The DOI matches its Crossref record; 43 of the 44 references it cites were found in a registry or an index; none of the 29 sources its claims cite is checked for support yet.
Precambrian animal diversity: Putative phosphatized embryos from the Doushantuo Formation of China
Open accessAbstract
Putative fossil embryos and larvae from the Precambrian phosphorite rocks of the Doushantuo Formation in Southwest China have been examined in thin section by bright field and polarized light microscopy. Although we cannot completely exclude a nonbiological or nonmetazoan origin, we identified what appear to be modern cnidarian developmental stages, including both anthozoan planula larvae and hydrozoan embryos. Most importantly, the sections contain a variety of small (≤200 μm) structures that greatly resemble gastrula stage embryos of modern bilaterian forms.
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TL;DR
Thin-section microscopy of phosphorites from the Doushantuo Formation revealed putative fossil embryos and larvae resembling modern cnidarian and bilaterian gastrulae, including small ≤200 μm forms. The authors argue these may extend cnidarian and bilaterian evolutionary history deeper into the Precambrian, while acknowledging that a nonbiological or nonmetazoan origin cannot be completely excluded.
Key findings
- The sections contain what appear to be modern cnidarian developmental stages, including anthozoan planula larvae and hydrozoan embryos, plus small (≤200 μm) structures resembling gastrula-stage embryos of modern bilaterian forms.
- Bilaterian-like gastrulae are typically 150–200 μm in diameter; in three deuterostome embryo-like specimens, the archenteron diameter was 27 ± 3% of the average external diameter, and cnidarian-like embryo wall thicknesses were consistently similar.
- About 2,000 thin sections were examined and over 4,000 digital images of embryos and larvae were recorded; each reported morphotype was encountered multiple times.
- The Doushantuo Formation could be as old as 580 Ma, pending direct measurement within 570 ± 20 Ma, and is likely to precede the lowest strata with which bilaterian remains have so far been associated.
Methods
- Samples were collected from the Wusi and Baidoushan quarries of the Weng’an phosphate mine; thin sections were 30–50 μm thick and examined by transmitted light microscopy at ×100 or ×200 magnification, with selected samples viewed in cross-polarized light with a gypsum plate.
- About 2,000 sections were examined, over 4,000 digital images of embryos and larvae were recorded, and morphometric measurements were taken from photographic representations and converted to μm by reference to size standards.
Limitations
- Stated: the authors cannot completely exclude a nonbiological or nonmetazoan origin, and it remains formally possible that only some aspects of the fossils are biogenic—perhaps not even metazoan—while other features are nonbiogenic.
- Stated: this is an initial analysis; the actual diversity of bilaterian forms can be established only by examination of later developmental stages, if they can be recovered, and taxonomic assignments are tentative; more extensive morphometric measurements are forthcoming.
- Evident: the study is from one particular location/deposit and relies on morphological resemblance to modern embryos, with no direct molecular or adult-form evidence reported.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“considering the complexity of the mineralization process, the dimensional consistency of each type is fairly remarkable.”
Strength:plain· not yet calibratedn = 3Tests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Fig. 2A shows a form strikingly similar to an early anthozoan planula.”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In several of the images, individual contiguous cells appear to have been reconstituted as individual crystals, seen in polarized light in different colors, because their axes are noncoincident (Figs. 2F, 3D, and 4F).”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The structures shown in Fig. 3 A–G resemble embryos of the echinoderm-hemichordate clade of the deuterostomes, as illustrated by the sea urchin example in Fig. 3H.”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In Fig. 2D, for example, the orientations of the crystals in what look to be the endodermal and ectodermal cell layers of the embryo are in several places the same, as indicated by the similar colors (arrows).”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Although oncoids occur in these sections (although quite rarely, compared with fossil embryos), their concentric, often laminar structures appear quite different from those of the putative fossil embryos when viewed in polarized light.”
Load-bearingStrength:hedged· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“For example, the fraction of the average external diameter constituted by the diameter of the archenteron in the three deuterostome embryo-like specimens is 27 ± 3%”
Strength:plain· not yet calibratedn = 3Tests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The main feature of the polarized and bright-field image pairs in Figs. 2 and 3 is that the morphology of the putative fossil embryos looks the same by either display.”
