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A new 'great-appendage' arthropod from the Lower Cambrian of China and homology of chelicerate chelicerae and raptorial antero-ventral appendages
A new form from the Lower Cambrian Maotianshan Shale of southern China is regarded as the possible latest offshoot, whereas the other ‘great appendages’ arthropods with similar short grasping limbs were derivatives of the stem lineage of the crown-group Chelicerata.
Functional morphology, ontogeny and evolution of mantis shrimp‐like predators in the Cambrian
The arrangement of the elbow joint supports the view that the great appendage evolved into the chelicera of Chelicerata sensu stricto, as similar joints are found in various ingroup taxa such as Xiphosura, Opiliones or Palpigradi.
An epipodite-bearing crown-group crustacean from the Lower Cambrian
- Xi-guang Zhang, D. Siveter, D. Waloszek, A. Maas
- Geography, Environmental ScienceNature
- 4 October 2007
The limb morphology and other details of this new species are markedly similar to those of living cephalocarids, branchiopods and copepods and it is assigned to the Eucrustacea, thus representing the first undoubted crown-group crustacean from the early Cambrian.
Larval development and morphogenesis of the sea spider Pycnogonum litorale (Ström, 1762) and the tagmosis of the body of Pantopoda.
A Larval Sea Spider (Arthropoda: Pycnogonida) from the Upper Cambrian ‘orsten’ of Sweden, and the Phylogenetic Position of Pycnogonids
The pre‐cheliceral limbs in this fossil support traditional morphological studies in which the chelicera represent the second head appendage corresponding to the crustacean ‘second antennae’, and contradict recent data based on homeobox genes implying that theChelicerae are the first (a1) head appendages homologous with crustaceans first antennae.
Early Cambrian arthropods—new insights into arthropod head and structural evolution
Morphology, Ontogeny and Phylogeny of the Phosphatocopina (Crustacea) from the Upper Cambrian Orsten of Sweden
The 'Orsten': more than a Cambrian Konservat-Lagerstätte yielding exceptional preservation
Cambrian Derivatives of the Early Arthropod Stem Lineage, Pentastomids, Tardigrades and Lobopodians An ‘Orsten’ Perspective
‘Orsten’-type preservation is the phosphatisation of cuticular surfaces without any further deformation and has yielded completely three-dimensional fossils, mainly arthropods at scale of 100 μm—2 mm, implying that the ancestry of Arthropoda lies even further back well in the Pre-Cambrian.
Fossilized embryos are widespread but the record is temporally and taxonomically biased
- P. Donoghue, Artem V. Kouchinsky, J. Repetski
- Environmental Science, GeographyEvolution & development
- 1 March 2006
Alternative explanations for the low taxonomic diversity of embryos recovered thus far are explored, concluding that the preponderance of Markuelia embryos is due to its precocious development of cuticle at an embryonic stage, predisposing it to preservation through action as a substrate on which microbially mediated precipitation of authigenic calcium phosphate may occur.