<i>Messorocaris</i>, a new sanctacaridid-like arthropod from the middle Cambrian Wheeler Formation (Utah, USA)

Lerosey‐Aubril, Rudy; Skabelund, Jacob

doi:10.1017/s0016756817000504

Cited by 11 publications

(16 citation statements)

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“…Briggs et al . 2008; Lerosey‐Aubril & Skabelund 2018). The last two localities, that is, the western Gogia Quarry (GPS: 39.326208, −113.297262) and the Naraoia Quarry (GPS: 39.293283, −113.307995), were until now not known to yield soft‐bodied fossils.…”

Section: Methodsmentioning

confidence: 99%

“…As mentioned above, however, the compositions of these assemblages in the House Range and the Drum Mountains differ significantly, and therefore they are better regarded as two distinct, subcontemporaneous biotas (Robison 1991; Robison et al . 2015; Lerosey‐Aubril & Skabelund 2018).…”

Section: Geological Settingmentioning

confidence: 99%

“…In summary, the Wheeler panarthropods from the House Range, including the five species reported for the first time herein, illustrate particularly well the presence of two clearly distinct exceptionally preserved biotas in the Wheeler Formation (Robison 1991; Robison et al . 2015; Lerosey‐Aubril & Skabelund 2018). The Wheeler‐HR fauna is richer in pelagic forms, such as agnostines and radiodonts, possibly owing to a greater distance from the coast.…”

Section: Wheeler‐hr Panarthropod Faunamentioning

confidence: 99%

“…Although subcontemporaneous (Miaolingian, Drumian) and originating from localities only 25 km apart, the Wheeler fossil assemblages of the House Range (Wheeler‐HR) and of the Drum Mountains (Wheeler‐DM) notably differ in composition (Robison et al . 2015; Lerosey‐Aubril & Skabelund 2018). Both contain more than 80 species, including more than 30 soft‐bodied ones (tier 2 deposits of Gaines 2014), but only 37 species are known from both areas.…”

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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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Section: Methodsmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Wheeler‐hr Panarthropod Faunamentioning

confidence: 99%

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confidence: 99%

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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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“…Known as the House Range Embayment, this basin is reconstructed as asymmetrical (i.e., a half-graben; Rees, 1986), transitioning to the carbonate bank by a gently sloping ramp to the East (now North), but abruptly separated from it to the West and probably South (now South and East, respectively; Foster & Gaines, 2016). The upper part of the Wheeler Formation has yielded subcontemporaneous, but largely distinct, exceptionally-preserved biotas in the House Range and Drum Mountains of western Utah (Robison, Babcock & Gunther, 2015;Lerosey-Aubril & Skabelund, 2018;Lerosey-Aubril et al, in press), both of early Drumian age according to associated agnostoids (Ptychagnostus atavus Zone; Robison & Babcock, 2011). Thelxiope exemplifies well this dissimilarity between the two Wheeler faunas, as it is rare but represented by two species in the House Range, and as-yet unreported the Drum Mountains.…”

Section: Geological Settingmentioning

confidence: 99%

Revision of the mollisoniid chelicerate(?) Thelxiope, with a new species from the middle Cambrian Wheeler Formation of Utah

Lerosey‐Aubril

Skabelund²,

Ortega‐Hernández

2020

PeerJ

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The recent re-interpretation of the Lower Palaeozoic euarthropod group Mollisonia as belonging to Chelicerata has triggered a renewed interest for the poorly known family Mollisoniidae. In this contribution, we revise the anatomy, taxonomic diversity, and systematics of Thelxiope, the sister-taxon of Mollisonia. This mollisoniid genus comprises four species, and is characterized by the presence of one cephalic, seven thoracic (one per tergite), and three pygidial long sagittal spines. The type species, T. palaeothalassia Simonetta & Delle Cave, is a rare taxon in the Wuliuan Burgess Shale Formation of Canada, which can be recognized by the hypertrophy of a single of its sagittal spines, the posteriomost one. T. spinosa (Conway Morris & Robison)–a species originally assigned to a distinct genus ‘Ecnomocaris’ herein synonymised with Thelxiope–is known from a single specimen found in the Drumian Wheeler Formation of the House Range of Utah. It differs from the type-species in the hypertrophy of both the anteriormost (cephalic) and the posteriormost (third pygidial) sagittal spines. The same Wheeler strata have also yielded a single specimen of a new taxon, T. holmani sp. nov., which lacks hypertrophied sagittal spines and features blunt thoracic tergopleural tips. A putative fourth species, referred to Thelxiope sp. nov. A, extends the stratigraphical range of Thelxiope to the Lower Ordovician (Tremadocian), and its palaeographic range to West Gondwana. Currently under study, this relatively common component of the lower Fezouata Shale fauna is only briefly discussed. Features characterizing the genus Thelxiope and its components almost exclusively pertain to the sagittal spines, for the scarcity and inconsistent preservation of the Cambrian materials as-yet available preclude a confident assessment of the variability of other morphological features. The pygidium in Thelxiope and Mollisonia is not composed of four, but three tergites essentially similar to thoracic ones, except for the lack of articulations.

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Systematics, preservation and biogeography of radiodonts from the southern Great Basin, USA, during the upper Dyeran (Cambrian Series 2, Stage 4)

Pates

Daley

Edgecombe

et al. 2019

Papers in Palaeontology

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Anomalocaris, the most well‐known genus of the diverse stem euarthropod group Radiodonta, was first reported over 100 years ago from the Burgess Shale (Canada). This large Cambrian apex predator was later treated as occurring in the southern Great Basin (California and Nevada, USA). We re‐evaluate the systematic affinities of previously described material from the Pioche Formation, Nevada, and the Latham Shale, California, and describe the first radiodonts from the Pyramid Shale Member, Carrara Formation, California. Latham Shale (Cambrian Series 2, Stage 4, upper Dyeran) specimens previously assigned to Anomalocaris are reinterpreted as Ramskoeldia consimilis?, an amplectobeluid previously known only from the Chengjiang biota (Cambrian Series 2, Stage 3). Younger material from the Pioche and Carrara Formations (Series 2, Stage 4) is described as a new Anomalocaris species, A. magnabasis. This new species sheds light on the two‐part structure of Anomalocaris ventral endites, a potentially important character for distinguishing species, and reveals a sequence of five disarticulation stages for frontal appendages. The oldest Hurdia from Laurentia is also reported from the Pioche Formation (Cambrian Series 2, Stage 4). A changeover in taxonomic composition of the Radiodonta in the southern Great Basin is recognized: Anomalocaris replaces Ramskoeldia in the upper Dyeran, but it is not associated with a replacement of local olenelloid trilobites or seen in radiodonts elsewhere in Laurentia. These new data, combined with a summary of known radiodont occurrences, suggest that Anomalocaris species did not have large geographical distributions, when compared with other radiodonts such as Hurdia and Caryosyntrips.

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Messorocaris, a new sanctacaridid-like arthropod from the middle Cambrian Wheeler Formation (Utah, USA)

Cited by 11 publications

References 13 publications

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

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

Revision of the mollisoniid chelicerate(?) Thelxiope, with a new species from the middle Cambrian Wheeler Formation of Utah

Systematics, preservation and biogeography of radiodonts from the southern Great Basin, USA, during the upper Dyeran (Cambrian Series 2, Stage 4)

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