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Fig. 3 shows a remarkable series of what appear to be fossil embryos that display specific characteristics of modern bilaterian gastrula-stage embryos, specifically those of many phyla of modern marine invertebrates.”
Load-bearingStrength:hedged· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesThe paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“Throughout most of the polarized light images, large contiguous patches of cells constituting a given epithelial layer generally display the same crystal orientation.”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
- It may state two separate claims as one. 9
- Probably not a substantial claim. 3
- The quote only partly states this claim. 1
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“However, there is so far no evidence of embryos of bilaterian nature in the Doushantuo phosphorites that are more than 250 μm in diameter, or that have forms which support the possibility of direct development”
Load-bearingStrength:hedged· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Various forms that we saw cannot immediately be identified by similarity to modern models, and an example is shown in Fig. 4D; its affinities are problematic.”
Strength:plain· not yet calibratedSingle caseTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“and the thickness of both the apparent endodermal inner layer, and the average thickness of outer wall in all of the cniderian-like embryos, were always the same.”
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“These coated grains are dissimilar to one another in size, crystal structure, number of laminations, and lamination thickness.”
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIt may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“The structures appear to be bounded by single cell-thick walls that enclose blastocoelar spaces of familiar dimension; the bilaterian-like forms display archenterons; and the cnidarian-like forms other typical endodermal morphologies.”
Load-bearingStrength:hedged· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The large blastocoel and the characteristic deuterostome archenterons are particularly clear in Fig. 3 A, C, and G.”
Load-bearingStrength:boosted· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
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In the paper
“Note first that these are all rather small forms, typically 150–200 μm in diameter, similar to many echinoderm and hemichordate embryos, and to molluscan, polychaete, and a good many other lophotrochozoan embryos.”
Strength:plain· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIt may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“As we summarize in Discussion, the results of the polarized and bright-field microscopy are consistent with the argument that the objects described in Figs. 2 and 3 are indeed fossilized embryos, which originally were composed of epithelial layers of cells surrounding internal cellular structures that arose by invagination.”
Load-bearingStrength:hedged· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
- Rests on an assumption: Constant morphology and constant dimension are outputs of genetically controlled developmental systems and are a powerful index of biological origin.
None of the sources cited for this claim have been checked yet.
In the paper
“arguments based on regulatory evolution lead to the proposition that microfaunal bilaterian stem groups must have evolved through several stages of regulatory complexity during Precambrian time (17, 18).”
What the sources say
- Not checked yetcites [17] Davidson E H, Peterson K J, Cameron R A. Science. 1995;270:1319–1325. doi: 10.1126/science.270.5240.1319. [DOI] [PubMed] [Google Scholar] source
- Not checked yetcites [18] Peterson K J, Davidson E H. Proc Natl Acad Sci USA. 2000;97:4487–4492. doi: 10.1073/pnas.97.9.4487. [DOI] [PMC free article] [PubMed] [Google Scholar] source
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In Fig. 3 A and B, we can see that the original structure from which the fossil formed was soft, for its external wall is deformed by a hard grain against which it still lies (arrow).”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“If the Precambrian embryonic organisms of bilaterian form discussed here developed into organisms that we could recognize as similar to adult bilaterian forms, they almost certainly did so indirectly, using planktotrophic larval forms.”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesThe quote only partly states this claim.
- Rests on an assumption: Morphological resemblance between fossil structures and modern developmental stages is a reliable indicator of biological affinity.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The claim made in this paper is that organisms that produced embryos of bilaterian affinity, as well as clearly differentiated cnidarian forms, may have existed some millions of years earlier than indicated by any previous paleontological evidence.”
Load-bearingStrength:hedged· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
- The authors state this as an assumption: The fossil embryos in Fig. 3 are real (authentic fossils).
- Rests on an assumption: Constant morphology and constant dimension are outputs of genetically controlled developmental systems and are a powerful index of biological origin.
None of the sources cited for this claim have been checked yet.
In the paper
“Many lines of evidence show that for deuterostomes and lophotrochozoans maximal indirect development is primitive, and direct development is derived (36–38).”
