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Molecular Timetrees Reveal a Cambrian Colonization of Land and a New Scenario for Ecdysozoan Evolution
A timescale of ecdysozoan evolution is presented based on multiple molecular data sets, the most complete set of fossil calibrations to date, and a thorough series of validation analyses, which converge on an Ediacaran origin of all major ecdy sozoan lineages. Expand
Anomalocaridid trunk limb homology revealed by a giant filter-feeder with paired flaps
Evidence shows that anomalocaridids represent a stage before the fusion of exite and endopod into the ‘Cambrian biramous limb’, confirming their basal placement in the euarthropod stem, rather than in the arthropod crown or with cycloneuralian worms. Expand
The Burgess Shale Anomalocaridid Hurdia and Its Significance for Early Euarthropod Evolution
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
Morphology of Anomalocaris canadensis from the Burgess Shale
It is shown that Anomalocaris canadensis is critical for understanding the functional morphology of the group as a whole and corroborating its arthropod affinities, and some of these structures have not been identified in other anomalocaridids. Expand
Morphology and systematics of the anomalocaridid arthropod Hurdia from the Middle Cambrian of British Columbia and Utah
In Cambrian fossil Lagerstätten like the Burgess Shale, exceptionally preserved arthropods constitute a large part of the taxonomic diversity, providing opportunities to study the early evolution ofExpand
Fossil calibrations for the arthropod Tree of Life
A series of rigorously vetted calibration fossils for arthropod evolutionary history, taking into account recently published guidelines for best practice in fossil calibration are presented, resulting in 80 fossil calibrations for 102 clades. Expand
The oral cone of Anomalocaris is not a classic ‘‘peytoia’’
It is shown that Anomalocaris has a different oral cone, with only three large plates and a variable number of smaller and medium plates, which suggests that suction, rather than biting, was used for food ingestion, and that anomalies in general employed a range of different scavenging and predatory feeding strategies. Expand
Sophisticated digestive systems in early arthropods.
Exceptionally well-preserved complex digestive organs in early arthropods from the early Cambrian of China and Greenland are described with functional similarities to certain modern crustaceans and trace these structures through the early evolutionary lineage of fossil arthropod. Expand
New anatomical information on Anomalocaris from the Cambrian Emu Bay Shale of South Australia and a reassessment of its inferred predatory habits
The morphology of the appendages, oral cone, gut diverticula and compound eyes of Anomalocaris, along with its large size, suggests that it was an active predator, and specimens of coprolites containing trilobite fragments andtrilobites with prominent injuries have been cited as evidence of anomalocaridid predation on trilOBites. Expand
New anomalocaridid appendages from the Burgess Shale, Canada
Abstract:  The complex history of description of the anomalocaridids has partly been caused by the fragmentary nature of these fossils. Frontal appendages and mouth parts are more readily preservedExpand