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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References

SHOWING 1-10 OF 10 REFERENCES
Morphology of Luolishania longicruris (Lower Cambrian, Chengjiang Lagerstätte, SW China) and the phylogenetic relationships within lobopodians.
TLDR
A new cladistic analysis suggests that fossil lobopodians are paraphyletic or even polyphyletic and L. longicruris may be an important representative of the stem lineage leading to arthropods. Expand
An armoured Cambrian lobopodian from China with arthropod-like appendages
TLDR
D. cactiformis is described as an ‘armoured’ lobopodian from the Chengjiang fossil Lagerstätte (Cambrian Stage 3), Yunnan, southwestern China, remarkable for possessing robust and probably sclerotized appendages, with what appear to be articulated elements. Expand
The Burgess Shale Anomalocaridid Hurdia and Its Significance for Early Euarthropod Evolution
TLDR
Hurdia possesses a general body architecture similar to those of Anomalocaris and Laggania, but differs from those anomalocaridids by possessing a prominent anterior carapace structure, and provides insight into the origins of important arthropod features, such as the head shield and respiratory exites. Expand
The nature and significance of the appendages of Opabinia from the Middle Cambrian Burgess Shale
TLDR
A new hypothesis for the origin of the arthropod biramous limb from an exopod like that in Opabinia is presented, which involves an endite-bearing phyllopodous limb as an intermediate stage. Expand
Probability, parsimony, and Popper
ture (Archie, 1989a, 1989b; Faith, 1990; Faith and Cranston, 1991) compare the mini? mum length of the tree found for the orig? inal character data to the length of the tree achieved forExpand
ESTIMATING CHARACTER WEIGHTS DURING TREE SEARCH
Abstract— A new method for weighting characters according to their homoplasy is proposed; the method is non‐iterative and does not require independent estimations of weights. It is based on searchingExpand
TNT, a free program for cladistic analysis
  • Cladistics 24,
  • 2008
Lobopodian phylogeny reanalysed
TLDR
An cladistic analysis resolved Diania as sister-taxon to arthropods and tentatively inferred that arthropodization may have preceded arthrodization (sclerotization of body elements) inArthropod evolution, which concur with the reasoning behind this inference, but rests on a phylogenetic placement that does not reproduce. Expand
Phylogeny of Diania challenged
  • Nature
  • 2011