What the sources say
- Not checked yetcites [36] Peterson K J, Cameron R A, Davidson E H. BioEssays. 1997;19:623–631. doi: 10.1002/bies.950190713. [DOI] [PubMed] [Google Scholar] source
- Not checked yetcites [37] Peterson K J, Cameron R A, Davidson E H. Dev Biol. 2000;219:1–17. doi: 10.1006/dbio.1999.9475. [DOI] [PubMed] [Google Scholar] source
- Not checked yetcites [38] Nielsen C. Biol Rev Camb Philos Soc. 1998;73:125–155. [Google Scholar]
Load-bearingStrength:boosted· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
The authors state this as an assumption.
The fossil embryos in Fig. 3 are real (authentic fossils).
“In any case, assuming that they are indeed real, the bilaterian nature of the fossil embryos in Fig. 3 is hard to doubt.”
The paper relies on this without support.
Constant morphology and constant dimension are outputs of genetically controlled developmental systems and are a powerful index of biological origin.
“Constant morphology and constant dimension are the outputs of genetically controlled developmental systems and are thus a powerful index of biological origin.”
The paper relies on this without support.
Morphological resemblance between fossil structures and modern developmental stages is a reliable indicator of biological affinity.
“The comparisons with modern forms in Fig. 3 are intended only to show that the morphological characters of the fossil gastrulae are paralleled in detail by those of modern bilaterian gastrulae.”
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
The source backs part of the claim, not all of it — or backs it for a different population, condition or comparison.
In the citing paper
“and indeed there is clear evidence for the prevalence of sponges and cnidarians from both the Doushantuo and Ediacaran assemblages (Gehling and Rigby, 1996;Brasier et al., 1997;Chen et al., 2000;Xiao et al., 2000;Chen et al., 2002).”
From The last common bilaterian ancestor (2002) · cites this paper as Chen et al., 2000
Experimental — accuracy not yet measuredIn the citing paper
“A number of studies have shown that the Doushantuo phosphorites have a high potential for preservation of very fine biological detail, including cellular and even subcellular structures (e.g., Xiao et al., 1998;Li et al., 1998;Chen et al., 2000).”
From Precambrian Animal Life: Probable Developmental and Adult Cnidarian Forms from Southwest China (2002) · cites this paper as Chen et al., 2000
In the citing paper
“Among these are putative gastrulae, which appear to be marvelously preserved, single cell-thick structures the morphology and dimensions of which bear remarkable resemblance to some modern bilaterian gastrulae.”
From Precambrian Animal Life: Probable Developmental and Adult Cnidarian Forms from Southwest China (2002) · cites this paper as Chen et al., 2000
In the citing paper
“The only fossil evidence that would appear to relate to earlier bilaterian forms consists of still enigmatic microfossils of gastrula-stage embryos from the Doushantuo formation of Southwest China (Chen et al., 2000).”
From Precambrian Animal Life: Probable Developmental and Adult Cnidarian Forms from Southwest China (2002) · cites this paper as Chen et al., 2000
In the citing paper
“Other classes of gastrula-like microfossil reported by Chen et al. (2000) resemble the gastrular and planular forms of some modern cnidarians.”
From Precambrian Animal Life: Probable Developmental and Adult Cnidarian Forms from Southwest China (2002) · cites this paper as Chen et al., 2000
In the citing paper
“The age of these microfossils is likely to be between 570 and 580 mya, i.e., 25-35 my prior to the onset of the Cambrian (Fig. 1).”
From Precambrian Animal Life: Probable Developmental and Adult Cnidarian Forms from Southwest China (2002) · cites this paper as Chen et al., 2000
In the citing paper
“It might be noted that the embryos we describe here, like those of Chen et al. (2000) are not particularly small; they fall within the range of modern examples.”
From Precambrian Animal Life: Probable Developmental and Adult Cnidarian Forms from Southwest China (2002) · cites this paper as Chen et al. (2000)
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
Cnidarian-like embryo wall thicknesses are not always the same
MinorThe text says the inner-layer and average outer-wall thicknesses were always the same. Table 1 instead lists inner walls ranging from 6.7 to 9.0 μm and outer walls ranging from 9.0 to 18 μm.
“the thickness of both the apparent endodermal inner layer, and the average thickness of outer wall in all of the cniderian-like embryos, were always the same.”
