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Streng, Michael
Publications (10 of 52) Show all publications
Streng, M., Ebbestad, J. O. & Berg-Madsen, V. (2017). Cambrian palaeoscolecids (Cycloneuralia) of southern Scandinavia. Papers in Palaeontology, 3(1), 21-48
Open this publication in new window or tab >>Cambrian palaeoscolecids (Cycloneuralia) of southern Scandinavia
2017 (English)In: Papers in Palaeontology, ISSN 2056-2802, Vol. 3, no 1, p. 21-48Article in journal (Refereed) Published
Abstract [en]

A previously undocumented diversity of Cambrian palaeoscolecids is described from localities in Sweden, Norway and Denmark. The material described here includes isolated sclerites as well as the first macroscopic specimens reported from the palaeocontinent Baltica. The sclerites are all of early middle Cambrian age (Ptychagnostus gibbus Biozone) and are assigned to at least four new species of Hadimopanella, two of which are formally introduced: H. incubo sp. nov. and H. oelandiana sp. nov. The two macroscopic specimens are of late early Cambrian (Ellipsocephalus lunatus Biozone) and early middle Cambrian age (Acadoparadoxides oelandicus Biozone), respectively. The early Cambrian specimen is described as Maotianshania? sp. and comprises an incomplete annulated trunk fragment which is uniformly covered with circular sclerites, indicative of the palaeoscolecid family Maotianshaniidae. This is the first record of this family outside China. The middle Cambrian specimen is almost complete and introduced as Wronascolex? johanssoni sp. nov. It is characterized by a previously undocumented distribution of its Hadimopanella-like sclerites which increase in size and change ornamentation from the anterior to the posterior end of the distinctly annulated trunk. The observed distribution pattern can explain the high variability of species of the sclerite-based genus Hadimopanella as well as the occurrence of rare morphotypes of Hadimopanella in otherwise rich samples. Available data on the ontogeny of palaeoscolecids regarding the relationship between body and sclerite size of a taxon are evaluated. It is concluded that sclerite size might be species specific and should be considered when comparing taxa with morphological similar sclerites.

National Category
Other Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-311368 (URN)10.1002/spp2.1067 (DOI)000397149200002 ()
Available from: 2016-12-26 Created: 2016-12-26 Last updated: 2018-09-07Bibliographically approved
Streng, M., Butler, A. D., Peel, J. S., Garwood, R. J. & Caron, J.-B. (2016). A new family of Cambrian rhynchonelliformean brachiopods (Order Naukatida) with an aberrant coral-like morphology. Palaeontology, 59(2), 269-293
Open this publication in new window or tab >>A new family of Cambrian rhynchonelliformean brachiopods (Order Naukatida) with an aberrant coral-like morphology
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2016 (English)In: Palaeontology, ISSN 0031-0239, E-ISSN 1475-4983, Vol. 59, no 2, p. 269-293Article in journal (Refereed) Published
Abstract [en]

Tomteluva perturbata gen. et sp. nov. and Nasakia thulensis gen. et sp. nov., two new rhynchonelliformean brachiopod taxa, are described from carbonate beds from the lower middle Cambrian (Series 3, Stage 5) basinal Stephen Formation, Canada, and the upper lower Cambrian (Series 2, Stage 4) Henson Gletscher Formation, North Greenland, respectively. The two taxa are characterized by an unusual coral-like morphology typified by a high conical ventral valve with an anteriorly curved umbo and a tube-like structure inside the ventral valve, interpreted as pedicle tube. Both resemble the problematic late middle Cambrian (Drumian) species Anomalocalyx cawoodi Brock from Australia, whose systematic affiliation is controversial. Together, the three genera are interpreted as representatives of a new family of rhynchonelliformean brachiopods, the Tomteluvidae fam. nov., which is interpreted as an aberrant or derived taxon within the Order Naukatida. Convergence between the Tomteluvidae and the coralla of small solitary Cambrian coralimorphs, as well as the late Palaeozoic reef-building richthofenioid brachiopods, might indicate adaptation to a similar life habits and environments. However, their small size (length 4 mm), well-developed pedicle and perfect morphological symmetry make it more likely that tomteluvids lived attached to frondose algae or sponges, above the seafloor, in a similar fashion to the acrotretoid brachiopods with which they show a high degree of morphological convergence. Morphological features of the pedicle tube of N. thulensis suggest that the tomteluvid pedicle is homologous to that in modern rhynchonelliformean brachiopods. This is the first evidence of the pedicle type within the Naukatida and represents the oldest confirmation of a rhynchonellate pedicle.

