Hurdiid radiodontans from the middle Cambrian (Series 3) of Utah

Pates, Stephen; Daley, Allison C.; Lieberman, Bruce S.

doi:10.1017/jpa.2017.11

Cited by 33 publications

(32 citation statements)

References 47 publications

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“…In addition, Cambroraster represents the first discovery of hurdiid radiodonts in North China. This group has been found previously in Laurentia (e.g., Briggs et al, 2008;Daley et al, 2009Daley et al, , 2013Caron et al, 2010;Pates et al, 2017Pates et al, , 2018Pates et al, , 2019aLerosey-Aubril and Pates, 2018;Kimmig et al, 2019), South China (e.g., Liu, 2013;Zeng et al, 2017;Liu et al, 2020), West Gondwana (e.g., Van Roy and Briggs, 2011;Van Roy et al, 2015), and Baltica (e.g., Chlupác and Kordule, 2002;Daley and Legg, 2015). The discovery of a hurdiid in North China indicates that this group as a whole had a good dispersal ability, which could have contributed to its successful colonization in various ecological niches (Daley and Budd, 2010;Vinther et al, 2014;Van Roy et al, 2015;Lerosey-Aubril and Pates, 2018;Moysiuk and Caron, 2019).…”

Section: Discussionsupporting

confidence: 74%

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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Section: Discussionsupporting

confidence: 74%

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

2020

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“…), Hurdia victoria , Peytoia nathorsti (Conway Morris & Robison ; Pates et al . in press), and Stanleycaris (Pates et al . unpublished data) are all known from both the Burgess Shale and Utah Lagerstätten.…”

Section: Discussionmentioning

confidence: 97%

Caryosyntrips: a radiodontan from the Cambrian of Spain, USA and Canada

Pates

Daley

2017

Papers in Palaeontology

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Caryosyntrips appendages have previously been reported from the Burgess Shale (Cambrian, Stage 5), British Columbia, Canada. New specimens of the genus are here reported from the Wheeler Formation (Cambrian, Drumian) and Langston Formation, Spence Shale Member (Cambrian, Stage 5), Utah, USA. The original Burgess Shale specimens are re-examined alongside the new specimens. Caryosyntrips is shown to have paired ventral spines on each podomere. Three species of Caryosyntrips are recognized: C. serratus Daley & Budd, C. camurus sp. nov. and C. durus sp. nov., differentiated by the overall shape of their appendages and arrangement of dorsal and ventral spines. These differences have potential implications for the feeding methods employed by different species of Caryosyntrips. A specimen collected from the upper Valdemiedes Formation of Spain (Cambrian, Stage 4), previously described as the lobopodian Mureropodia apae G amez Vintaned et al., is reinterpreted as a Caryosyntrips appendage. This identification is supported by the overall shape of the fossil, and the presence, orientation and length:width ratio of ventral spines. However the dorsal surface of the appendage is not well preserved, and the appendage and its ventral spines are larger than those of other known Caryosyntrips. Therefore it is left in open nomenclature as C. cf. camurus. These new finds increase the temporal range of Caryosyntrips (Cambrian Series 2, Stage 4 to Series 3, Drumian) and the geographical range to a new continent: Gondwana.

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“…cf. P. nathorsti from the Balang Formation in China [45], Peytoia nathorsti from the Wheeler Formation [38], Hurdia from the Spence Shale [29,38], and Stanleycaris from the Wheeler Formation in Utah [37,44]. This suggests that paired endites were not present in Hurdia, Peytoia, or Stanleycaris.…”

Section: Discussionmentioning

confidence: 99%

“…The term 'endite' is used (following [36]), and is equivalent to 'ventral spine' and 'ventral blade' used in other studies (e.g. [37,38]). Measurements of the length of the whole appendage and width of individual podomeres refer to the dimension along the proximal-distal axis.…”

Section: Terminology and Orientationmentioning

confidence: 99%

First report of paired ventral endites in a hurdiid radiodont

Pates¹,

Daley²,

Butterfield³

2019

Preprint

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Background: Radiodonta, large Palaeozoic nektonic predators, occupy a pivotal evolutionary position as stem-euarthropods and filled important ecological niches in early animal ecosystems. Analyses of the anatomy andphylogenetic affinity of these large nektonic animals have revealed the origins of the euarthropod compound eye andbiramous limb, and interpretations of their diverse feeding styles have placed various radiodont taxa as primaryconsumers and apex predators. Critical to our understanding of both radiodont evolution and ecology are the pairedfrontal appendages; however, the vast differences in frontal appendage morphology between and within differentradiodont families have made it difficult to identify the relative timings of character acquisitions for this body part.Results: Here we describe a new genus of hurdiid, Ursulinacaris, from the middle Cambrian (Miaolingian, Wuliuan) MountCap Formation (Northwest Territories, Canada) and Jangle Limestone (Nevada, USA). Ursulinacaris has the sameorganisation as other hurdiid frontal appendages, with elongate endites on the first five podomeres in the distalarticulated region and auxiliary spines on the distal margin of endites only. Unlike all other hurdiid genera, whichpossess a single row of elongated and blade-like ventral endites, this taxon uniquely bears paired slender endites.Conclusion: The blade-like endite morphology is shown to be a hurdiid autapomorphy. Two other frontal appendagecharacters known only in hurdiids, namely auxiliary spines on the distal margin of endites only, and elongate enditeson the first five podomeres in the distal articulated region only, predate this innovation.

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Hurdiid radiodontans from the middle Cambrian (Series 3) of Utah

Abstract: Abstract.-Radiodontan body elements, some belonging to Peytoia and Hurdia and some

Cited by 33 publications

References 47 publications

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

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

Caryosyntrips: a radiodontan from the Cambrian of Spain, USA and Canada

First report of paired ventral endites in a hurdiid radiodont

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