“Fig. 2 A 234 × 333 13.4 9.0 * — 207 × 252 13.5 — — 234 × 234 13.5 9.0 * — 252 × 297 9.0 9.0 * — Fig. 2 C 140 × 140 13.4 6.7 — 126 × 142 13.4 8.0 — 135 × 144 13.5; 18 † 9.0 —”
Citations
Cites
Evidence for a clade of nematodes, arthropods and other moulting animals
Aguinaldo, A. M. A., Turbeville, J. M., Linford, L. S., Rivera, M. C., Garey, J. R., Raff, R. A., & Lake, J. A. (1997) · Nature · doi:10.1038/387489a0 · Cited by 1,609
Reproduction of Marine Invertebrates
(1979) · Elsevier eBooks · doi:10.1016/b978-0-12-282505-7.x5001-5 · Cited by 1,268
Three-dimensional preservation of algae and animal embryos in a Neoproterozoic phosphorite
Xiao, S., Zhang, Y., & Knoll, A. H. (1998) · Nature · doi:10.1038/35318 · Cited by 783
Biostratigraphic and Geochronologic Constraints on Early Animal Evolution
Grotzinger, J. P., Bowring, S. A., Saylor, B. Z., & Kaufman, A. J. (1995) · Science · doi:10.1126/science.270.5236.598 · Cited by 701
Embryology and Phylogeny in Annelids and Arthropods
(1973) · Elsevier eBooks · doi:10.1016/c2013-0-05626-5 · Cited by 535
Reproduction of marine invertebrates
Dales, R. P. (1974) · Nature · doi:10.1038/251556b0 · Cited by 531
Calibrating Rates of Early Cambrian Evolution
Bowring, S. A., Grotzinger, J. P., Isachsen, C. E., Knoll, A. H., Pelechaty, S. M., & Kolosov, P. (1993) · Science · doi:10.1126/science.11539488 · Cited by 524
The new animal phylogeny: Reliability and implications
Adoutte, A., Balavoine, G., Lartillot, N., Lespinet, O., Prud'homme, B., & de Rosa, R. (2000) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.97.9.4453 · Cited by 512
Molecular Evidence for Deep Precambrian Divergences Among Metazoan Phyla
Wray, G. A., Levinton, J. S., & Shapiro, L. H. (1996) · Science · doi:10.1126/science.274.5287.568 · Cited by 511
Wang, D. Y.-C., Kumar, S., & Hedges, S. B. (1999) · Proceedings of the Royal Society of London. Series B: Biological Sciences · doi:10.1098/rspb.1999.0617 · Cited by 493
Flagged first, then by citations
1 of the 44 references couldn’t be matched to a known paper.
Research works printed but not linked: 10
- J-Y Chen, G-Q Zhou The Cambrian Explosion and the Fossil Record (Bulletin of the National Museum of Natural Science), eds J-Y Chen, Y N Cheng, H V Iten (National Museum of Natural History, Taichung) 10, 11–105 (1997).
- S Bengtson, S Conway Morris, B J Cooper, P A Jell, B N Runnegar Mem Ass Australas Palaeontols 9, 1–364 (1990).
- M A Fedonkin Early Life on Earth: Nobel Symposium No. 84, ed S Bengtson (Columbia Univ. Press, New York), pp. 370–388 (1994).
- J G Gehling, G M Narbonne, S Jensen, M L Droser Geol Soc Am Abstr Prog 31, 362 (1999).
- Y Qian, M Chen, Y Chen Acta Paleont Sinica 18, 207–232 (1979).
- Y Xing, Q Ding, H Luo, T He, Y Wang Chin Acad Geol Sci 7, 1–262 (1984).
- Y Zhang, L Yin, S Xiao, A H Knoll Paleont Soc Mem 50, 1–52 (1998).
- G Shields Eclogae Geol Helv 92, 221–233 (1999).
- Z Zhao, Y Xing, G Ma, Y Chen Biostratigraphy of the Yangtze Gorge Area, (1) Sinian (Geological Publishing House, Beijing, 1985).
- J-P Chevalier Traité de Zoologie, ed P-P Grassé (Masson, Paris), pp. 403–764 (1987).
