4.1 Article

A reexamination of Yuknessia from the Cambrian of British Columbia and Utah

期刊

JOURNAL OF PALEONTOLOGY
卷 89, 期 1, 页码 82-95

出版社

PALEONTOLOGICAL SOC INC
DOI: 10.1017/jpa.2014.7

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资金

  1. National Science Foundation [EAR 1250756]
  2. College of Arts and Sciences and Graduate School at Eastern Michigan University
  3. Natural Sciences and Engineering Research Council of Canada [341944]
  4. Virginia Tech Nanoscale Characterization and Fabrication Laboratory
  5. Mizzou Electron Microscopy Core
  6. NSF [EAR 1250800]
  7. Royal Ontario Museum Burgess Shale project [57]
  8. Directorate For Geosciences [1250756] Funding Source: National Science Foundation
  9. Division Of Earth Sciences [1250800] Funding Source: National Science Foundation

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To investigate the phylogenetic affinity of Yuknessia simplex Walcott, 1919, scanning electron microscopy was applied to the Burgess Shale (Cambrian Series 3, Stage 5) type material and to new material from the Trilobite Beds (Yoho National Park) and specimens from the Cambrian of Utah. On the basis of fine-scale details observed using this approach, including banding structure interpreted as fusellae, Yuknessia Walcott, 1919 is transferred from the algae, where it resided for nearly a century, to the extant taxon Pterobranchia (Phylum Hemichordata). Considered as such, Yuknessia specimens from the Trilobite Beds and Spence Formation (Utah) are amongst the oldest known colonial pterobranchs. Two morphs regarded herein as two different species are recognized from the Trilobite Beds based on tubarium morphology. Yuknessia simplex has slender erect tubes whereas Yuknessia stephenensis n. sp., which is also known in Utah, has more robust erect tubes. The two paratypes of Y. simplex designated by Walcott (1919) are formally removed from Yuknessia and are reinterpreted respectively as an indeterminate alga and Dalyia racemata Walcott, 1919, a putative red alga.

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