A new metazoan from the Vendian of the White Sea, Russia, with possible affinities to the ascidians

@article{Fedonkin2012ANM,
  title={A new metazoan from the Vendian of the White Sea, Russia, with possible affinities to the ascidians},
  author={M. Fedonkin and P. Vickers-Rich and B. Swalla and P. Trusler and M. Hall},
  journal={Paleontological Journal},
  year={2012},
  volume={46},
  pages={1-11}
}
Two specimens recovered from late Neoproterozoic shallow marine sediments of northern Russia may be the oldest known ascidians. Dated at around 555 Ma, these, together with the younger Ausia from the Nama Group in southwestern Africa, are probably relatives of these invertebrate chordates, which have a deep time origin predicted by molecular studies. 

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References

SHOWING 1-10 OF 45 REFERENCES
LONG EXPECTED SPONGES FROM THE NEOPROTEROZOIC EDIACARA FAUNA OF SOUTH AUSTRALIA
ABsTRAC--New fossils from the Neoproterozoic Ediacara fauna of South Australia are interpreted as the oldest known hexactinellid sponges. They occur within the Ediacara Member of the RawnsleyExpand
Age of Neoproterozoic bilatarian body and trace fossils, White Sea, Russia: implications for metazoan evolution.
TLDR
A uranium-lead zircon age for a volcanic ash interstratified with fossil-bearing, shallow marine siliciclastic rocks in the Zimnie Gory section of the White Sea region indicates that a diverse assemblage of body and trace fossils occurred before 555.3 +/- 0.3 million years ago, making co-occurring trace fossils the oldest that are reliably dated. Expand
New and extraordinary Early Cambrian sponge spicule assemblage from China
The fossil record of siliceous sponges, compared with that of other skeleton- secreting Metazoa, is poorly known, based as it is on disarticulated spicules and sporadically preserved body fossils.Expand
Ventogyrus, a possible siphonophore-like trilobozoan coelenterate from the Vendian Sequence (late Neoproterozoic), northern Russia
Abstract Complex internal anatomy is documented for the first time in a Neoproterozoic soft-bodied invertebrate. New data suggests that Ventogyrus, originally described as a sessile, boat-shaped formExpand
Palaeobotryllus from the Upper Cambrian of Nevada — a probable ascidian
Phosphatic microfossils etched from Upper Cambrian (Trempealeauan Stage) Limestones of the Whipple Cave Formation, Nevada, and other contemporaneous formations in western North America, are colonies,Expand
Monophyletic origins of the metazoa: an evolutionary link with fungi
TLDR
A phylogenetic framework inferred from comparisons of small subunit ribosomal RNA sequences describes the evolutionary origin and early branching patterns of the kingdom Animalia and shows the animal lineage is monophyletic and includes choanoflagellates. Expand
An Early Cambrian tunicate from China
TLDR
A probable tunicate Cheungkongella ancestralis from the Chengjiang fauna is reported that resembles the extant ascidian tunicate genus Styela whose morphology could be useful in understanding the origin of the vertebrates. Expand
The Rise and Fall of the Ediacaran Biota
The Proterozoic and early Phanerozoic was a time punctuated by a series of significant events in Earth history. Glaciations of global scale wracked the planet, interfingered with dramatic changes inExpand
Details of the evolutionary history from invertebrates to vertebrates, as deduced from the sequences of 18S rDNA.
  • H. Wada, N. Satoh
  • Biology, Medicine
  • Proceedings of the National Academy of Sciences of the United States of America
  • 1994
TLDR
Phylogenetic comparisons of the sequences of 18S rDNA suggest the monophyly of the deuterostomes, with the exception of the chaetognaths, and support the hypothesis that chordates evolved from free-living ancestors. Expand
The first tunicate from the Early Cambrian of South China
TLDR
Based on new, more complete “Cheungkongella” specimens that show branching tentacles, this form may be a lophophorate, and in any case is not a tunicate. Expand
...
1
2
3
4
5
...