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Yamada, K., Ueno, Y., Yamada, K., Komiya, T., Han, J., Shu, D., Yoshida, N., & Maruyama, S. (2013) · Gondwana Research · doi:10.1016/j.gr.2013.02.006 · Cited by 14
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Yang, W., He, S., Wu, Z., Zhai, G., Chen, R., Ning, Z., Lai, H., Ren, J., & Xu, C. (2023) · Fuel · doi:10.1016/j.fuel.2023.129673 · Cited by 12
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Zhu, M., Zhang, J., Yang, A., Li, G., Zhao, F., Miao, L., Yin, Z., Miao, L., & Hu, C. (2022) · Springer geology · doi:10.1007/978-981-19-5666-9_5 · Cited by 9
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Geobiological Events in the Ediacaran Period
Xiao, S. (2008) · The Paleontological Society Papers · doi:10.1017/s1089332600001625 · Cited by 8
The evolution of cnidarian stinging cells supports a Precambrian radiation of animal predators
Sierra, N. C., & Gold, D. A. (2024) · Evolution & Development · doi:10.1111/ede.12469 · Cited by 7
Vertebrate Immune System Evolution and Comparative Primate Immunity
Brinkworth, J. F., & Thorn, M. (2013) · Springer eBooks · doi:10.1007/978-1-4614-7181-3_2 · Cited by 6
(2009) · doi:10.1093/acprof:oso/9780199549429.001.0001 · Cited by 7
The earliest fossil record of the animals and its significance
Budd, G. E. (2009) · Oxford University Press eBooks · doi:10.1093/acprof:oso/9780199549429.003.0001 · Cited by 6
Geobiology and the fossil record: eukaryotes, microbes, and their interactions
Bottjer, D. J. (2005) · Elsevier eBooks · doi:10.1016/b978-0-444-52019-7.50004-8 · Cited by 6
Zhang, Y., & Zhang, X. (2022) · Precambrian Research · doi:10.1016/j.precamres.2022.106645 · Cited by 5
Braun, A. (2004) · Gondwana Research · doi:10.1016/s1342-937x(05)71055-8 · Cited by 5
The rise of bilaterians: a reply
Xiao, S., Kowalewski, M., Shen, B., Dong, L., & Laflamme, M. (2009) · Historical Biology · doi:10.1080/08912960903471659 · Cited by 5
Stanevich, A. M., Пучков, В. Н., RAS, I. U., Kornilova, T. A., Сергеева, Н. Д., RAS, I. U., & Maksimova, E. N. (2018) · Geologicheskii vestnik · doi:10.31084/2619-0087/2018-3-1 · Cited by 4
Chung, C.-H., You, C., Schopf, J. W., Takahata, N., & Sano, Y. (2019) · Precambrian Research · doi:10.1016/j.precamres.2019.105564 · Cited by 4
Research Progress of Ediacaran (Sinian) Biostratigraphy in South China
Liu, P., Yin, C., & Tang, F. (2022) · Springer geology · doi:10.1007/978-981-19-5666-9_4 · Cited by 4
Chi, H., Xiao, Z., Chen, J., & Lu, Z. (2007) · Scanning · doi:10.1002/sca.20008 · Cited by 4
Self-citationPeel, A. (2009) · Oxford University Press eBooks · doi:10.1093/acprof:oso/9780199549429.003.0016 · Cited by 4
Gan, D., Dong, J., Yang, W., Liu, W., Gao, T., Wang, J., Bian, C., Xie, L., Li, Y., Liu, J., et al. (2025) · Marine and Petroleum Geology · doi:10.1016/j.marpetgeo.2025.107531 · Cited by 3
Mathur, V. K., Mishra, V. P., & Nath, S. (2009) · Journal of the Geological Society of India · doi:10.1007/s12594-009-0156-z · Cited by 3
16 Patterns of Diversification and Extinction
Etter, W. (2007) · Springer eBooks · doi:10.1007/978-3-540-33761-4_16 · Cited by 3
The Nano Membrane-Like Structure of the Precambrian Microfossils under Atomic Force Microscope (AFM)
Chi, H., Xiao, Z., & Xiao, X. X. (2007) · Diffusion and defect data, solid state data. Part B, Solid state phenomena/Solid state phenomena · doi:10.4028/www.scientific.net/ssp.121-123.739 · Cited by 3
Preservation and fluorescence of the microfossils from Neoproterozoic Doushantuo formation
Chi, H., Feng, M., Xiao, Z., & Lu, Z. (2007) · Microscopy Research and Technique · doi:10.1002/jemt.20547 · Cited by 3
