Topic
Eoandromeda
About: Eoandromeda is a research topic. Over the lifetime, 8 publications have been published within this topic receiving 241 citations.
Papers
TL;DR: This article reported the preservation of the eight-armed Ediacara fossil Eoandromeda octobrachiata as carbonaceous compressions in the Doushantuo black shale of south China and as casts and molds in the Rawnsley Quartzite in South Australia.
Abstract: We report the preservation of the eight-armed Ediacara fossil Eoandromeda octobrachiata as carbonaceous compressions in the Doushantuo black shale of south China and as casts and molds in the Rawnsley Quartzite in South Australia. The contrasting preservational styles in two taphonomic windows indicate that E. octobrachiata may have had a relatively recalcitrant organic integument, which rules out its close comparison with giant agglutinated foraminifers such as xenophyophores. Its octaradial symmetry and dextrally spiraling arms suggest that it may be a diploblastic-grade animal sharing some features with cnidarians and ctenophores, although its phylogenetic affinity remains open. It is the first and only unambiguously identified Ediacaran macrofossil that occurs in two drastically different taphonomic windows, thus bridging the conventional biological and taxonomic gaps between the Ediacara and Miaohe biotas, which collectively record the earliest known macroscopic and complex life.
130 citations
TL;DR: The Ediacaran fossil Eoandromeda octobrachiata had a high conical body with eight arms in helicospiral arrangement along the flanks, and was interpreted as an early stem‐group ctenophore, characterized by the synapomorphies ctenes, comb rows, and octoradial symmetry but lacking crown‐group synapomorphicies.
Abstract: The Ediacaran fossil Eoandromeda octobrachiata had a high conical body with eight arms in helicospiral arrangement along the flanks. The arms carried transverse bands proposed to be homologous to ctenophore ctenes (comb plates). Eoandromeda is interpreted as an early stem-group ctenophore, characterized by the synapomorphies ctenes, comb rows, and octoradial symmetry but lacking crown-group synapomorphies such as tentacles, statoliths, polar fields, and biradial symmetry. It probably had a pelagic mode of life. The early appearance in the fossil record of octoradial ctenophores is most consistent with the Planulozoa hypothesis (Ctenophora is the sister group of Cnidaria + Bilateria) of metazoan phylogeny.
74 citations
TL;DR: In this article, a disc-shaped macrofossil, Eoandromeda octobrachiata, characterized by eight spiral arms that were probably housed within an outer membrane was found.
Abstract: Shales of the Ediacaran Doushantuo Formation of South China contain a new disc-shaped macrofossil, Eoandromeda octobrachiata, characterized by eight spiral arms that were probably housed within an outer membrane. Although the presence of eight radiating structures entails a resemblance to cnidarian octocorals as well as to ctenophores, direct homologies with these extant groups are unlikely. Instead we bring attention to the helicospiral morphology of newly reported embryos from the Doushantuo Formation, suggesting that the long-sought adults of the Ediacaran embryonic metazoans have finally been found.
66 citations
TL;DR: Xiao et al. as discussed by the authors argue that Ediacaran fossils were not in paleosols because some Australian beds contain the problematic fossil Eoandromeda also known from Chinese beds they consider marine.
Abstract: [Xiao et al. (2013)][1] argue that Ediacaran fossils were not in paleosols because some Australian beds contain the problematic fossil Eoandromeda also known from Chinese beds they consider marine. They offer no alternative explanations. My preferred alternative is that Eoandromeda was a terrestrial
22 citations
1 Jan 2009
TL;DR: The discovery of these paleontological data has not only further perfected the biostratigraphical sequence of the Ediacaran Doushantuo Formation in China as discussed by the authors, but also provided the evidence for the subdivision and correlation of the EDiacaran System in the world.
Abstract: This paper describes in brief new advances in the study of biostratigraphy of the Ediacaran(Sinian) Doushantuo Formation in South China:(1) the well-preserved eight-armed,diated,Ediacara body fossil -Eoandromeda octobrachiata-was found in the black shale within the upper part of the Doushantuo Formation in Wenghui,Jiangkou County,Guizhou Province,South China.This discovery confirms for the first time the existence of the Ediacara body fossil in the Miaohe biota of the Doushantuo Formation and thus provides important evidence for the correlation between the fossiliferous positions and typical Ediacaran strata in Australia;(2) Tianzhushania ornata was first found in the 2nd Member of the Doushantuo Formation.This further confirms the presence of a lower acritarch assemblage dominated by Tianzhushania and other diverse acanthomorphic morphs in the 2nd Member and provides new evidence for correlation of these contemporaneous strata;(3) the upper acanthomorphic acritarch assemblage dominated by Tanarium was found in the 3rd Member of the Doushantuo Formation,which is associated with tubular microfossils with a circular and square cross-sections,and whose distribution is quite stable and widespread.The discovery of these paleontological data has not only further perfected the biostratigraphical sequence of the Ediacaran Doushantuo Formation in China but also provided the paleontological evidence for the subdivision and correlation of the Ediacaran System in the world.
9 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2014 | 1 |
| 2012 | 1 |
| 2011 | 2 |
| 2010 | 2 |
| 2009 | 1 |
| 2008 | 1 |