uu.seUppsala University Publications
Change search
Link to record
Permanent link

Direct link
BETA
Peel, John Stuart
Alternative names
Publications (10 of 65) Show all publications
Peel, J. S. (2020). Polypleuraspis (Arthropoda, Trilobita) from the middle Cambrian (Miaolingian Series) around Kane Basin (Nunavut and Greenland). Canadian journal of earth sciences (Print), 57(1), 16-24
Open this publication in new window or tab >>Polypleuraspis (Arthropoda, Trilobita) from the middle Cambrian (Miaolingian Series) around Kane Basin (Nunavut and Greenland)
2020 (English)In: Canadian journal of earth sciences (Print), ISSN 0008-4077, E-ISSN 1480-3313, Vol. 57, no 1, p. 16-24Article in journal (Refereed) Published
Abstract [en]

Polypleuraspis Poulsen, 1927, originally established on the basis of a single trilobite pygidium from the Cape Wood Formation of Inglefield Land, northwestern Greenland, is redescribed on the basis of material from additional occurrences in the Cape Wood and Telt Bugt formations exposed around Kane Basin in Ellesmere Island (Nunavut) and northern and northwestern Greenland. Polypleuraspis occurs together with Glossopleura Poulsen, 1927 in the Glossopleura wakotti Poulsen, 1927 Biozone of the Delamaran Stage of North American (Laurentian) usage, in middle Cambrian strata (Miaolingian Series) of the Wulivan Stage. The type species, Polypleuraspis solitaria Poulsen, 1927, is compared with Polypleuraspis insignis Rasetti, 1951 from the Stephen Formation (Burgess Shale Formation) of British Columbia and to a new species from the Telt Bugt Formation of Daugaard-Jensen Land: Polypleuraspis glacialis sp. nov. Polypleuraspis cooperi Robison and Babcock, 2011, from the Spence Shale of Utah of similar age, is assigned to Polypleuraspidella gen. nov.

Place, publisher, year, edition, pages
CANADIAN SCIENCE PUBLISHING, 2020
Keywords
trilobites, Greenland, Canada, systematics, Miaolingian
National Category
Geology
Identifiers
urn:nbn:se:uu:diva-403246 (URN)10.1139/cjes-2019-0011 (DOI)000505672300002 ()
Available from: 2020-01-28 Created: 2020-01-28 Last updated: 2020-01-28Bibliographically approved
Peel, J. S. (2019). Bobellis oliveri gen. et sp. nov. from the Silurian of North Greenland (Laurentia) and the systematic position of pycnomphaline gastropods. Bulletin of Geosciences, 94(2), 125-136
Open this publication in new window or tab >>Bobellis oliveri gen. et sp. nov. from the Silurian of North Greenland (Laurentia) and the systematic position of pycnomphaline gastropods
2019 (English)In: Bulletin of Geosciences, ISSN 1214-1119, E-ISSN 1802-8225, Vol. 94, no 2, p. 125-136Article in journal (Refereed) Published
Abstract [en]

The gastropod Bobellis oliveri gen. et sp. nov. is described from carbonate mounds of the Samuelsen Hoj Formation (early Silurian) within the Washington Land Group of North Greenland (Laurentia). It displays a profound adapertural swing of the growth lines across the upper whorl surface in the multi-whorled trochiform shell; the umbilicus is closed by a prominent funicle. Bobellis oliveri is assigned to the Family Pycnomphalidae (Ordovician-Devonian; nom. transl. Subfamily Pycnomphalinae Peel, 1984) which is transferred to the Euomphaloidea, alongside the morphologically similar Omphalotrochidae (Devonian-Permian). In pycnomphalids the umbilicus is usually partially or completely closed by a prominent circumbilical funicle while the umbilicus of omphalotrochids is generally open.

