A new radiodont (stem Euarthropoda) frontal appendage with a mosaic of characters from the Cambrian (Series 2 Stage 3) Chengjiang biota

Guo, Jin; Pates, Stephen; Peng, Cong; Daley, Allison C.; Edgecombe, Gregory D.; Chen, Taimin; Hou, Xianguang

doi:10.1002/spp2.1231

Cited by 31 publications

(48 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The terminology used in our descriptions broadly follows Guo et al (2019) and Lerosey-Aubril et al (2020) for frontal appendages. The term ‘plate-like endite’ is equivalent to ‘blade-like endites’ ( Guo et al, 2019 ), ‘broad, elongate endites’ ( Moysiuk & Caron, 2019 ) and ‘elongated ventral spines’ ( Daley, Budd & Caron, 2013 ) in other recent works. The term ‘distal endites’ is used to refer to the simple spiniform endites borne on podomeres distal to those which bear plate-like endites, following Pates et al (2019) .…”

Section: Methodsmentioning

confidence: 99%

“…For instance, radiodonts are represented by at least nine genera in Chengjiang (all localities together; Zeng et al, 2018 , tab. S1; Cong et al, 2018 ; Guo et al, 2019 ; Liu et al, 2020 ), seven genera in the Burgess Shale ( Moysiuk & Caron, 2019 ; Zeng et al, 2018 , tab. S1)—three to five of them occurring in the most studied localities ( Daley & Budd, 2010 ; Daley, Budd & Caron, 2013 ; O’Brien & Caron, 2016 )—and four genera in the Kinzers Formation ( Pates & Daley, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Pates

Lerosey‐Aubril

Daley

et al. 2021

PeerJ

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Pates

Lerosey‐Aubril

Daley

et al. 2021

PeerJ

Self Cite

View full text Add to dashboard Cite

show abstract

“…[16, 25]). The term ‘endite’ is used (following [36]), and is equivalent to ‘ventral spine’ and ‘ventral blade’ used in other studies (e.g. [37, 38]).…”

Section: Methodsmentioning

confidence: 99%

First report of paired ventral endites in a hurdiid radiodont

2019

Self Cite

View full text Add to dashboard Cite

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 and phylogenetic affinity of these large nektonic animals have revealed the origins of the euarthropod compound eye and biramous limb, and interpretations of their diverse feeding styles have placed various radiodont taxa as primary consumers and apex predators. Critical to our understanding of both radiodont evolution and ecology are the paired frontal appendages; however, the vast differences in frontal appendage morphology between and within different radiodont 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) Mount Cap Formation (Northwest Territories, Canada) and Jangle Limestone (Nevada, USA). Ursulinacaris has the same organisation as other hurdiid frontal appendages, with elongate endites on the first five podomeres in the distal articulated region and auxiliary spines on the distal margin of endites only. Unlike all other hurdiid genera, which possess 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 appendage characters known only in hurdiids, namely auxiliary spines on the distal margin of endites only, and elongate endites on the first five podomeres in the distal articulated region only, predate this innovation.

show abstract

“…2018; Lerosey‐Aubril & Pates 2018; Guo et al . 2019; Moysiuk & Caron 2019a). Although most radiodont families are represented, with the exception of Tamisiocarididae, hurdiids clearly dominate in both diversity and abundance (e.g.…”

Section: Wheeler‐hr Panarthropod Faunamentioning

confidence: 99%

New exceptionally preserved panarthropods from the Drumian Wheeler Konservat‐Lagerstätte of the House Range of Utah

Lerosey‐Aubril

Kimmig

Pates

et al. 2020

Papers in Palaeontology

Self Cite

View full text Add to dashboard Cite

The Drumian Wheeler Konservat-Lagerst€ atte of the House Range of Utah (Wheeler-HR) has yielded one of the most diverse exceptionally preserved Cambrian biotas of North America. The discovery of soft-bodied fossils invariably provides precious insights into this biota, given that most of its non-biomineralizing components are known from very few specimens. This contribution describes some 30 new exceptionally preserved fossils of Wheeler panarthropods. Two new species are recognized, the radiodont Hurdia sp. nov. A and the megacheiran Kanoshoia rectifrons gen. et sp. nov. Along with a species of Leanchoilia, K. rectifrons represents the first confident megacheiran record in these strata. The presence of the radiodont genus Amplectobelua and the isoxyid species Isoxys longissimus is reported outside of the Burgess Shale in Laurentia. New specimens of Caryosyntrips serratus, Naraoia compacta, Messorocaris magna and Mollisonia symmetrica provide insights into the phylogenetic affinities, local spatial distribution and morphological variation of these species hitherto known by single specimens in the Wheeler-HR. The same is true of new materials of the more common Pahvantia hastata and Perspicaris? dilatus. Formal descriptions of the order Mollisoniida ord. nov. and family Mollisoniidae fam. nov. are also provided. Last, the preservation of body structures other than the dorsal exoskeletons is illustrated for the first time in two common components of the fauna: the agnostid Itagnostus interstrictus and the bivalved euarthropod Pseudoarctolepis sharpi. The new material substantially improves our understanding of the diversity of the Wheeler-HR biota, and provides new evidence of its distinctiveness relative to the Wheeler biota of the Drum Mountains.

show abstract

A new radiodont (stem Euarthropoda) frontal appendage with a mosaic of characters from the Cambrian (Series 2 Stage 3) Chengjiang biota

Cited by 31 publications

References 29 publications

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

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

First report of paired ventral endites in a hurdiid radiodont

New exceptionally preserved panarthropods from the Drumian Wheeler Konservat‐Lagerstätte of the House Range of Utah

Contact Info

Product

Resources

About