Synchrotron X-ray tomographic microscopy of fossil embryos

  title={Synchrotron X-ray tomographic microscopy of fossil embryos},
  author={Philip C. J. Donoghue and Stefan Bengtson and Xi-Ping Dong and Neil J. Gostling and Therese Huldtgren and John A. Cunningham and Chongyu Yin and Zhao Yue and Fan Peng and Marco Stampanoni},
Fossilized embryos from the late Neoproterozoic and earliest Phanerozoic have caused much excitement because they preserve the earliest stages of embryology of animals that represent the initial diversification of metazoans. However, the potential of this material has not been fully realized because of reliance on traditional, non-destructive methods that allow analysis of exposed surfaces only, and destructive methods that preserve only a single two-dimensional view of the interior of the… 

Non-destructive analysis of in situ ammonoid jaws by synchrotron radiation X-ray micro-computed tomography

We introduce high-resolution synchrotron radiation X-ray tomography for nondestructive, three-dimensional reconstruction of the jaw apparatus preserved within the body chamber of the Late Cretaceous

Virtual taphonomy using synchrotron tomographic microscopy reveals cryptic features and internal structure of modern and fossil plants

The ability to gain search images in both 2D and 3D for potential fossils gives paleobotanists a tool—virtual taphonomy—to improve the understanding of plant evolution and paleobiogeography.

Developmental biology of the early Cambrian cnidarian Olivooides

The development of Olivooides from embryonic and adult stages is elucidated and interpreted and the affinities of the olivooids among medusozoan cnidarians are considered; the phylogenetic analysis supports their classification as total‐group Coronata, within crown‐Scyphozoa.

Scanning Electron Microscopy and Synchrotron Radiation X-Ray Tomographic Microscopy of 330 Million Year Old Charcoalified Seed Fern Fertile Organs

Low vacuum scanning electron microscopy on uncoated specimens with backscatter detector and synchrotron radiation X-ray tomographic microscopy utilizing the Materials Science and TOMCAT beamlines at the Swiss Light Source of the Paul Scherrer Institut improve upon traditional cellulose acetate peel sectioning and contribute to understanding of the former diversity and evolution of ovules, seeds, and pollen organs in the seed ferns.

The internal structure of Early Cambrian fossil embryo Olivooides revealed in the light of Synchrotron X-ray Tomographic Microscopy

Using the technique of Synchrotron X-ray Tomographic Microscopy, the 3D internal structure of Olivooides and Punctatus is reconstructed and indicates that this structure is a result of adaptive evolution to a lifestyle of fast-attaching after hatching, probably with the function of mucilage secretion.

Phase-contrast X-ray microtomography links Cretaceous seeds with Gnetales and Bennettitales

Over the past 25 years the discovery and study of Cretaceous plant mesofossils has yielded diverse and exquisitely preserved fossil flowers that have revolutionized our knowledge of early

Complex embryos displaying bilaterian characters from Precambrian Doushantuo phosphate deposits, Weng'an, Guizhou, China

These embryos provide further evidence for the presence of bilaterian animals in the Doushantuo biota and indicate that the last common ancestor of the bilaterians lived much earlier than is usually thought.



Three-dimensional preservation of algae and animal embryos in a Neoproterozoic phosphorite

Embryos preserved in early cleavage stages indicate that the divergence of lineages leading to bilaterians may have occurred well before their macroscopic traces or body fossils appear in the geological record.

Experimental taphonomy shows the feasibility of fossil embryos.

Experimental taphonomy of marine embryos and larvae similar in size and inferred cleavage mode to presumptive fossil embryos is reported to provide a predictive basis for interpreting the fossil record to unravel the evolution of ontogeny in the origin of metazoans.

Precambrian animal life: probable developmental and adult cnidarian forms from Southwest China.

The new observations reported in this paper indicate the existence of a diverse and already differentiated cnidarian fauna, long before the Cambrian evolutionary event.

Embryonic and post‐embryonic development of the Early Cambrian cnidarian Olivooides

The prevalence of lecithotrophic direct developers in the Neoproterozoic and Cambrian, unless reflecting a preservational bias, casts some doubts on evolutionary models that assume larval planktotrophy to be primitive among metazoans.

Fossilized embryos are widespread but the record is temporally and taxonomically biased

Alternative explanations for the low taxonomic diversity of embryos recovered thus far are explored, concluding that the preponderance of Markuelia embryos is due to its precocious development of cuticle at an embryonic stage, predisposing it to preservation through action as a substrate on which microbially mediated precipitation of authigenic calcium phosphate may occur.

Fossil embryos from the Middle and Late Cambrian period of Hunan, south China

Findings from Hunan, south China, corroborate, rather than contradict, the predictions of comparative embryology, providing direct historical support for the view that the life-history strategies of living taxa are representative of their stem lineages.

Eumetazoan fossils in terminal proterozoic phosphorites?

  • S. XiaoX. YuanA. Knoll
  • Geography, Environmental Science
    Proceedings of the National Academy of Sciences of the United States of America
  • 2000
Evidence for Doushantuo eumetazoans is provided by millimeter-scale tubes that display tabulation and apical budding characteristic of some Cnidaria, especially the extinct tabulates.

The anatomy, affinity, and phylogenetic significance of Markuelia

The available evidence supports stem‐Scalidophora affinity, leading to the conclusion that scalidophorans, cyclonerualians, and ecdysozoans are primitive direct developers, and the likelihood that scidalophoran are primitively metameric.

Response to Comment on "Small Bilaterian Fossils from 40 to 55 Million Years Before the Cambrian"

It is counterfactual to deny preservation of structural morphology at the cellular level in this kind of material.

The ‘Orsten’ window — a three-dimensionally preserved Upper Cambrian meiofauna and its contribution to our understanding of the evolution of Arthropoda

The presence of these “pre-euarthropods,” which lack, or partly lack, characteristic features developed later in the arthropod evolutionary lineage, and the recent record of phosphatocopine Crustacea in the earliest Palaeozoic are regarded as a support for the view that the ancestry of Arthropoda lies much further back, possibly well in the late Pre-Cambrian.