classification: | Animalia | Hemichordata | Pterobranchia |

Yuknessia is an early pterobranch, known from the Burgess shale, the Chengjiang and the Wheeler shale. Long, unbranched fronds emerge from a central holdfast-like body covered in small conical plates. 23 specimens of Yuknessia are known from the Greater Phyllopod bed, where they comprise < 0.1% of the community. The genus contains two species: the type species Y. simplex and Y. stephenensis It was originally interpreted as a green alga, and has since been reinterpreted it as a colonial pterobranch.

Read more about Yuknessia at Wikipedia
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