A restudy of the Burgess Shale (Cambrian) arthropod<i>Emeraldella brocki</i>and reassessment of its affinities

Stein, Martin; Selden, Paul A.

doi:10.1080/14772019.2011.566634

Cited by 64 publications

(152 citation statements)

References 47 publications

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“…The specimens were documented dry under polarized light with a Canon EOS Rebel T3i camera with a MP-E 65mm macro lens and a Canon Macro Twin Lite MT-24EX flashlight. Polarised light enhances the contrast of the fossil against the matrix significantly (Schaarschmidt 1973, Bengtson 2000 and especially highlights finest detail such as setae or spines (Haug et al 2011(Haug et al , 2012aStein & Selden 2012).…”

Section: Methodsmentioning

confidence: 99%

“…A 3D model of a generalised trunk appendage in Fig. 1D, E was reconstructed in open-source software Blender based on the photographs Stein et al 2008;Haug et al 2010Haug et al , 2011Haug et al , 2012aStein & Selden 2012).…”

Section: Methodsmentioning

confidence: 99%

“…Serially arranged small setose paddles on the exopod occur also in several other Cambrian arthropods, among them Emeraldella brocki (Burgess Shale) (Stein & Selden 2012), Retifacies abnormalis and Kuamaia lata (both Chengjiang fauna) (Hou & Bergström 1997). Naraoia compacta appendages might thus not be so special at all; this distinct appendage morphology, serially arranged paddles on the exopod, could characterise a large group of Cambrian arthropods.…”

Section: Phylogenetic Implicationsmentioning

confidence: 99%

“…In recent years the interpretation of Cambrian arthropods, especially of their appendage morphologies had to be corrected (Stein & Selden 2012;García-Bellido & Collins 2006Haug et al 2011Haug et al , 2012a. Many of them proved to be less different from the generally expected morphology than previously assumed (e.g.…”

Section: Phylogenetic Implicationsmentioning

confidence: 99%

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New insights into the appendage morphology of the Cambrian trilobite-like arthropod Naraoia compacta

Haug¹,

Haug²

2016

Bull. Geosci.

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For understanding the life habits of extinct organisms, functional morphology is of crucial importance. In arthropods, the morphology of the appendages in particular gives insights into the mode of life. Yet, in the fossil record of arthropods mainly dorsal structures are preserved, as they are often more sclerotised or even mineralised. Exceptions are, for example, the species of Naraoia from the Cambrian Burgess Shale (about 508 million years old), of which the appendages are also preserved. We present here new details of the appendages of Naraoia compacta, which were made visible with modern imaging methods that were not yet available during former investigations. According to our re-study, the appendage shows a division into basipod, endopod and exopod. The basipod-body joint has not been visible to earlier investigators, and both basipod and endopod are significantly more strongly adorned than previously interpreted. The most important difference to earlier studies regards our interpretation of the exopod morphology. According to our new data, the exopod is composed of a series of similar, small paddles attached to a shaft, and not feather-like in appearance. This morphology has a strong impact on the swimming behaviour of N. compacta, as the paddles can be closed to form a functionally single large paddle during the power stroke, and will be opened during the recovery stroke to reduce the water drag. In this way, our new data provide important insights into the life habits of this long extinct species. •

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Phylogenetic Implicationsmentioning

confidence: 99%

Section: Phylogenetic Implicationsmentioning

confidence: 99%

See 2 more Smart Citations

New insights into the appendage morphology of the Cambrian trilobite-like arthropod Naraoia compacta

Haug¹,

Haug²

2016

Bull. Geosci.

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“…-Stein and Selden (2011) provided an emended diagnosis for Artiopoda. We here present evidence that Molaria spinifera Walcott, 1912, belongs to Artiopoda, based on exopod structure, which is one of the diagnostic characters, but it does not share the diagnostic character of filiform antennulae.…”

Section: Artiopoda Hou and Bergström 1997mentioning

confidence: 99%

A new Cambrian arthropod, Emeraldella brutoni, from Utah

Stein

Church²,

Robison

2011

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Emeraldella is a rare arthropod of relatively large body size that belongs with the trilobite-like arthropods, Artiopoda. E. brutoni n. sp. from the Wheeler Formation of west-central Utah is the second species described and marks the first confirmed occurrence of Emeraldella outside the Burgess Shale of British Columbia. An articulated, flagelliform telson, similar to that of the Burgess Shale taxon Molaria, is recognized in Emeraldella. Evidence for the presence of lamellae on the exopods of Molaria is presented, supporting affinity of that taxon with Artiopoda. A close relationship between Emeraldella and Molaria is tentatively suggested, based on the morphology of tergites and telson.

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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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A restudy of the Burgess Shale (Cambrian) arthropodEmeraldella brockiand reassessment of its affinities

Cited by 64 publications

References 47 publications

New insights into the appendage morphology of the Cambrian trilobite-like arthropod Naraoia compacta

New insights into the appendage morphology of the Cambrian trilobite-like arthropod Naraoia compacta

A new Cambrian arthropod, Emeraldella brutoni, from Utah

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

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