Biogeography and affinities of the bradoriid arthropods: Cosmopolitan microbenthos of the Cambrian seas

Williams, Mark; Siveter, David J.; Popov, Leonid E.; Vannier, Jean-Claude

doi:10.1016/j.palaeo.2006.12.004

Cited by 62 publications

(104 citation statements)

References 49 publications

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“…Ostracod-type carapaces are known from the Early Ordovician and may extend back to the Cambrian in the guise of particular bradoriids (49). However, the Deadwood mandible provides the only appendagebased evidence for ostracods before the Silurian Herefordshire Lagerstätte, a unit that it predates by some 70 Myr (50).…”

Section: Discussionmentioning

confidence: 99%

Exceptionally preserved crustaceans from western Canada reveal a cryptic Cambrian radiation

Harvey

Vélez

Butterfield

2012

Proc. Natl. Acad. Sci. U.S.A.

107

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The early history of crustaceans is obscured by strong biases in fossil preservation, but a previously overlooked taphonomic mode yields important complementary insights. Here we describe diverse crustacean appendages of Middle and Late Cambrian age from shallow-marine mudstones of the Deadwood Formation in western Canada. The fossils occur as flattened and fragmentary carbonaceous cuticles but provide a suite of phylogenetic and ecological data by virtue of their detailed preservation. In addition to an unprecedented range of complex, largely articulated filtering limbs, we identify at least four distinct types of mandible. Together, these fossils provide the earliest evidence for crown-group branchiopods and total-group copepods and ostracods, extending the respective ranges of these clades back from the Devonian, Pennsylvanian, and Ordovician. Detailed similarities with living forms demonstrate the early origins and subsequent conservation of various complex food-handling adaptations, including a directional mandibular asymmetry that has persisted through half a billion years of evolution. At the same time, the Deadwood fossils indicate profound secular changes in crustacean ecology in terms of body size and environmental distribution. The earliest radiation of crustaceans is largely cryptic in the fossil record, but “small carbonaceous fossils” reveal organisms of surprisingly modern aspect operating in an unfamiliar biosphere.

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Section: Discussionmentioning

confidence: 99%

Exceptionally preserved crustaceans from western Canada reveal a cryptic Cambrian radiation

Harvey

Vélez

Butterfield

2012

Proc. Natl. Acad. Sci. U.S.A.

107

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“…These arthropods are represented by the Order Bradoriida Raymond, 1935 (Bradoriida sensu stricto) and Phosphatocopida Müller, 1964(Hou et al 2002Maas & Waloszek, 2005;Williams et al 2007;Zhang, 2007). The former are regarded at present as stemgroup crustaceans, whereas the latter are considered by some to be crown-group crustaceans (Hou et al 1996(Hou et al , 2010Shu et al 1999).…”

Section: M Bradoriidsmentioning

confidence: 99%

Chronology of early Cambrian biomineralization

et al. 2011

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-Data on the first appearances of major animal groups with mineralized skeletons on the Siberian Platform and worldwide are revised and summarized herein with references to an improved carbon isotope stratigraphy and radiometric dating in order to reconstruct the Cambrian radiation (popularly known as the 'Cambrian explosion') with a higher precision and provide a basis for the definition of Cambrian Stages 2 to 4. The Lophotrochozoa and, probably, Chaetognatha were first among protostomians to achieve biomineralization during the Terreneuvian Epoch, mainly the Fortunian Age. Fast evolutionary radiation within the Lophotrochozoa was followed by radiation of the sclerotized and biomineralized Ecdysozoa during Stage 3. The first mineralized skeletons of the Deuterostomia, represented by echinoderms, appeared in the middle of Cambrian Stage 3. The fossil record of sponges and cnidarians suggests that they acquired biomineralized skeletons in the late Neoproterozoic, but diversification of both definite sponges and cnidarians was in parallel to that of bilaterians. The distribution of calcium carbonate skeletal mineralogies from the upper Ediacaran to lower Cambrian reflects fluctuations in the global ocean chemistry and shows that the Cambrian radiation occurred mainly during a time of aragonite and high-magnesium calcite seas.

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“…Quantitative and semiquantitative studies of Cambrian faunas, mostly trilobites and brachiopods, have been carried out for decades for palaeobiogeographic applications (Pillola, 1990;Lieberman, 1997;Brock et al, 2000;Álvaro et al, 2003;Elicki, 2005;Williams et al, 2007;Álvaro et al, 2013). However, pre-trilobitic SSFs have only been rarely used for quantitative palaeobiogeographic reconstructions .…”

Section: Introductionmentioning

confidence: 99%

Early Cambrian palaeobiogeography of the Zhenba–Fangxian Block (South China): Independent terrane or part of the Yangtze Platform?

2015

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Biogeography and affinities of the bradoriid arthropods: Cosmopolitan microbenthos of the Cambrian seas

Cited by 62 publications

References 49 publications

Exceptionally preserved crustaceans from western Canada reveal a cryptic Cambrian radiation

Exceptionally preserved crustaceans from western Canada reveal a cryptic Cambrian radiation

Chronology of early Cambrian biomineralization

Early Cambrian palaeobiogeography of the Zhenba–Fangxian Block (South China): Independent terrane or part of the Yangtze Platform?

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