Eoandromeda and the origin of Ctenophora

  title={Eoandromeda and the origin of Ctenophora},
  author={Feng Tang and Stefan Bengtson and Yue Wang and Xun-lian Wang and Chongyu Yin},
  journal={Evolution \& Development},
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… 

Eoandromeda Octobrachiata and the Evolution of Early Animals

  • T. Feng
  • Geography, Environmental Science
  • 2012
The recent paleontological study is consistent with a recently published molecular phylogenomic hypothesis and advances the research of metazoan origin and early evolution, and helps solve the puzzle of early animal evolution by using the new fossil evidence.

Ctenophores: an evolutionary-developmental perspective.

A vanished history of skeletonization in Cambrian comb jellies

This clade reveals a cryptic history and sheds new light on the early evolution of this basal animal phylum and is resolved as a monophyletic group (Scleroctenophora new class) within the ctenophores.

A late-surviving stem-ctenophore from the Late Devonian of Miguasha (Canada)

The phylogenetic analyses suggest that the new taxon Daihuoides jakobvintheri gen. et sp.

Lifestyle of the Octoradiate Eoandromeda in the Ediacaran

Abstract. The octoradiate Eoandromeda Tang et al. from the Ediacaran of South China and South Australia is poorly understood and there are different interpretations of its morphology and


Morphological, evolutionary, internal and external phylogenetic aspects of the four phyla, including Porifera, Cnidaria, Placozoa and Ctenophora, are highlighted and discussed.


Experimental decay of the epibenthic actinian Metridium senile provides a semi-quantitative and predictive framework which can be applied to the interpretation of putative polypoid cnidarian organisms and provides the means to evaluate the taxonomic validity of the long-standing assumption that many enigmatic soft-bodied Ediacaran and lower Cambrian taxa are of actinian grade.

Critical appraisal of tubular putative eumetazoans from the Ediacaran Weng'an Doushantuo biota

New insights are presented into the anatomy, original composition and phylogenetic affinities of these taxa based on data from synchrotron radiation X-ray tomographic microscopy, ptychographic nanotomography, scanning electron microscopy and electron probe microanalysis.



Octoradiate Spiral Organisms in the Ediacaran of South China

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

The first fossil ctenophore from the Lower Devonian of West Germany

Of the 21 or so generally accepted animal phyla, only one, the Ctenophora, has no fossil record1. The Phylum Ctenophora or comb jellies, are typically globular, swimming marine organisms, widely

Lower Cambrian Vendobionts from China and Early Diploblast Evolution

A frondlike fossil, Stromatoveris, is described from the Lower Cambrian Chengjiang Lagerstätte (Yunnan, China) that is strikingly similar to Ediacaran vendobionts and has important implications for the early evolution of this phylum and related diploblasts, some of which independently evolved a frondose habit.

Raman spectra of a Lower Cambrian ctenophore embryo from southwestern Shaanxi, China

The oldest ctenophore and the only embryonic comb jelly known from the fossil record, this exceptionally well preserved specimen provides important clues about the early evolution of the phylum Ctenophora and of metazoans in general.

Possible ctenophoran affinities of the precambrian “sea‐pen” Rangea

  • J. Dzik
  • Environmental Science
    Journal of morphology
  • 2002
The Namibian Kuibis Quartzite fossils of Rangea are preserved three‐dimensionally owing to incomplete collapse of the soft tissues under the load of instantaneously deposited sand, and it is proposed that the irregularly distributed dark spots on the fusiform units of the petaloid of Thaumaptilon represent a kind of macrocilia and that the units are homologous with the ctenophoran comb organs.

Middle Cambrian ctenophores from the Stephen Formation, British Columbia, Canada

The Ctenophora are a marine phylum of gelatinous swimmers and crawlers, with a minimal fossilization potential, but they probably evolved very early in the metazoan radiations, perhaps from an animal with an anterio-posterior axis and a ciliated surface.

A new fossil ctenophore discovered by X-rays

An additional specimen discovered by X-rays reveals even more detail than the first, including preservation of the delicate comb rows and possible gonads, in ctenophores of the Lower Devonian Hunsrück Slate of West Germany.

Eight-armed Ediacara fossil preserved in contrasting taphonomic windows from China and Australia

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

The phylogenetic position of the comb jellies (Ctenophora) and the importance of taxonomic sampling

The reconstructed topology is considered to represent the current best hypothesis of the interrelationships of these old lineages and morphological features supporting alternative hypotheses are discussed in the light of this result.