Yuknessia
| Yuknessia Temporal range: Chengjiang–Burgess Shale | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Hemichordata |
| Class: | Pterobranchia |
| Genus: | Yuknessia Walcott, 1919 |
| Species | |
| |
Yuknessia is an early pterobranch, known from the Burgess shale,[1] the Chengjiang and the Wheeler shale.[2] Long, unbranched fronds emerge from a central holdfast-like body covered in small conical plates.[1] 23 specimens of Yuknessia are known from the Greater Phyllopod bed, where they comprise < 0.1% of the community.[3] The genus contains two species: the type species Y. simplex and Y. stephenensis[2] It was originally interpreted as a green alga, and has since been reinterpreted it as a colonial pterobranch.[4][2]
External links
- "Yuknessia simplex". Burgess Shale Fossil Gallery. Virtual Museum of Canada. 2011.
References
- ↑ 1.0 1.1 Briggs, D.E.G.; Erwin, D.H.; Collier, F.J. (1995), Fossils of the Burgess Shale, Washington: Smithsonian Inst Press, ISBN 156098659X, OCLC 231793738
- ↑ 2.0 2.1 2.2 Steven T. LoDuca, Jean-Bernard Caron, James D. Schiffbauer, Shuhai Xiao and Anthony Kramer (2015). "A reexamination of Yuknessia from the Cambrian of British Columbia and Utah". Journal of Paleontology 89 (1): 82–95. doi:10.1017/jpa.2014.7.
- ↑ Caron, Jean-Bernard; Jackson, Donald A. (October 2006). "Taphonomy of the Greater Phyllopod Bed community, Burgess Shale". PALAIOS 21 (5): 451–65. doi:10.2110/palo.2003.P05-070R. JSTOR 20173022.
- ↑ Michael Steiner and Jörg Maletz (2012). "Cambrian graptolites (Pterobranchia) and the origin of colonial organization in metazoans" (PDF). TERRA NOSTRA – Schriften der GeoUnion Alfred-Wegener-Stiftung. Centenary Meeting of the Paläontologische Gesellschaft. Programme, Abstracts, and Field Guides. 2012/3: 173–174.