The origins and evolution of the Ecdysozoa
Telford, M. J., Bourlat, S. J., Economou, A. D., Papillon, D., & Rota‐Stabelli, O. (2009) · Oxford University Press eBooks · doi:10.1093/acprof:oso/9780199549429.003.0008 · Cited by 4
Origins of metazoan body plans: the larval revolution
Raff, R. A. (2009) · Oxford University Press eBooks · doi:10.1093/acprof:oso/9780199549429.003.0005 · Cited by 3
Shostak, S. (2015) · Cell & Developmental Biology · doi:10.4172/2168-9296.1000155 · Cited by 3
NANOTEXTURES OF VENDIAN AND ALB-CENOMANIAN PHOSPHATES OF THE NEARDNISTRIA
Шехунова, С. Б., Stadnichenko, S. M., Paliy, V. M., & Пермяков, В. В. (2016) · Collection of Scientific Works of the Institute of Geological Sciences of the NAS of Ukraine · doi:10.30836/igs.2522-9753.2016.144875 · Cited by 3
Валентиновна, Н. Н. (2024) · ARCTIC AND SUBARCTIC NATURAL RESOURCES · doi:10.31242/2618-9712-2024-29-4-527-534 · Cited by 2
The Apatite Crystal in Fossil Cells with Fluorescence
Chi, H., Feng, M., Chen, Y., Chun, D., Gu, L., Ma, J., & Lu, Z. (2008) · Crystal Growth & Design · doi:10.1021/cg7008539 · Cited by 2
Reassembling animal evolution: a four-dimensional puzzle
Telford, M. J., Timothy, D. J., & Littlewood, D. T. J. (2009) · Oxford University Press eBooks · doi:10.1093/acprof:oso/9780199549429.003.0018 · Cited by 2
Beldade, P., & Saenko, S. V. (2009) · Oxford University Press eBooks · doi:10.1093/acprof:oso/9780199549429.003.0017 · Cited by 2
��, Ï., ��, �., ��, �., ��, �., & ��, �. (2019) · SCIENTIA SINICA Terrae · doi:10.1360/sste-2019-0183 · Cited by 1
The Early Evolution of Animals: Insights from the 600 million-year-old Ediacaran Weng’an biota
Yin, Z. (2017) · Jahrbuch der Göttinger Akademie der Wissenschaften · doi:10.1515/jbg-2016-0016 · Cited by 2
Origin and Early Evolution of Animals
Peterson, K. J. (2014) · doi:10.1093/obo/9780199941728-0043 · Cited by 2
Self-citationOzernyuk, N. D. (2019) · Paleontological Journal · doi:10.1134/s0031030119110078 · Cited by 1
Eisenberg, R. S., & Bárbara (2000) · Cited by 1
Shostak, S. (2018) · The European Legacy · doi:10.1080/10848770.2018.1444714 · Cited by 1
Patterns of Diversification and Extinction
Etter, W. (2013) · Springer eBooks · doi:10.1007/978-3-642-27800-6_16-3 · Cited by 1
Duarte, J. C. (2022) · Elsevier eBooks · doi:10.1016/b978-0-323-90851-1.00010-8 · Cited by 1
Erwin, D. H. (2017) · History & Philosophy of the Life Sciences · doi:10.1007/s40656-017-0156-z · Cited by 1
About the origin of the "Cambrian Explosion" phenomenon and on the origin of animal types
Gorodilov, Y. N. (2019) · Proceedings of the Zoological Institute RAS · doi:10.31610/trudyzin/2019.supl.7.5 · Cited by 1
Eric Davidson’s career as a paleontologist
Bottjer, D. J. (2016) · Developmental Biology · doi:10.1016/j.ydbio.2016.01.026 · Cited by 1
Boore, J. L., & Fuerstenberg, S. I. (2009) · Oxford University Press eBooks · doi:10.1093/acprof:oso/9780199549429.003.0013 · Cited by 1
董, 熙. (2007) · Chinese Science Bulletin (Chinese Version) · doi:10.1360/csb2007-52-5-572 · Cited by 1
The animal in the genome: comparative genomics and evolution
Copley, R. R. (2009) · Oxford University Press eBooks · doi:10.1093/acprof:oso/9780199549429.003.0014 · Cited by 1
The sea urchin regulome in development
Ashby, M. (2007) · doi:10.7907/523t-5r49
Singh, V. K., Babu, R., Kumar, P., & Shukladagger, M. (2011) · Journal of Cell and Animal Biology · doi:10.5897/jcab.9000045
Krämer-Eis, A., Luca Ferretti, A., Schiffer, P. H., Heger, P., & Wiehe, T. (2016) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.1101/041806
Biota ediacárica, los primeros ecosistemas macroscópicos complejos de la tierra.
