Yuknessia

Yuknessia
Temporal range: Chengjiang–Burgess Shale
Scientific classification
Kingdom: Animalia
Phylum: Hemichordata
Class: Pterobranchia
Genus: Yuknessia
Walcott, 1919
Species
  • Y. simplex Walcott, 1919 (type)
  • Y. stephenensis LoDuca et al., 2015

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][5]

External links

References

  1. 1 2 Briggs, D.E.G.; Erwin, D.H.; Collier, F.J. (1995), Fossils of the Burgess Shale, Washington: Smithsonian Inst Press, ISBN 1-56098-659-X, OCLC 231793738
  2. 1 2 3 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.
  3. 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.
  4. 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.
  5. . doi:10.1111/pala12200 (inactive 2015-10-11). Missing or empty |title= (help)
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