Evidence map›Paper›PMID 31924764›Full record

ArticleNature communications2020

Discovery of bilaterian-type through-guts in cloudinomorphs from the terminal Ediacaran Period.

James D Schiffbauer, Tara Selly, Sarah M Jacquet, Rachel A Merz, Lyle L Nelson, Michael A Strange, Yaoping Cai, Emily F Smith

Abstract read
In one paragraph

Article in Nature communications, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers.

0numbers the graph read from it
0cells of the map it votes in
18citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

18 citing papers in PubMed.

  1. Polychaete annelids from the earliest Cambrian Period.Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  2. An Increase in Animal Diversity was Facilitated by Ecologically-Driven Brain Complexity Throughout the Cambrian.BioEssays : news and reviews in molecular, cellular and developmental biology · 2026
    Review
  3. Article
  4. Article
  5. Article
  6. Royal Society open science · 2024
    Article
  7. Article
  8. Review
  9. EdiacaraniScience · 2022
    Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Ancient life and moving fluids.Biological reviews of the Cambridge Philosophical Society · 2021
    Review
  15. Article
  16. Article
  17. Article
  18. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors.

James D SchiffbauerDepartment of Geological Sciences, University of Missouri, Columbia, MO, 65211, USA. schiffbauerj@missouri.edu.ORCID http://orcid.org/0000-0003-4726-0355
Tara SellyDepartment of Geological Sciences, University of Missouri, Columbia, MO, 65211, USA. sellyt@missouri.edu.ORCID http://orcid.org/0000-0002-7525-0042
Sarah M JacquetDepartment of Geological Sciences, University of Missouri, Columbia, MO, 65211, USA.ORCID http://orcid.org/0000-0001-6673-4929
Rachel A MerzBiology Department, Swarthmore College, Swarthmore, PA, 19081, USA.
Lyle L NelsonDepartment of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD, 21218, USA.
Michael A StrangeDepartment of Geoscience, University of Nevada, Las Vegas, Las Vegas, NV, 89154, USA.
Yaoping CaiShaanxi Key Laboratory of Early Life and Environment, State Key Laboratory of Continental Dynamics, and Department of Geology, Northwest University, Xi'an, 710069, China.
Emily F SmithDepartment of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD, 21218, USA.ORCID http://orcid.org/0000-0001-9260-9355

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The fossil record of the terminal Ediacaran Period is typified by the iconic index fossil Cloudina and its relatives. These tube-dwellers are presumed to be primitive metazoans, but resolving their phylogenetic identity has remained a point of contention. The root of the problem is a lack of diagnostic features; that is, phylogenetic interpretations have largely centered on the only available source of information-their external tubes. Here, using tomographic analyses of fossils from the Wood Canyon Formation (Nevada, USA), we report evidence of recognizable soft tissues within their external tubes. Although alternative interpretations are plausible, these internal cylindrical structures may be most appropriately interpreted as digestive tracts, which would be, to date, the earliest-known occurrence of such features in the fossil record. If this interpretation is correct, their nature as one-way through-guts not only provides evidence for establishing these fossils as definitive bilaterians but also has implications for the long-debated phylogenetic position of the broader cloudinomorphs.

Indexed as

FossilsAbdomenAnimalsAnnelidaBiological EvolutionCnidariaGeologic SedimentsNevadaPhylogeny

Identifiers

PMID31924764
PMCPMC6954273

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.