Phylogenetic position of Diania challenged

@article{Mounce2011PhylogeneticPO,
  title={Phylogenetic position of Diania challenged},
  author={R. Mounce and Matthew Albion Wills},
  journal={Nature},
  year={2011},
  volume={476},
  pages={E1-E1}
}
Arising from J. Liu et al. 470, 526–530 (2011)10.1038/nature09704; Liu et al. replyLiu et al. describe a new and remarkable fossil, Diania cactiformis. This animal apparently combined the soft trunk of lobopodians (a group including the extant velvet worms in addition to many Palaeozoic genera) with the jointed limbs that typify arthropods. They go on to promote Diania as the immediate sister group to the arthropods, and conjecture that sclerotized and jointed limbs may therefore have evolved… Expand
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The morphology and phylogenetic position of the Cambrian lobopodian Diania cactiformis
TLDR
New observations on D. cactiformis are made using newly collected material, rejecting the evidence for sclerotized, segmented and articulated appendages; instead the appendages compare more closely to lobopods. Expand
Origins and early evolution of arthropods
TLDR
Phylogenomics reconstructs an arthropod tree in which a monophyletic Arthropoda splits into Pycnogonida +-Euchelicerata and Myriapoda + Pancrustacea, and a sister group relationship between Onychophora and Arthropod is endorsed by transcriptomics and microRNAs. Expand
The early history of the metazoa—a paleontologist’s viewpoint
TLDR
In the aggregate, modern data from molecular biology, palaeontology, and comparative embryology/morphology, having been revitalized by the introduction of new microscopy techniques, imply that the hypothesized planktotrophic gastrae-like common ancestor is the least likely of the diverse suggestions on the origins of the Metazoa. Expand
Cambrian lobopodians: A review of recent progress in our understanding of their morphology and evolution
TLDR
The legs of Aysheaia pedunculata have a strong attachment with the body, like those of lobopodians in the Chengjiang Fauna, anditudinal wrinkles on the body of Xenusion auerswalde are regarded here as putative muscles. Expand
A Tube-Dwelling Early Cambrian Lobopodian
TLDR
Comprehensive phylogenetic analyses using parsimony, Bayesian inference, and maximum likelihood all support Facivermis as a luolishaniid in a derived position within the onychophoran stem group rather than as a basal panarthropod, and conclude that Faciver Mis provides a rare early Cambrian example of secondary loss to accommodate a highly specialized tube-dwelling lifestyle. Expand
Decay of velvet worms (Onychophora), and bias in the fossil record of lobopodians
TLDR
It is hypothesized that stemward slippage is unlikely to be a significant factor among the taphonomic biases that have affected organisms where decay-resistant features of the anatomy are rich in phylogenetically informative characters, and organisms which possess decay- resistant body parts but have informative characters concentrated in decay-prone tissues will be just as liable to bias as those that lack decay- resisting body parts. Expand
Worm-lobopodian assemblages from the Early Cambrian Chengjiang biota: Insight into the “pre-arthropodan ecology”?
TLDR
It is hypothesized that during a time interval preceding Cambrian Stage 2, scalidophoran worms and lobopodians were the prevalent ecdysozoan component of early animal communities, and the notion of a possible “pre-arthropodan ecology” is introduced. Expand
The disparity of priapulid, archaeopriapulid and palaeoscolecid worms in the light of new data
TLDR
This study samples at the species level and includes numerous fossils and some extant forms described in the last fifteen years of Priapulids, among the first groups used to test hypotheses concerning the morphological disparity of Cambrian fossils relative to the extant fauna. Expand
Pandora’s Pithos
TLDR
An epidemic of Cambrian Explosion (CE) virus, a “phylagen” that was able to infect and reconfigure metazoan morphogenetic fields and genomic kernels, caused the geologically simultaneous appearance of numerous animal phyla at the base of the Cambrian. Expand
Deconstructing the long‐standing a priori assumption that serial homology generally involves ancestral similarity followed by anatomical divergence
TLDR
It is shown that: (a) there are almost never cases of true ancestral similarity; (b) in evolution, such structures— for example, vertebra—and/or their subparts—for example, “transverse processes”—many times display trends toward less similarity while in many others display trends towards more similarity, that is, one cannot say that there is a clear, overall trend to anisomerism. Expand
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Phylogeny of Diania challenged
  • Nature
  • 2011
PAUP* [Phylogenetic Analysis Using Parsimony (and Other Methods)]