The arthropodCheloniellon from the devonian hunsrück shale

Stürmer, Wilhelm; Bergström, Johan

doi:10.1007/bf03006730

Cited by 43 publications

(47 citation statements)

References 8 publications

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“…In particular, workers have drawn attention to similarities in abdominal and cephalic appendage morphology (Lehmann 1955, Stürmer & Bergström 1976, Wills et al 1998, Kühl et al 2008. The monophyly of Marrellomorpha was supported in the current analysis by four synapomorphies: 1) a lack of paratergal pleurae, 2) an elongate trunk composed of more than 25 segments, 3) elongation of the cephalic exopods, and 4) the possession of rounded trunk endopod endites.…”

Section: The Affinities Of Skania and Relationships Within Marrellomosupporting

confidence: 55%

“…A close relationship between the acercostrans and marrellids has been recognised for a long time (Stürmer & Bergström 1976). In particular, workers have drawn attention to similarities in abdominal and cephalic appendage morphology (Lehmann 1955, Stürmer & Bergström 1976, Wills et al 1998, Kühl et al 2008.…”

Section: The Affinities Of Skania and Relationships Within Marrellomomentioning

confidence: 99%

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The morphology and affinities of Skania fragilis (Arthropoda) from the middle Cambrian Burgess Shale

Legg¹

2015

Bull. Geosci.

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The enigmatic arthropod Skania fragilis, from the middle Cambrian (Series 3, Stage 5) Burgess Shale Formation (Yoho National Park, British Columbia, Canada), is redescribed based on 14 new specimens reposited at the Royal Ontario Museum. These specimens provide a clearer picture of the morphology of this taxon and help to resolve conflicting opinions regarding potential homology of particular features. Specifically, the anchor-shaped anterior, which has been compared to a similar structure in the putative Precambrian arthropod Parvancorina, is shown to represent an anterior cephalic doublure with features comparable to the mediolateral spines of marrellids, such as Marrella. Beyond a vaguely cordiform outline, no other features are shown to be shared between Skania and Parvancorina, weakening claims that crown-group arthropods were present in the Neoproterozoic. The removal of these taxa from Arthropoda is in keeping with recent molecular clock analyses, which demonstrate a Cambrian diversification of Euarthropoda. A phylogenetic analysis resolved Skania as the most basal member of Acercostraca, a clade of marrellomorphs including Vachonisia and Xylokorys, united by the presence of a cordiform dorsal shield. Similarities between these taxa and marrellids may indicate that the elongate posterior spines of Marrella and related taxa, and the dorsal shield of acercostracans have a common origin akin to the carapace anlagen of extant crustaceans.

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Section: The Affinities Of Skania and Relationships Within Marrellomosupporting

confidence: 55%

Section: The Affinities Of Skania and Relationships Within Marrellomomentioning

confidence: 99%

The morphology and affinities of Skania fragilis (Arthropoda) from the middle Cambrian Burgess Shale

Legg¹

2015

Bull. Geosci.

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“…In addition the technique has been used to locate fossils in the field (Sturmer, 1983) and to study the structure of soft part anatomy in exceptionally preserved faunas such as those of the Devonian Hunsruck Shales (Sturmer, 1970(Sturmer, , 1985Sturmer & Bergstrom, 1973, 1976, 1978, 1981Bergstrom, Sturmer & Winter, 1980). The technique has not previously been modified to examine microvertebrates.…”

Section: Discussionmentioning

confidence: 99%

Studies of tooth implantation in fossil tetrapods using high-resolution X-radiography

Fraser

Shelton

1988

Geol. Mag.

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The concept that reptilian tooth implantations fall neatly into a number of separate categories which can be used in phylogenetic studies is called into question. The use of microfocal Xradiography in preliminary studies of reptilian dentitions reveals that, at least in sphenodontids, there is no clear distinction between acrodonty and pleurodonty. Although the technique is used here specifically in connection with microvertebrates, it may have considerable potential in evaluating internal structures in a wide range of fossils.

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“…The appendages show similarities to those of both M. splendens and M. hexagonalis. Mimetaster hexagonalis and Marrella have long been regarded as closely related (Stürmer & Bergström 1976;Bartels et al 1998;Kühl & Rust 2010).…”

Section: Box 2: the Faunasmentioning

confidence: 99%

The Fezouata fossils of Morocco; an extraordinary record of marine life in the Early Ordovician

Roy

Briggs

Gaines

2015

JGS

130

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The discovery of the Fezouata biota in the latest Tremadocian of southeastern Morocco has significantly changed our understanding of the early Phanerozoic radiation. The shelly fossil record shows a well-recognized pattern of macroevolutionary stasis between the Cambrian Explosion and the Great Ordovician Biodiversification Event, but the rich soft-bodied Fezouata biota paints a different evolutionary picture. The Fezouata assemblage includes a considerable component of Cambrian holdovers alongside a surprising number of crown group taxa previously unknown to have evolved by the Early Ordovician. Study of the Fezouata biota is in its early stages, and future discoveries will continue to enrich our view of the dynamics of the early Phanerozoic radiation and of the nature of the fossil record.Supplementary material:A complete faunal list is available at http://www.geolsoc.org.uk/SUP18843.

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The arthropodCheloniellon from the devonian hunsrück shale

Cited by 43 publications

References 8 publications

The morphology and affinities of Skania fragilis (Arthropoda) from the middle Cambrian Burgess Shale

The morphology and affinities of Skania fragilis (Arthropoda) from the middle Cambrian Burgess Shale

Studies of tooth implantation in fossil tetrapods using high-resolution X-radiography

The Fezouata fossils of Morocco; an extraordinary record of marine life in the Early Ordovician

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