Díaz-Sibaja, R. (2015) · Ciencia Nicolaita · doi:10.35830/cn.vi66.196
Krämer-Eis, A., Luca Ferretti, A., Schiffer, P. H., Heger, P., & Wiehe, T. (2016)
Schram, F. R., & Koenemann, S. (2022) · doi:10.1093/oso/9780195365764.003.0003
Patterns of Diversification and Extinction
Etter, W. (2014) · Springer eBooks · doi:10.1007/978-3-642-39979-4_16 · Cited by 1
Lowe, C. J. (2009) · Oxford University Press eBooks · doi:10.1093/acprof:oso/9780199549429.003.0010
(2009) · Oxford University Press eBooks · doi:10.1093/acprof:oso/9780199549429.002.0004
(2009) · Oxford University Press eBooks · doi:10.1093/acprof:oso/9780199549429.002.0003
(2009) · Oxford University Press eBooks · doi:10.1093/acprof:oso/9780199549429.002.0007
(2009) · Oxford University Press eBooks · doi:10.1093/acprof:oso/9780199549429.002.0008
Wu, Q., Weppe, R., Lézin, C., Pan, Y., & Bailleul, A. M. (2024) · Scientific Reports · doi:10.1038/s41598-024-74301-y · Cited by 1
Developmental biology of the Ediacaran Megaclonophycus from the Weng’an Biota
Flett, K. E., Cracknell, K., Yamahuchi, J. S. C., Cunningham, J. A., Zhu, M., Yin, Z., & Donoghue, P. C. J. (2026) · Biology Letters · doi:10.1098/rsbl.2025.0592
Lapébie, P. (2010) · theses.fr (ABES) · doi:10.70675/29fb5e58z95e7z4353z8498zaa306e8a2449
Metadata
- Authors
- Chen, J.-Y., Oliveri, P., Li, C.-W., Zhou, G.-Q., Gao, F., Hagadorn, J. W., Peterson, K. J., & Davidson, E. H.
- Affiliations
- Nanjing Institute of Geology and Paleontology, Nanjing 210008, China; Divisions of Biology and Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125; and Department of Life Sciences, National Tsing Hua University, Hsinchu 300, Taiwan, China
- California Institute of Technology (US)
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2000-04-25
- Volume
- 97
- Issue
- 9
- Pages
- 4457-4462
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC18256
- OpenAlex
- W2165010994
- Semantic Scholar
- 5a119f690dd07be08df8dda9f1c40d3fe5b44191
- Cited by
- 187
- References
- 44
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 3 · 2023: 2 · 2022: 7 · 2021: 1 · 2020: 2 · 2019: 7 · 2018: 3 · 2017: 4 · 2016: 7 · 2015: 7 · 2014: 6 · 2013: 8 · 2012: 5
- FWCI
- 9.01
- Type
- journal article
- Language
- en
- Open access
- green
- europepmc.org
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- CaltechAUTHORS (California Institute of Technology) (submittedVersion)
- UCL Discovery (University College London) (submittedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
- Keywords
- Doushantuo Formation, phosphate rock, fossil embryos, early animal evolution, Precambrian fossils
- MeSH terms
- Animals, China, Cnidaria, Embryo, Nonmammalian, Biological Evolution, Fossils, Gastrula, Paleontology, Genetic Variation, Body Patterning
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