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Ancestral morphology of Ecdysozoa constrained by an early Cambrian stem group ecdysozoan [PDF]
BMC Evolutionary Biology, 2020 Background: Ecdysozoa are the moulting protostomes, including arthropods, tardigrades, and nematodes. Both the molecular and fossil records indicate that Ecdysozoa is an ancient group originating in the terminal Proterozoic, and exceptional fossil biotas
Richard J Howard +2 more
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The evolution of the Ecdysozoa [PDF]
Philosophical Transactions of the Royal Society B: Biological Sciences, 2008 Ecdysozoa is a clade composed of eight phyla: the arthropods, tardigrades and onychophorans that share segmentation and appendages and the nematodes, nematomorphs, priapulids, kinorhynchs and loriciferans, which are worms with an anterior proboscis or introvert.
Maximilian J Telford +2 more
exaly +3 more sources
Evolution & Development, 2004 There has been broad acceptance among evolutionary biologists of the Ecdysozoa hypothesis that, based principally on molecular phylogenetic studies of small and large subunit ribosomal RNA sequences, postulates a close relationship between molting taxa ...
Richard R Copley +2 more
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The clade Ecdysozoa, perplexities and questions [PDF]
Zoologischer Anzeiger, 2005 Abstract A relatively new clade, the Ecdysozoa [Aguinaldo et al., 1997. Nature 387, 489–493] was raised based on the 18S ribosomal DNA sequences that indicate a close relationship between the moulting phyla (Arthropoda, Tardigrada, Onychophora, Nematoda, Nematomorpha, Kinorhyncha, Lorificera and Priapula), from which the Annelida, with other phyla ...
Maria Grazia Binda +2 more
exaly +2 more sources
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2022
This chapter focuses on the large protostome clade Ecdysozoa. Unlike the Spiralia, Ecdysozoa can be defined by clear morphological synapomorphies, including their three-layered cuticle that is moulted, a process regulated by ecdysteroid hormones. Ecdysozoa contains eight phyla, which are commonly organized into three subclades: Scalidophora, Nematoida,
Richard C. Brusca +2 more
openaire +1 more source
This chapter focuses on the large protostome clade Ecdysozoa. Unlike the Spiralia, Ecdysozoa can be defined by clear morphological synapomorphies, including their three-layered cuticle that is moulted, a process regulated by ecdysteroid hormones. Ecdysozoa contains eight phyla, which are commonly organized into three subclades: Scalidophora, Nematoida,
Richard C. Brusca +2 more
openaire +1 more source
Ecdysozoa: The Relationship between Cycloneuralia and Panarthropoda
Zoologischer Anzeiger, 2001Abstract The hypothesis that molting protostomes such as nematodes and arthropods form a monophyletic group known as Ecdysozoa is directly opposed to Articulata, in which some segmented protostomes such as annelids and arthropods form a monophyletic taxon. Ultrastructural and cladistic studies have led to the widely accepted hypothesis that nematodes
James R Garey
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A tissue-specific marker of Ecdysozoa
Development Genes and Evolution, 2001Over the past few years, molecular studies of phylogeny have challenged the traditional view of evolutionary relationships among protostomian animal phyla. Based on analysis of 18S ribosomal RNA gene sequences, it has been suggested that some traditional groups, like the articulata and the pseudocoelomata, should be completely abandoned and that ...
A, Haase +3 more
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Ecdysozoa versus Articulata: clades, artifacts, prejudices
Journal of Zoological Systematics and Evolutionary Research, 2001 The claim that monophyly of the Ecdysozoa is caused by chance similarities in 18S rDNA sequences (Wagele et al., J. Zool. Syst. Evol. Res. 37, 211–223, 1999) is re-analysed from the cladistic point of view. It is shown that the molecular characters supporting the Ecdysozoa do not behave as ‘noisy’ in empirical studies that use the sensitivity analysis ...
exaly +2 more sources