A rare non‐trilobite artiopodan from the <scp>G</scp>uzhangian (<scp>C</scp>ambrian <scp>S</scp>eries 3) <scp>W</scp>eeks <scp>F</scp>ormation <scp>K</scp>onservat‐<scp>L</scp>agerstätte in <scp>U</scp>tah, <scp>USA</scp>

Ortega‐Hernández, Javier; Lerosey‐Aubril, Rudy; Kier, Carlo; Bonino, Enrico

doi:10.1111/pala.12136

Cited by 14 publications

(9 citation statements)

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“…Some of these newcomers would become dominant in the Ordovician as parts of the Palaeozoic Evolutionary Fauna 73 , whereas others would have a more limited evolutionary success (e.g. refs 74 and 75 ).…”

Section: Discussionmentioning

confidence: 99%

The Vicissicaudata revisited – insights from a new aglaspidid arthropod with caudal appendages from the Furongian of China

Lerosey‐Aubril

Zhu

Ortega‐Hernández

2017

Sci Rep

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Cambrian marine ecosystems were dominated by arthropods, and more specifically artiopods. Aglaspidids represent an atypical group amongst them, not the least because they evolved and rapidly diversified during the late Cambrian, a time interval between the two diversification events of the Early Palaeozoic. Recent phylogenetic analyses have retrieved aglaspidids within the Vicissicaudata, a potentially important, but difficult to define clade of artiopods. Here we describe a new aglaspidid from the Furongian Guole Konservat-Lagerstätte of South China. This taxon displays a pretelsonic segment bearing non-walking appendages, features as-yet known in all vicissicaudatans, but aglaspidids. A new comprehensive phylogenetic analysis provides strong support for the legitimacy of a monophyletic clade Vicissicaudata, and demonstrates the pertinence of new characters to define Aglaspidida. It also motivates important changes to the systematics of the phylum, including the elevation of Artiopoda to the rank of subphylum, and the establishment of a new superclass Vicissicaudata and a new aglaspidid family Tremaglaspididae. Two diversification pulses can be recognized in the early history of artiopods – one in the early Cambrian (trilobitomorphs) and the other in the late Cambrian (vicissicaudatans). The discrepancy between this pattern and that traditionally depicted for marine invertebrates in the Early Palaeozoic is discussed.

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Section: Discussionmentioning

confidence: 99%

The Vicissicaudata revisited – insights from a new aglaspidid arthropod with caudal appendages from the Furongian of China

Lerosey‐Aubril

Zhu

Ortega‐Hernández

2017

Sci Rep

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“…Last, considering the emphasis put on this character above, it might be worth mentioning that sickle‐shaped pleural spines also characterize the euarthropod Falcatamacaris from the Guzhangian Weeks Formation of western Utah (Ortega‐Hernández et al . 2015). However, Messorocaris is easily distinguished from this younger genus by: (1) its strongly vaulted axial region that extends to the anterior cephalic margin, a character shared with sanctacaridids (Lerosey‐Aubril & Skabelund 2018); (2) the greater length/width ratios of its cephalic shield (>0.5) and anterior trunk tergites (>0.25; <0.35 and <0.2, respectively, in Falcatamacaris ); (3) the more gradual evolution of the shape of its trunk pleurae posteriorly (abrupt change between T8 and T9 in Falcatamacaris ); and (4) the greater distances separating these pleurae (pleural tips almost touching one another abaxially in the Weeks euarthropod).…”

Section: Systematic Palaeontologymentioning

confidence: 99%

“…It also lacks the weakly biomineralized (calcitic) dorsal cuticle that seems to characterize Falcatamacaris (Ortega‐Hernández et al . 2015).…”

Section: Systematic Palaeontologymentioning

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

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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.

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“…In this regard, it is noteworthy that the presence of 11 trunk tergites is a widespread feature in phylogenetically basal early Palaeozoic euarthropod groups (e.g. Edgecombe, García-Bellido & Paterson, 2011; Lamsdell, 2013; Ortega-Hernández et al 2015). The fact that T. unite, Tremaglaspis sp.…”

Section: Discussionmentioning

confidence: 99%

A new aglaspidid euarthropod with a six-segmented trunk from the Lower Ordovician Fezouata Konservat-Lagerstätte, Morocco

2015

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A new euarthropod with an uncommon morphology, Brachyaglaspis singularis gen. et sp. nov., is described from the Early Ordovician (middle Floian) Fezouata biota of Morocco. The presence of a pair of postventral plates, widely attached to each other and located under the posterior-most trunk tergite and the base of the tailspine, indicates a phylogenetic relationship with the enigmatic group Aglaspidida. The overall morphology of Brachyaglaspis most closely resembles that of the 'Ordovician-type' aglaspidids, more specifically the late Cambrian -Early Ordovician genus Tremaglaspis. However, the presence of a prominent cephalon and only six trunk tergites in the new genus deviates from the organization of all other known aglaspidid species, notably extending the known range of morphological disparity of the group. A taxonomic revision of this euarthropod group indicates that the most accurate name and authorship combination correspond to Aglaspidida Walcott, 1912.

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A rare non‐trilobite artiopodan from the Guzhangian (Cambrian Series 3) Weeks Formation Konservat‐Lagerstätte in Utah, USA

Cited by 14 publications

References 50 publications

The Vicissicaudata revisited – insights from a new aglaspidid arthropod with caudal appendages from the Furongian of China

The Vicissicaudata revisited – insights from a new aglaspidid arthropod with caudal appendages from the Furongian of China

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

A new aglaspidid euarthropod with a six-segmented trunk from the Lower Ordovician Fezouata Konservat-Lagerstätte, Morocco

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