Yuknessia

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Yuknessia
Temporal range: Chengjiang-Burgess Shale
Scientific classification
Kingdom:
Animalia
Phylum:
Hemichordata
Class:
Pterobranchia
Genus:
†Yuknessia

Walcott, 1919
Species
  • †Y. simplexWalcott, 1919 (type)
  • †Y. stephenensisLoDuca 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. [2] [4] [5]

References

  1. 1 2 Briggs, D. E. G.; Erwin, D. H.; Collier, F. J. (1995), Fossils of the Burgess Shale, Washington: Smithsonian Institution Press, ISBN   1-56098-659-X, OCLC   231793738
  2. 1 2 3 Steven T. LoDuca; Jean-Bernard Caron; James D. Schiffbauer; Shuhai Xiao & Anthony Kramer (2015). "A reexamination of Yuknessia from the Cambrian of British Columbia and Utah". Journal of Paleontology. 89 (1): 82–95. Bibcode:2015JPal...89...82L. doi: 10.1017/jpa.2014.7 . S2CID   129248278.
  3. ↑ Caron, Jean-Bernard; Jackson, Donald A. (October 2006). "Taphonomy of the Greater Phyllopod Bed community, Burgess Shale". PALAIOS. 21 (5): 451–65. Bibcode:2006Palai..21..451C. doi:10.2110/palo.2003.P05-070R. JSTOR   20173022. S2CID   53646959.
  4. ↑ Michael Steiner & 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. ↑ Maletz, Jörg; Steiner, Michael (2015). "Graptolite (Hemichordata, Pterobranchia) preservation and identification in the Cambrian Series 3". Palaeontology. 58 (6): 1073–1107. Bibcode:2015Palgy..58.1073M. doi: 10.1111/pala.12200 . S2CID   129341868.
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