Place, publisher, year, edition, pages
CZECH GEOLOGICAL SURVEY, 2019
Keywords
Silurian, North Greenland, Laurentia, Gastropoda, Pycnomphalidae
National Category
Geology
Identifiers
urn:nbn:se:uu:diva-389991 (URN)10.3140/bull.geosci.1743 (DOI)000471678400001 ()
Available from: 2019-08-02 Created: 2019-08-02 Last updated: 2019-08-02Bibliographically approved
Peel, J. S. (2019). Muscle scars in euomphaline gastropods from the Ordovician of Baltica. Estonian journal of earth sciences, 68(2), 88-100
Open this publication in new window or tab >>Muscle scars in euomphaline gastropods from the Ordovician of Baltica
2019 (English)In: Estonian journal of earth sciences, ISSN 1736-4728, E-ISSN 1736-7557, Vol. 68, no 2, p. 88-100Article in journal (Refereed) Published
Abstract [en]

A discrete pair of muscle scars is described for the first time on the umbilical wall of the open-coiled, hyperstrophic ophiletoidean gastropod Asgardispira, a close relative of the widely distributed Lytospira, from the middle Ordovician of the eastern Baltica. In a unique specimen of the euomphaloidean Lesueurilla of similar age and derivation, the muscles have coalesced into a single scar. A pair of pedal retractor muscles is characteristic of several major groups of gastropods both in the Lower Palaeozoic and at the present day, and was likely an ancestral character of the class. The consolidation of muscle attachment to a single site may reflect the tightening of the logarithmic spiral of the shell and is probably related to the increasing development of anisostrophic coiling and shell re-orientation during gastropod evolution.

Place, publisher, year, edition, pages
ESTONIAN ACAD PUBLISHERS, 2019
Keywords
gastropods, muscle scars, Ordovician, Baltica
National Category
Geology
Identifiers
urn:nbn:se:uu:diva-389987 (URN)10.3176/earth.2019.08 (DOI)000471825400003 ()
Available from: 2019-08-02 Created: 2019-08-02 Last updated: 2019-08-02Bibliographically approved
Peel, J. S. (2019). Ordovician gastropods from pebbles in Cretaceous fluvial sandstones in south-east Disko, West Greenland. Bulletin of the Geological Society of Denmark, 67, 75-81
Open this publication in new window or tab >>Ordovician gastropods from pebbles in Cretaceous fluvial sandstones in south-east Disko, West Greenland
2019 (English)In: Bulletin of the Geological Society of Denmark, ISSN 0011-6297, E-ISSN 2245-7070, Vol. 67, p. 75-81Article in journal (Refereed) Published
Abstract [en]

The gastropods Sinuopea sp. and Lecanospira cf. compacta (Salter 1859) of probable early Ordovician age are described from cherty limestone clasts within fluvial strata of the Cretaceous Atane Formation of south-east Disko, central West Greenland. The record of Sinuopea possibly suggests an earliest Ordovician (Tremadocian) age, slightly older than the Floian-Dapingian age suggested by the oldest known conodont assemblages described from West Greenland. The determinations provide supporting evidence for a former periodic cover of Ordovician strata in the Archaean terrane of south western Greenland, extending deep into the heart of the Laurentian landmass.

Keywords
Greenland, Disko, Cretaceous lags, Atane Formation, Ordovician gastropods
National Category
Geology
Identifiers
urn:nbn:se:uu:diva-396563 (URN)000490595200001 ()
Available from: 2019-11-06 Created: 2019-11-06 Last updated: 2019-11-06Bibliographically approved
Peel, J. S. (2019). Sponge spicule assemblages from the Cambrian (Series 2?3) of North Greenland (Laurentia): systematics and biogeography. GFF, 141(2), 133-161
Open this publication in new window or tab >>Sponge spicule assemblages from the Cambrian (Series 2?3) of North Greenland (Laurentia): systematics and biogeography
2019 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 141, no 2, p. 133-161Article in journal (Refereed) Published
Abstract [en]

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 un-named 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.