National Category
Other Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-261904 (URN)10.1111/pala.12226 (DOI)000370607400007 ()
Funder
Swedish Research Council, 621-2011-4961
Available from: 2015-09-05 Created: 2015-09-05 Last updated: 2017-12-04Bibliographically approved
Peel, J. S. & Streng, M. (2015). A new middle Cambrian bradoriid arthropod from Greenland and western Canada. Journal of Paleontology, 89(1), 96-102
Open this publication in new window or tab >>A new middle Cambrian bradoriid arthropod from Greenland and western Canada
2015 (English)In: Journal of Paleontology, ISSN 0022-3360, E-ISSN 1937-2337, Vol. 89, no 1, p. 96-102Article in journal (Refereed) Published
Abstract [en]

Circum-Laurentian middle Cambrian (Cambrian Series 3) deposits in Greenland and British Columbia yield a new hipponicharionid bradoriid arthropod, Flumenoglacies n. gen., characterized by a comarginal, ramp-like structure which is crested by a continuous lobe. The narrow lobe is the result of the medial fusion of anterior and posterior lobes, seemingly a recurrent theme in hipponicharionid evolution. The type species, F. groenlandica n. sp., is described from the Ekspedition Brae Formation (Drumian Stage) of Peary Land but the description of two unnamed species from slightly older middle Cambrian strata of the Stephen Formation of British Columbia provides additional evidence for the wide distribution of Small Shelly Faunas during the Cambrian.

National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-251860 (URN)10.1017/jpa.2014.8 (DOI)000351478500007 ()
Available from: 2015-04-24 Created: 2015-04-24 Last updated: 2017-12-04Bibliographically approved
Butler, A. D., Streng, M., Holmer, L. E. & Babcock, L. E. (2015). Exceptionally preserved Mickwitzia from the Indian Springs Lagerstätte (Cambrian Stage 3), Nevada. Journal of Paleontology, 89(6), 933-955
Open this publication in new window or tab >>Exceptionally preserved Mickwitzia from the Indian Springs Lagerstätte (Cambrian Stage 3), Nevada
2015 (English)In: Journal of Paleontology, ISSN 0022-3360, E-ISSN 1937-2337, Vol. 89, no 6, p. 933-955Article in journal (Refereed) Published
Abstract [en]

ABSTRACT Exceptionally preserved specimens of the Cambrian stem-group brachiopod Mickwitzia occidens Walcott, 1908 are described in detail from the Indian Springs LagerstÀtte in Nevada, USA. Shell structure and preserved mantle setae from these specimens reveal a variable diagenetic (taphonomic) history and provide insight into the phylogenetic position of mickwitziids. Morphologic and morphometric comparison to M. monilifera (Linnarsson, 1869) from Sweden and M. muralensis Walcott, 1913 from British Columbia, Canada reveals clear species-level distinctions. Scanning electron microscopic analysis allows revision of the generic diagnosis. The Mickwitzia shell is characterized by the presence of inwardly pointing phosphatic cones and tangential setae-bearing tubes. The inwardly pointing cone structures are not consistent with setal bearing structures as previously thought, but rather represent endopunctae-like structures. Acrotretid-like shell structures and shell-penetrating setae in M. occidens strengthen the previously proposed close relationship between stem-group brachiopods and tommotiids, a group of small shelly fossils.

