Middle Cambrian trilobites from the Ekspedition Bræ Formation of North Greenland, with a reappraisal of the genus<i>Elrathina</i>

Geyer, Gerd; Peel, John S.

doi:10.1017/jpa.2016.152

Cited by 20 publications

(33 citation statements)

References 38 publications

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“…We follow Naimark (2012) and Geyer & Peel (2017) in assigning the species formerly known as ‘ Peronopsis ’ interstricta to the genus Itagnostus . The affinities of agnostines (i.e.…”

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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“…We follow Naimark (2012) and Geyer & Peel (2017) in assigning the species formerly known as ‘ Peronopsis ’ interstricta to the genus Itagnostus . The affinities of agnostines (i.e.…”

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 age of the Ekspedition Brae Formation was discussed by Geyer & Peel (2017). Robison, R.A. (written communication 1987, cited by Peel & Streng 2015 dated the current samples to the Ptychagnostus atavus Biozone, the basal zone of the Drumian Stage (Cambrian Series 3, Stage 6), equivalent to the lower part of the Bolaspidella Biozone of the American standard (Babcock et al 2007).…”

Section: Methodsmentioning

confidence: 99%

An epiphytacean-Girvanella (Cyanobacteria) symbiosis from the Cambrian (Series 3, Drumian) of North Greenland (Laurentia)

Peel¹

2018

Bull. Geosci.

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The widespread Cambrian calcareous cyanobacterium Girvanella is described in symbiotic association with a new epiphytacean, Orpikania freucheni gen. et sp. nov. (Microproblematica), from the Ekspedition Brae Formation (Cambrian Series 3, Drumian Stage) of Freuchen Land, North Greenland. The phosphatized assemblages preserve dendrites of the epiphytacean forming a supporting framework for discrete climbing filaments of Girvanella lianiformis sp. nov. that are firmly attached to their host with holdfasts. Elevation of the slender Girvanella filaments on the framework of the dendrite potentially enhanced their phototactic movement towards the light. Filaments in the cooccurring Girvanella pituutaq sp. nov. are regularly twisted together into a ropelike form which may have assisted elevation above its substrate. •

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“…R.A. Robison (written communication 1987, cited by Peel & Streng 2015 dated the current samples to the Ptychagnostus atavus Biozone, the basal zone of the Drumian Stage (Miaolingian Series; Fig. 2), equivalent to the lower part of the Bolaspidella Biozone, but see discussion by Geyer & Peel (2017).…”

Section: Ekspedition Brae Formationmentioning

confidence: 99%

Sponge spicule assemblages from the Cambrian (Series 2–3) of North Greenland (Laurentia): systematics and biogeography

Peel

2019

GFF

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Isolated microscopic spicules from disarticulated scleritomes demonstrate the presence of a diverse sponge fauna otherwise not evident from the macrofossil record in carbonate successions deposited during the unnamed Cambrian Series 2 and Cambrian Series 3 (Miaolingian) in North Greenland. Most of the spicule morphotypes are not recognised from faunas of articulated sponges known from contemporaneous siliciclastic strata elsewhere. Assemblages are described in terms of four Cambrian stages and contain numerous spicule morphotypes not previously recorded from Laurentia. Many of the spicules can be correlated worldwide, however, extending current knowledge of the biogeographic distribution of sponge spicule-based taxa in the Cambrian. In particular, similar Cambrian Stage 4 (Series 2) and Miaolingian assemblages (Wuliuan, Drumian and Guzhangian stages) faunas are recorded from tropical palaeolatitudes in Australia, South China, Siberia and Laurentia, although this may in part reflect a methodology focused on the preparation of the carbonate samples that dominate these successions. New spicule-based taxa: Eiffelia floriformis n. sp., Australispongia? inuak n. sp., Celtispongia dorte n. gen. n. sp., Sanningasoqia borealis n. gen. n. sp., Speciosuspongia inughuitorum n. sp., Sulukispicula gelidae n. gen. n. sp.

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Middle Cambrian trilobites from the Ekspedition Bræ Formation of North Greenland, with a reappraisal of the genusElrathina

Cited by 20 publications

References 38 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

An epiphytacean-Girvanella (Cyanobacteria) symbiosis from the Cambrian (Series 3, Drumian) of North Greenland (Laurentia)

Sponge spicule assemblages from the Cambrian (Series 2–3) of North Greenland (Laurentia): systematics and biogeography

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