Keywords
Cambrian (Series 2?3), Miaolingian, sponge spicules, systematics, biogeography, North Greenland, Laurentia
National Category
Geology
Identifiers
urn:nbn:se:uu:diva-396562 (URN)10.1080/11035897.2019.1578261 (DOI)000488960900005 ()
Available from: 2019-11-06 Created: 2019-11-06 Last updated: 2019-11-06Bibliographically approved
Peel, J. S. (2019). Tarimspira from the Cambrian (Series 2, Stage 4) of Laurentia (Greenland): extending the skeletal record of paraconodontid vertebrates. Journal of Paleontology, 93(1), 115-125
Open this publication in new window or tab >>Tarimspira from the Cambrian (Series 2, Stage 4) of Laurentia (Greenland): extending the skeletal record of paraconodontid vertebrates
2019 (English)In: Journal of Paleontology, ISSN 0022-3360, E-ISSN 1937-2337, Vol. 93, no 1, p. 115-125Article in journal (Refereed) Published
Abstract [en]

Phosphatic sclerites of the problematic Tarimspira Yue and Gao, 1992 (Cambrian Series 2) recovered by weak acid maceration of limestones display a unique range of mainly strongly coiled morphologies. They were likely organized into multielement scleritomes, but the nature of these is poorly known; some sclerites may have had a grasping function. Tarimspira sclerites grew by basal accretion in an analogous fashion to younger paraconodonts (Cambrian Series 3-4) but lack a basal cavity. Based on proposed homologies, Tarimspira may provide an extension of the early vertebrate paraconodont-euconodont clade back into the early Cambrian. Tarimspira is described for the first time from Laurentia (North Greenland), extending its known range from China and Siberia in Cambrian Series 2. In addition to the type species, Tarimspira plana Yue and Gao, 1992, the Greenland record of Tarimspira includes two morphotypes of a new species, Tarimspira artemi.

National Category
Geology
Identifiers
urn:nbn:se:uu:diva-375843 (URN)10.1017/jpa.2018.68 (DOI)000455719500008 ()
Available from: 2019-02-01 Created: 2019-02-01 Last updated: 2019-02-01Bibliographically approved
Peel, J. S., Willman, S. & Schack Pedersen, S. (2019). Unusual preservation of an Ordovician (Floian) arthropod from Peary Land, North Greenland (Laurentia). Palaeontologische Zeitschrift
Open this publication in new window or tab >>Unusual preservation of an Ordovician (Floian) arthropod from Peary Land, North Greenland (Laurentia)
2019 (English)In: Palaeontologische Zeitschrift, ISSN 0031-0220, E-ISSN 1867-6812Article in journal (Refereed) Epub ahead of print
Abstract [en]

Preservation of a fragment of an arthropod from starved trough sediments of the Bøggild Fjord Formation (Ordovician, Floian) of Johannes V. Jensen Land in north Peary Land, North Greenland, recalls that of the lower Cambrian Sirius Passet Lagerstätte of extreme north-west Peary Land and may suggest a second locality for exceptional preservation in North Greenland. A prominent petaloid pattern on the tergopleurae reflects impression onto the internal mould of terrace lines from the cuticle exterior. The arthropod is associated with poorly preserved sponges and a depauperate assemblage of organic-walled microfossils. It is tentatively compared to Mollisonia, originally described from the Burgess Shale Lagerstätte (middle Cambrian, Miaolingian Series) of Canada.

National Category
Other Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-390137 (URN)10.1007/s12542-019-00481-y (DOI)
Available from: 2019-08-05 Created: 2019-08-05 Last updated: 2019-08-16Bibliographically approved
Peel, J. S. (2018). A new look at Pleurotomaria perlata Hall, 1852 (Gastropoda) from the Silurian of Laurentia. GFF, 140(3), 249-253
Open this publication in new window or tab >>A new look at Pleurotomaria perlata Hall, 1852 (Gastropoda) from the Silurian of Laurentia
2018 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 140, no 3, p. 249-253Article in journal (Refereed) Published
Abstract [en]

New material from Genoa, Ohio, USA, of the distinctive but poorly known Silurian gastropod Pleurotomaria perlata Hall, 1852, originally described from the Guelph Formation of Ontario, Canada, demonstrates that it is not a pleurotomariinid vetigastropod. It is a species of Isfarispira Gubanov, Peel & Pianovskaya, 1995, first described from the Silurian of Kyrgyzstan, central Asia, and now recognised from Laurentia. Isfarispira belongs within a pycnomphaline-omphalotrochid group of euomphaloidean gastropods but this group is too poorly understood to allow firm placement at this time.