National Category
Other Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-292864 (URN)10.1017/jpa.2016.8 (DOI)000376768500004 ()
Funder
Swedish Research Council, 2009-4395, 2012-1658
Available from: 2016-05-10 Created: 2016-05-10 Last updated: 2017-11-30Bibliographically approved
Caron, J.-B., Gaines, R., Aria, C., Mangano, G. & Streng, M. (2014). A new phyllopod bed-like assemblage from the Burgess Shale of the Canadian Rockies. Nature Communications, 5, 3210
Open this publication in new window or tab >>A new phyllopod bed-like assemblage from the Burgess Shale of the Canadian Rockies
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2014 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 5, p. 3210-Article in journal (Refereed) Published
Abstract [en]

Burgess Shale-type fossil assemblages provide the best evidence of the ‘Cambrian explosion’. Here we report the discovery of an extraordinary new soft-bodied fauna from the Burgess Shale. Despite its proximity (ca. 40km) to Walcott’s original locality, the Marble Canyon fossil assemblage is distinct, and offers new insights into the initial diversification of metazoans, their early morphological disparity, and the geographic ranges and longevity of many Cambrian taxa. The arthropod-dominated assemblage is remarkable for its high density and diversity of soft-bodied fossils, as well as for its large proportion of new species (22% of total diversity) and for the preservation of hitherto unreported anatomical features, including in the chordate Metaspriggina and the arthropod Mollisonia. The presence of the stem arthropods Misszhouia and Primicaris, previously known only from the early Cambrian of China, suggests that the palaeogeographic ranges and longevity of Burgess Shale taxa may be underestimated.

Keywords
Cambrian, Burgess Shale, exceptional preservation, Canada
National Category
Other Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-220903 (URN)10.1038/ncomms4210 (DOI)000332663500001 ()
Available from: 2014-03-23 Created: 2014-03-23 Last updated: 2017-12-05Bibliographically approved
Geyer, G., Peel, J. S., Streng, M., Voigt, S., Fischer, J. & Preusse, M. (2014). A remarkable Amgan (Middle Cambrian, Stage 5) fauna from the Sauk Tanga, Madygen region, Kyrgyzstan. Bulletin of Geosciences, 89(2), 375-400
Open this publication in new window or tab >>A remarkable Amgan (Middle Cambrian, Stage 5) fauna from the Sauk Tanga, Madygen region, Kyrgyzstan
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2014 (English)In: Bulletin of Geosciences, ISSN 1214-1119, E-ISSN 1802-8225, Vol. 89, no 2, p. 375-400Article in journal (Refereed) Published
Abstract [en]

Early Middle Cambrian bituminous coquinoid limestones from a tectonically isolated outcrop in southwestern Kyrgyzstan yield a remarkably diverse fauna, with stem-group cnidarians, trilobites, rhynchonelliformean brachiopods, and other shelly fossils. The fossil site is in the northern foothills of the Turkestan Range and thus forms part of the westernmost extension of the South Tien Shan. The fauna includes two fairly well known trilobite species, Glabrella ventrosa Lermontova, 1940 and Dorypyge richthofeniformis Lermontova, 1940, that provide confident support for an Amgan age of the rocks. New described taxa include the stem-group cnidarian Cambroctoconus kyrgyzstanicus Peel sp. nov., the trilobite Olenoides sagittatus Geyer sp. nov., and the helcionelloid Manasoconus bifrons Peel gen. et sp. nov. Additional fossils within the samples include the trilobites Olenoides sp. A, Kootenia sp., and Pseudoeteraspis? sp.; the rhynchonelliform brachiopods Narynella cf. ferganensis (Andreeva, 1962), Narynella? sp., Austrohedra? sp. nov., and two species of uncertain generic affinity; the tommotiid Tesella sp.; the hyolithelminth Hyolithellus sp.; and the palaeoscolecid Hadimopanella oezgueli Gedik, 1977. Of particular interest is Cambroctoconus kyrgyzstanicus with an octagonal corallum and a sparsely septate calyx.

