Biodiversity, biofacies and biogeography of middle Cambrian (Series 3) arthropods (Trilobita and Agnostida) on the East Gondwana margin

Hally, Lee A.; Paterson, John R.

doi:10.1016/j.gr.2014.04.002

Cited by 20 publications

(5 citation statements)

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“…times (e.g. Álvaro et al 2013;Hally & Paterson, 2014). Given that North China is not close to North America in any of these palaeogeographical reconstructions, it can be concluded that Sidneyia was more widespread than previously thought.…”

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confidence: 73%

First occurrence of the Cambrian arthropodSidneyiaWalcott, 1911 outside of Laurentia

2019

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The arthropod Sidneyia Walcott, 1911 is a remarkable animal of the Burgess Shale biota (Cambrian Miaolingian, Wuliuan; British Columbia, Canada), which has not been confidently reported from other Cambrian Konservat-Lagerstätten. Here we report the discovery of Sidneyia cf. inexpectans from the Wuliuan Mantou Formation of North China, which substantially expands the known palaeogeographical distribution of this genus. Our discovery suggests that Sidneyia had much greater dispersal ability than hitherto thought. It also confirms the presence of exceptionally preserved fossils in the Wuliuan Mantou Formation, one of the rare Burgess Shale-type deposits of North China.

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confidence: 73%

First occurrence of the Cambrian arthropodSidneyiaWalcott, 1911 outside of Laurentia

2019

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“…Interpreting this greater diversity of pelagic components, especially agnostoids, in relation to palaeoenvironmental setting is challenging. Cambrian agnostoids tend to be associated with distal shelf to slope biofacies in low- and mid-latitude regions ( Robison, 1976 ; Sundberg, 1991 ; Pegel, 2000 ; Peng, Babcock & Cooper, 2012 ; Hally & Paterson, 2014 ; Babcock et al, 2015 , Babcock, Peng & Ahlberg, 2017 ), and many taxa have extensive palaeogeographical ranges allowing their use for intercontinental correlation ( Robison, 1976 ; Peng & Robison, 2000 ; Peng, Babcock & Cooper, 2012 ; Álvaro et al, 2013 ; Babcock et al, 2015 , Babcock, Peng & Ahlberg, 2017 ). Whether agnostoids are interpreted as epibenthic (see definition above) or pelagic organisms ( Esteve & Zamora, 2014 and references therein), the doubling of their specific diversity between the upper Wheeler strata and those of the middle Marjum suggests a deepening of the environment.…”

Section: Discussionmentioning

confidence: 99%

The diverse radiodont fauna from the Marjum Formation of Utah, USA (Cambrian: Drumian)

Pates

Lerosey‐Aubril

Daley

et al. 2021

PeerJ

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Radiodonts have long been known from Cambrian deposits preserving non-biomineralizing organisms. In Utah, the presence of these panarthropods in the Spence and Wheeler (House Range and Drum Mountains) biotas is now well-documented. Conversely, radiodont occurrences in the Marjum Formation have remained scarce. Despite the large amount of work undertaken on its diverse fauna, only one radiodont (Peytoia) has been reported from the Marjum Biota. In this contribution we quadruple the known radiodont diversity of the Marjum fauna, with the description of the youngest members of two genera, Caryosyntrips and Pahvantia, and that of a new taxon Buccaspinea cooperi gen. et sp. nov. This new taxon can be identified from its large oral cone bearing robust hooked teeth with one, two, or three cusps, and by the unique endite morphology and organisation of its frontal appendages. Appendages of at least 12 podomeres bear six recurved plate-like endites proximal to up to four spiniform distal endites. Pahvantia hastata specimens from the Marjum Formation are particularly large, but otherwise morphologically indistinguishable from the carapace elements of this species found in the Wheeler Formation. One of the two new Caryosyntrips specimens can be confidently assigned to C. camurus. The other bears the largest spines relative to appendage length recorded for this genus, and possesses endites of variable size and unequal spacing, making its taxonomic assignment uncertain. Caryosyntrips, Pahvantia, and Peytoia are all known from the underlying Wheeler Formation, whereas isolated appendages from the Spence Shale and the Wheeler Formation, previously assigned to Hurdia, are tentatively reidentified as Buccaspinea. Notably, none of these four genera occurs in the overlying Weeks Formation, providing supporting evidence of a faunal restructuring around the Drumian-Guzhangian boundary. The description of three additional nektonic taxa from the Marjum Formation further documents the higher relative proportion of free-swimming species in this biota compared to those of the Wheeler and Weeks Lagerstätten. This could be related to a moderate deepening of the basin and/or changing regional ocean circulation at this time.

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“…C. falcatus from the same section and fossiliferous layer. Given that paleogeographic reconstructions place North China far from Laurentia in the middle Cambrian (e.g., Álvaro et al, 2013;Hally and Paterson, 2014;Torsvik and Cocks, 2017), the discovery of these common taxa provides three implications. It could suggest that Cambroraster and Sidneyia (at least in the larval stage) were particularly good dispersers, that the biological features of the carbonate platform in different regions were relatively uniform at that time, or that North China and Laurentia were linked by ocean currents (Ross, 1975).…”

Section: Discussionmentioning

confidence: 99%

Occurrence of the hurdiid radiodontCambrorasterin the middle Cambrian (Wuliuan) Mantou Formation of North China

2020

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The hurdiid radiodont Cambroraster is characterized by a prominent horseshoe-shaped head carapace, which bears conspicuous posterolateral spinous processes and covers half of the body length, and a pair of frontal appendages possessing rake-like endites. Here we report the discovery of characteristic central and lateral elements as well as a possible appendage endite for Cambroraster from the Cambrian Wuliuan Mantou Formation of North China. This discovery suggests that Cambroraster had dispersed over a wide biogeographic range and expands the geographic range of Hurdiidae. The increasing discoveries of exceptionally preserved fossils in the Upper Shale Member of the Mantou Formation indicate that this horizon is a promising Burgess Shale–type Lagerstätte.

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Biodiversity, biofacies and biogeography of middle Cambrian (Series 3) arthropods (Trilobita and Agnostida) on the East Gondwana margin

Cited by 20 publications

References 123 publications

First occurrence of the Cambrian arthropodSidneyiaWalcott, 1911 outside of Laurentia

First occurrence of the Cambrian arthropodSidneyiaWalcott, 1911 outside of Laurentia

The diverse radiodont fauna from the Marjum Formation of Utah, USA (Cambrian: Drumian)

Occurrence of the hurdiid radiodontCambrorasterin the middle Cambrian (Wuliuan) Mantou Formation of North China

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