Place, publisher, year, edition, pages
TAYLOR & FRANCIS LTD, 2018
Keywords
Gastropoda, Silurian, Laurentia, systematics
National Category
Geology
Identifiers
urn:nbn:se:uu:diva-365845 (URN)10.1080/11035897.2018.1482564 (DOI)000444255500003 ()
Available from: 2018-11-15 Created: 2018-11-15 Last updated: 2018-11-15Bibliographically approved
Peel, J. S. (2018). An epiphytacean-Girvanella (Cyanobacteria) symbiosis from the Cambrian (Series 3; Drumian) of North Greenland (Laurentia). Bulletin of Geosciences, 93(3), 327-336
Open this publication in new window or tab >>An epiphytacean-Girvanella (Cyanobacteria) symbiosis from the Cambrian (Series 3; Drumian) of North Greenland (Laurentia)
2018 (English)In: Bulletin of Geosciences, ISSN 1214-1119, E-ISSN 1802-8225, Vol. 93, no 3, p. 327-336Article in journal (Refereed) Published
Abstract [en]

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 Bra; 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 lianifiomis 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 co-occurring Girvanella pituutaq sp. nov. are regularly twisted together into a nape-like form which may have assisted elevation above its substrate.

Place, publisher, year, edition, pages
CZECH GEOLOGICAL SURVEY, 2018
Keywords
Cambrian, Drumian, Cyanobacteria, epiphytacean, symbiosis, North Greenland
National Category
Geology
Identifiers
urn:nbn:se:uu:diva-364023 (URN)10.3140/bull.geosci.1705 (DOI)000441904600004 ()
Available from: 2018-10-23 Created: 2018-10-23 Last updated: 2018-10-23Bibliographically approved
Lerosey-Aubril, R. & Peel, J. S. (2018). Gut Evolution In Early Cambrian Trilobites And The Origin Of Predation On Infaunal Macroinvertebrates: Evidence From Muscle Scars In Mesolenellus. Palaeontology, 61(5), 747-760
Open this publication in new window or tab >>Gut Evolution In Early Cambrian Trilobites And The Origin Of Predation On Infaunal Macroinvertebrates: Evidence From Muscle Scars In Mesolenellus
2018 (English)In: Palaeontology, ISSN 0031-0239, E-ISSN 1475-4983, Vol. 61, no 5, p. 747-760Article in journal (Refereed) Published
Abstract [en]

Trilobites are particularly common Cambrian fossils, but their trophic impact on the rapidly evolving marine ecosystems of that time is difficult to assess, due to uncertainties on how diverse their feeding habits truly were. Gut anatomy might help to constrain inferences on trilobite feeding ecology, but preservation of digestive organs is exceedingly rare. Muscle scars on the glabella, known as 'frontal auxiliary impressions' (FAIs), have been interpreted as evidence of the evolution of a pouch-like organ with powerful extrinsic muscles (i.e. a crop) in some trilobites. Here we describe FAIs in Mesolenellus hyperboreus from Cambrian Stage 4 strata of North Greenland, which represents the oldest example of such structures and their first report in the Suborder Olenellina. Mesolenellus FAIs suggest that the crop in trilobites was clearly differentiated from the rest of the digestive tract, and essentially located under a hypertrophied glabellar frontal lobe. Reviews of the digestive anatomy of trilobite sister-taxa and the glabellar morphology of the oldest-known trilobites suggest that the gut of the trilobite ancestor was an essentially simple tract (i.e. no well-differentiated crop) flanked laterally by numerous midgut glands. A crop first evolved in the Cambrian in groups like olenelloids and (later) paradoxidoids. Using ichnological evidence, we hypothesize that the emergence of olenelloids yields evidence for the evolution of predatory inclinations in a group of arthropods originally dominated by surfacedeposit-feeders. By allowing the exploitation of a rapidly developing food source, infaunal animals, the diversification of feeding strategies in trilobites might partially explain their unparalleled evolutionary success.

Keywords
Trilobita, Olenellina, muscle scars, digestive system, feeding strategy, Buen Formation
National Category
Geology
Identifiers
urn:nbn:se:uu:diva-364198 (URN)10.1111/pala.12365 (DOI)000440682800007 ()
Available from: 2018-10-29 Created: 2018-10-29 Last updated: 2018-11-16Bibliographically approved
Organisations

Search in DiVA

Show all publications