Keywords
Middle Cambrian, Cnidaria, Mollusca, Trilobita, Brachiopoda, Tommotiida, Palaeoscolecida, Kyrgyzstan
National Category
Geosciences, Multidisciplinary Geology
Identifiers
urn:nbn:se:uu:diva-228516 (URN)10.3140/bull.geosci.1434 (DOI)000336622700016 ()
Available from: 2014-07-16 Created: 2014-07-16 Last updated: 2017-12-05Bibliographically approved
Kear, B. P., Streng, M. & Ebbestad, J. O. (2013). Carl Wiman's legacy: 100 years of Swedish palaeontology. GFF, 135(1), 1-2
Open this publication in new window or tab >>Carl Wiman's legacy: 100 years of Swedish palaeontology
2013 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 135, no 1, p. 1-2Article in journal, Editorial material (Other academic) Published
National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-206401 (URN)10.1080/11035897.2013.798096 (DOI)000321173200001 ()
Available from: 2013-08-30 Created: 2013-08-30 Last updated: 2017-12-06Bibliographically approved
Arvestål, E. & Streng, M. (2013). Cyrtograptids from the Telychian (upper Llandovery) of Kinnekulle Mountain, southern Sweden. GFF, 135(1), 45-56
Open this publication in new window or tab >>Cyrtograptids from the Telychian (upper Llandovery) of Kinnekulle Mountain, southern Sweden
2013 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 135, no 1, p. 45-56Article in journal (Refereed) Published
Abstract [en]

The late Llandovery graptolite fauna of the Retiolites Shales on Kinnekulle Mountain in the province of Västergötland has long been known but never illustrated or studied in detail. New collections of graptolites from an interval at the very top of the exposed succession confirm previous reports of cyrtograptids, which make the shales on Kinnekulle the youngest preserved Palaeozoic rocks in the area. The co-occurrence of Oktavites spiralis and Cyrtograptus lapworthi constrains the strata to the lower lapworthi Biozone of the upper Telychian. The associated graptolite fauna comprises numerous monograptids and Retiolites angustidens as well as Cyrtograptus kinnekullensis n. sp., characterised by its open coiling and the presence of a second-order cladium on the second thecal cladium. This early occurrence of a cyrtograptid species with a second-order cladium on Baltica matches evolutionary patterns observed in Laurentia, suggesting that the ability to grow cladia of both first and higher order evolved approximately, synchronously and at the very beginning of cyrtograptid evolution.

Keywords
Cyrtograptus, Graptoloidea, Llandovery, Telychian, Kinnekulle, Västergötland.
National Category
Other Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-220901 (URN)10.1080/11035897.2013.779320 (DOI)
Available from: 2014-03-23 Created: 2014-03-23 Last updated: 2017-12-05Bibliographically approved
Butler, A., Streng, M., Garwood, R., Lowe, T. & Holmer, L. (2012). Constructing Cambrian body-plans: critical evaluation of tommotiid and stem-brachiopod character homologies. Paper presented at 56th Palaeontological Association Annual Meeting, University College Dublin.
Open this publication in new window or tab >>Constructing Cambrian body-plans: critical evaluation of tommotiid and stem-brachiopod character homologies
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2012 (English)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Other Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-190736 (URN)
Conference
56th Palaeontological Association Annual Meeting, University College Dublin
Funder
Swedish Research Council, 2011-4961
Available from: 2013-01-08 Created: 2013-01-08
Arvestål, E. & Streng, M. (2012). Cyrtograptids from the Telychian (upper Llandovery) of Kinnekulle Mountain, southern Sweden. Paper presented at 56th Palaeontological Association Annual Meeting, University College Dublin.
Open this publication in new window or tab >>Cyrtograptids from the Telychian (upper Llandovery) of Kinnekulle Mountain, southern Sweden
2012 (English)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Other Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-190747 (URN)
Conference
56th Palaeontological Association Annual Meeting, University College Dublin
Available from: 2013-01-08 Created: 2013-01-08
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