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The Burgess Shale Anomalocaridid Hurdia and Its Significance for Early Euarthropod Evolution
- A. Daley, G. Budd, Jean‐Bernard Caron, G. Edgecombe, D. Collins
- Environmental Science, GeographyScience
- 20 March 2009
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.
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 of…
A primitive fish from the Cambrian of North America
Phylogenetic analysis places Metaspriggina as a basal vertebrate, apparently close to the Chengjiang taxa Haikouichthys and Myllokunmingia, demonstrating also that this primitive group of fish was cosmopolitan during Lower–Middle Cambrian times.
Cambrian bivalved arthropod reveals origin of arthrodization
- David A. Legg, M. Sutton, G. Edgecombe, Jean‐Bernard Caron
- Environmental Science, GeographyProceedings of the Royal Society B: Biological…
- 7 December 2012
A cladistic analysis resolved a new arthropod from the Tulip Beds locality of the Burgess Shale Formation as the basal-most member of a paraphyletic grade of nekto-benthic forms with bivalved carapaces and suggests that arthrodization (sclerotization and jointing of the exoskeleton) evolved to facilitate swimming.
Tentaculate Fossils from the Cambrian of Canada (British Columbia) and China (Yunnan) Interpreted as Primitive Deuterostomes
The evidence is suggested that the evidence is more consistent with the ambulacraria being primitive deuterostomes, with specific comparisons being made to the pterobranch hemichordates and pre-radial echinoderms.
Hyoliths are Palaeozoic lophophorates
- J. Moysiuk, Martin R. Smith, Jean‐Bernard Caron
- Geography, Environmental ScienceNature
- 19 January 2017
This work reconstructs Haplophrentis as a semi-sessile, epibenthic suspension feeder that could use its helens to elevate its tubular body above the sea floor and indicates an affinity with the lophophorates (brachiopods, phoronids and tommotiids), substantially increasing the morphological disparity of this prominent group.
Halwaxiids and the Early Evolution of the Lophotrochozoans
A new scleritomous fossil from the Burgess Shale has the prominent anterior shell of the halkieriids but also bears wiwaxiid-like sclerites, indicating that they have a key place in early lophotrochozoan history.
A soft-bodied mollusc with radula from the Middle Cambrian Burgess Shale
Odontogriphus omalus is interpreted to be members of an early stem-group mollusc lineage that probably originated in the Neoproterozoic Ediacaran Period, providing support for the retention of a biomat-based grazing community from the late Precambrian Period until at least the Middle Cambrian.
Burgess Shale fossils illustrate the origin of the mandibulate body plan
The presence of crustaceomorph traits in the Cambrian larvae of various clades basal to Mandibulata is reinterpreted as evidence for the existence of distinct ontogenetic niches among stem arthropods and Hymenocarines now illustrate that the subdivision of the basipod and the presence of proximal endites are likely to have been ancestral conditions critical for the evolution of coxal and pre-coxal features in mandibulates.
A new hurdiid radiodont from the Burgess Shale evinces the exploitation of Cambrian infaunal food sources
- J. Moysiuk, Jean‐Bernard Caron
- Environmental Science, GeographyProceedings of the Royal Society B
- 14 August 2019
Cambroraster illuminates the evolution of Hurdiidae and evinces the exploitation of the diversifying infauna by these large and specialized nektobenthic carnivores in the aftermath of the Cambrian explosion.